QUESTION BANK

S6 EEE

EE 302 ELECTROMAGNETICS (S6 EEE)

Sl No.

QUESTION Marks

MODULE 1

1 Obtain gradient of the functions:

5 KTU April

2018

2 Given two points, C(-3,2,1) and D(r=5,θ=200,ϕ=-700). Find a) the spherical coordinates of C

b) rectangular coordinates of D c) distance from C to D

10

3 Explain about the physical significance of divergence of vector quantity. 5 KTU

April

2018

4 Explain about the cylindrical coordinate system. 3 KTU

April

2018

Find the gradient of scalar function in cylindrical

coordinates and the directional derivative of the function in the

direction of the vector at the point (2, π/4, 0).

7 KTU April

2018

5 Explain about the conservative field. 2 KTU

April

2018

Determine the divergence of vector field

8 KTU April

2018

6 Find the divergence of A where, A z sina 3z 2 cosa

5 KTU

MAY

2019

7 a) State and Prove Stoke’s Theorem b) What is Curl of a vector field? Explain its physical significance.

5+5

KTU

MAY 2019

8 a) Explain the concept of electric potential and potential gradient.

b) Explain spherical co-ordinate system.

5+5 KTU

MAY

2019

MODULE 2

1 Derive the expression of electric field intensity due to sheet charge

having surface charge density σs C/m2

5 KTU

April

2018

2 Three concentrated charges of 0.25 μ C are located at the vertices of an equilateral triangle of 10 cm side. Find the magnitude and

10

direction of the force on one charge due to other two charges.

3 Explain about energy densities in electric and magnetic fields. 5 KTU

April

2018

4 Obtain the expression of electric field due to different charge bodies. 5 KTU

April

2018

5 Derive the expression for electric field intensity of an electric dipole. 10

6 Write a note on poisson’s equation and laplace’s equation 5

7 A circular of radius ‘a’ meter is charged uniformly with a charge density ρs

c/m2.Find the electric field at a point ‘h’ meter from the disc along its axis.

10

8 a) State and Prove Gauss’s law.

b) Apply Gauss’s law to find the expression for Electric field Intensity

and

Electric flux density due an infinite line charge distribution.

5+5 KTU-

MAY

2019

9 Define equipotential surface? 5 KTU-

MAY

2019

MODULE 3

1 State and explain Ampere’s circuit law. 3 KTU

April

2018

A current filament carries a current of 10 A in the az direction on the z axis.

Find in rectangular system at point P(1,2,3) due to this filament if it extends from a)z = -∞ to +∞ b) 5 to ∞.

7 KTU April

2018

2 Explain Biot-Savart Law. 5 KTU-MAY 2019

3 a) Apply Biot-Savart law and determine an expression for magnetic field

intensity at a point due to an infinitely long straight conductor carrying

current I.

b) Explain continuity equation for current.

7+3 KTU-MAY 2019

4 A circular loop consists of 25 turns of very fine wire. The average radius of

the loop is 20 cm and it carries a current of 1.6 A. Find the magnetic flux density at the centre of the loop along axial direction.

10

5 Define magnetic vector potential 5

6 a) State Ampere’s circuital law and explain any one application of Ampere’s circuital law b) Derive the boundary conditions with respect to the electric field at the interface of a dielectric – dielectric boundary

5+5

7 Formulate the magnetic field intensity on the axis of a circular loop carrying current.

10

8 Derive the expression for magnetic field intensity due an infinite wire carrying current.

10

MODULE 4

1 Discuss about inconsistency of Ampere’s law and Displacement current density

5

2 Find the magnetic flux crossing the portion of the conductor in the plane

defined by for a current of 2 A.

5 KTU April

2018

3 Derive the expression of inductance of solenoid having N turns. Explain the electric boundary conditions of two dielectric media.

6+ 4

KTU

April

2018

4 A) Formulate the Maxwell’s equation in differential form and point form in phasor form B) Explain the continuity equation

7+ 3

KTU April 2018

5 Explain the self-inductance associated with magnetic fields & prove that maximum energy stored in magnetic field is proportional to the self-inductance.

5

6 a) Derive an expression for energy stored in an electrostatic field in terms of electric flux density. b) What is electric polarisation? Explain.

7+3 KTU-MAY 2019

7 Derive Maxwell’s equations in differential and integral form from Faraday’s Law

5 KTU-MAY 2019

MODULE - 5

8 Differentiate conduction current and displacement current densities 10

1 Explain about Poynting theorem. 5 KTU

April

2018

2 A 9375 MHz uniform plane wave is propagating in polystyrene. If the

amplitude of the electric field intensity is 20 V/m and the

material is assumed to be loss less find α, β, λ, intrinsic impedance,

propagation constant and amplitude of H.

5 KTU April

2018

3 Explain the power flow in a co-axial cable. 10

4 Derive wave equation from Maxwell’s equation. 5

5 Formulate wave equation in phasor form. 10

6 Explain complex averaging pointing vector 5

7 What are uniform plane waves? 10

8 Explain the wave propagation in good dielectric with necessary equation.

10

MODULE-6

1 Derive and Explain Uniform plane wave equation 5 KTU

April

2018

2 Define a) intrinsic impedance b) characteristic impedance 5 KTU

April

2018

3 Write down the expression of transmission line parameters 5 KTU

April

2018

4 What is skin depth? 3 KTU

April

2018

Show that the power flow along a concentric cable is the product of voltage

and current using Poynting Theorem

7 KTU

April

2018

5 Explain group velocity and phase velocity. 5 KTU

April

2018

6 Derive the attenuation constant and phase shift constant for a perfect

conductor

5 KTU

April

2018

7 Explain about electromagnetic interference. 5 KTU

April

2018

EE304 ADVANCED CONTROL THEORY (S6 EEE)

Sl

No.

Questions Marks KU/KTU

(Month/Year)

1 Explain the effects of adding PID controller to a system. 5 KTU April

2018

2 What is a lag compensator? Draw its pole-zero plot and the

frequency response characteristics.

5 KTU April

2018

3 Write the design steps of lead compensator based on frequency

domain approach.

4 KTU

2018

April

4 Write the transfer function of PID controller. 5 KTU

December

2019

5 Compare the effects of P, PI and PID controllers on the closed loop

system performance in terms of rise time, peak overshoot, settling

time, steady state error and stability.

5 KTU

2019

May

6 Obtain the transfer function of a lead compensator with the help

of an electrical network.

5 KTU

December

2019

7 What are the effects of Lag and Lead compensators on the

system performance?

5 KTU

2019

May

8 Write the transfer function of lead compensator and draw its pole zero plot

10

9 For a feedback system shown in Fig. 2, design suitable compensator

so that phase margin is 40° and steady state error for ramp input ≤ 0.2

5 KTU

2018,

2019

April

May

10 What is meant by series compensation and feedback

compensation in control systems?

6 KTU May

2019

Sl No.

Questions

Marks KU/KTU

(Month/Year)

1 Design a suitable compensator for the system with open-loop transfer 10 KTU April

function 2018

April

so that the over shoot to a unit step input to be limited to 20% and the

transient to be settled with in 3s.

2 How root loci are modified when pole is added to open loop

transfer function of system

5

3 Discuss the effect of adding a pole to open loop transfer function

of a system

5

4 How root loci are modified when zero is added to open loop

transfer function of system

5

5 What is PID controller? What are its effect on system performance? 10

6 Briefly explain Ziegler – Nichol’s PID tuning rules. 6 KTU 2018,

2019

A

p

r

i

l

M

a

y

7 Write the transfer function of PID controller 5

8 Design a lead compensator for a unity feedback system with open

loop transfer function G(S) = K/[S(S+8)] to satisfy the following

specifications. (1) Percentage overshoot = 9.5% (2) Natural

frequency of oscillation=12 rad/sec (3) Velocity error constant ≥ 10.

10 KTU May,

December

2019

Sl No.

Questions Marks KU/KTU

(Month/Year)

1 Find the complete response of the system

where u(t) is the unit step input.

10 KTU April

2018

2 Selecting i1(t) =x1(t) and i2(t) =x2(t)as sate variables obtain state

equation and

output equation of the network shown in Fig.1

5 KTU April

2018

3 Transform the system in to controllable canonical form

7 KTU April

2018

4 Write the properties of state transition matrix? 4 KU May

2009

5 Derive a relation between state equation and transfer function for LTI

system

5 KTU

December

2019

6

Explain the terms (i) state (ii) state variables (iii) state vector (iv) state

space (v) state trajectory of a system.

5 KTU May

2019

7 Derive the state model of an R-L-C series circuit 3 KTU May

2019

8 Show that eigen values of A matrix corresponding to a system with

transfer function G(S) is same as its poles

5 KU Nov

2010

Sl

No.

Questions

Marks

KU/KTU

(Month/Year)

1 Consider a linear system described by the transfer function Y(s)/U(s) =10/[S(S+1)(S+2)]. Design a feedback controller with a state feedback so

that the closed loop poles are placed at -2, -1±j1.

7 KTU

May

2019

2 Consider a system defined by

Using state feedback control u=−Kx, it is desired to have the closed loop

poles at s = −3 and , s =−4, determine the state feedback gain matrix K.

7 KTU

April

2018

3 What is pulse transfer function? 3 KTU

April

2018

4 Check the stability of the sampled data control system shown below

z3-0.2z2-0.25z+0.05=0

4 KTU

May

2019

5 State and explain sampling theorem 5 KTU

April

2018

6 Determine the pulse transfer function of the discrete time control system

shown in figure for a sampling time of T=1 sec. Also find the response to

unit step input. The transfer function of the system is G(s) = 1/(s+1).

10 KTU

May

2019

7 What is pulse transfer function? Derive the transfer function of a ZOH

circuit.

5 KTU

May

2019

8 Define controllability and observability of a system and check whether the

system (𝑠)(𝑠)=1(𝑠+1)(𝑠+2) is controllable or not.

6 KTU

May

2019

9 The characteristic polynomial of certain sampled data system is given by

P(z) = z4- 1.2z3+ 0.07z2+ 0.3z - 0.08 = 0, test the stability of the system

using Jury’s stability test.

5 KTU

April

2018

10 Define controllability. Explain with a suitable example, how can we check

the controllability of a system.

5 KTU

Decembe

r 2019

Sl No.

Questions Marks KU/KTU

(Month/Year)

1 Explain different non linearities with diagram. 5 KTU April

2018

2 Explain frequency amplitude dependency of nonlinear system 5 KU May

2012

3 Explain saturation and dead zone nonlinearities associated with non linear

system

6 KU May

2012

4 Consider a unity feedback system shown in figure having a saturating

amplifier with a gain K. Determine the maximum value of K for the

system to be stable. What would be the frequency and nature of limit

cycle for a gain of K=2.5?

10 KTU May

2019

5 Derive the Describing function of saturation with Dead-zone nonlinearity. 10 KTU May

2019

6 Differentiates between incidental and intentional non linearity 5 KU May

2012

7 Write the concept of describing function method 5 KU May

2012

8 State any five characteristics of Nonlinear systems. 5 KTU May

2019

9 Define Describing function. Explain how describing function can be

used for stability analysis of nonlinear systems.

5 KTU May

2019

10 A common form of an electronic oscillator is represented as shown in Fig.

3. For what value of K, the possibility of limit cycle predicted? If K=3,

10 KTU April

2018

determine amplitude and frequency of limit cycle. Also find the maximum

value of K for the system is stable.

11 Obtain the describing function of saturation non-linearity. 10 KTU April

2018

Sl No. Questions Marks KU/KTU

(Month/Year)

1 Explain Liapunov second method of stability for nonlinear systems. 5 KTU May

2019

2 What is phase plane analysis? How is it used for analysis non linear

systems

5 KU May

2012

3 Determine whether the following function is positive definite or not

Q=X12+2X22+3X32+2X1X22+20X1X3

5 KU May

2011

4 A linear second order system is described by the equation

�̈�+2𝛿𝜔𝑛�̇�+𝜔𝑛2e=0 where 𝛿=0.15, 𝜔𝑛=1rad/sec, e(0)=1.5, and �̇�(0)=0.

Determine the singular point and state the stability by constructing the

phase trajectory using the method of isoclines.

10 KTU May

2019

5 Define Singular point. Explain the nature of Eigen values of system

matrix for any five types of singular points.

5 KTU May

2019

6 With help of neat diagrams distinguish local stability and asymptotic

stability

10 KU Nov

2010

7 Determine given quadratic form is positive definite or not

5 KTU April

2018

8 A second order system is represented by

Assuming matrix Q to be identity matrix, solve for matrix P in the equation

ATP+PA = −Q. Use Lyapunov theorem and determine the stability of the

system. Write the Lyapunov function V(x)

10 KTU April

2018

9 What is limit cycle? How will you determine stable and unstable limit

cycle using phase portrait?

5 KTU April

2018

10 What are singular point? Explain the types of singular point. 5 KTU April

2018

Subject: Power System Analysis (EE 306) S6 EEE

Sl No. Question Marks

Module 1

1

A 120 MVA, 19.5 kV generator has X = 1.5 percent and is

connected to a transmission line by a star-delta transformer rated

150 MVA, 230/18 kV with X = 0.1 percent. If the base to be used

in the calculations is 100 MVA, 230kV for the transmission line,

find the per unit values to be used for the transformer and

generator reactance.

5

KTU

(April

2018)

2 Classify the various types of buses in a power system for load flow

studies.

5 KTU

(April

2018)

3 Find the expression for three phase power in terms of symmetrical

components.

4 KTU

(April

2018)

4 A synchronous generator and motor are rated 30MVA, 13.2kV

and both have sub-transient reactance of 20%. The line connecting

them has a reactance of 10% on the base of the machine ratings.

The motor is drawing 20,00okW at 0.85 power factor lagging at a

terminal voltage of 12.8 kV when a symmetrical three phase fault

occurs at the motor terminals. Find the sub-transient current in the

generator, motor and fault.

10

KTU

(April

2018)

5 Obtain the symmetrical components of the following set of

unbalanced currents

Ia=1.6 <2500, Ib= 1<1800, Ic= 0.9<1320

10 KTU

(April

2018)

6

Prove that symmetrical components transformation is power

invariant.

5 KTU

(Dec

2019)

7 a) How will you draw a reactance diagram when the single line

diagram of a power system is given?

b) A three phase delta-star transformer with a rating of 1000kVA,

11kV/400V has its primary and secondary leakage reactance as

12Ω/ph and 0.05Ω/ph respectively. Calculate the p.u reactance of

transformer

10

KTU

(Dec

2019)

8 The symmetrical components of phase a voltages in a 3-phase

unbalanced system areVa0=10∠1800V, Va1=50∠00V andVa2=20∠900

V. Determine the phase voltages Va, Vb,and Vc

10 KTU

(Dec

2019)

9 How is zero sequence network drawn for an unloaded generator

grounded through reactance Z? Also draw the zero sequence

network for a star connected load with neutral grounded through

Z.

5 KU

(June

2015)

10 Show how the symmetrical components can be expressed in

terms of phase currents in an unbalanced 3 phase system.

10 KU

(June

2015)

11 Adelta connected load is supplied from a 3 phase supply. The fuse

in B line is removed and current in the other 2 lines is 20 A. Find

the symmetrical components of line currents.

10 KU

(June

2015)

Module 2

1 A single line to ground fault occurs at the terminals of a 30MVA,

11kVgenerator.The positive, negative and zero sequence impedances in pu

are j0.2, j0.2 and j0.05 respectively. Find the line currents under faulted

conditions. Assume that the generator is solidly grounded.

5 KTU

May

2019

2 Two 11 kV, 3-phase generators rated 10 MVA, 25% and 20 MVA, 40%

operate in parallel. Calculate the short circuit kVA if a three phase short

circuit occurs on the feeder at point ‘F’ as shown in the figure. Calculate

the reactance value of the feeder reactor to be included so that the short

circuit kVA is reduced by50%.

5

3 A three phase generator is connected to a star-delta transformer as shown

in the figure. The reactance values referred to a common base are as

follows. Determine the fault current when a double line to ground fault

occurs at point ‘P* at the mid-point of the line if the alternator neutralize

grounded. Assume that the generator is not loaded.

5 KTU

May

2019

4

What is the purpose of using reactors in the bus bars

10 KTU

May

2019

5 For what relation between sequence reactance of an alternator, a single

lineto ground fault current is more than due to a 3 phase short circuit ?

Derive it.

10

6 Draw the sequence network connection for a double line to ground fault at

any point in a power system and obtain expression for the fault current.

6

7 Two 66 kV alternators of ratings 8 MVA and 10 MVA having % reactance

of 8 and 10 are connected to a common bus bar. A transmission line of

2500 km is connected to the bus bar through a step up transformer having

a % reactance of 5.5. The resistance and reactance of the line per km are

0.020 and 0.0150 respectively. Calculate the short circuit MVA for a 3

phase symmetrical fault at the receiving end of the transmission line.

10

8 What is short circuit MVA ? If the full load current corresponding to base

KVA is 1684 A and percentage reactance up to fault point is given as

38.89%, calculate short circuit current.

10

9 A3 phase alternator can supply a maximum load of 5000 KVA at 6600 V.

The machine has internal reactance of 6%. Find the reactance per phase of

the limiting reactor if the steady apparent power on short circuit is not to

exceed 5 times the full load value.

10 Explain different types of current limiting reactors 5 KTU Dec

2019

Module 3

1

Explain the computational procedure for load flow solution using

fast decoupled load flow method.

5 KTU

May

2019

2 Figure shows a three bus power system. The impedance of each

line is (0.026 + 0.11) pu.

Assuming a flat voltage start, find the voltages and bus angles at the

buses at the end of the first iteration using Gauss-Siedel method.

5 KTU

May

2019

3

Mention the advantage of Gauss sidel Analysis and state the

necessity of using acceleration factor.

10 KTU

May

2019

4 With the help of neat flow chart explain how load flow is done

using NR method

5 KTU Oct

2019

5

Derive FDLF power flow equations starting from classical NR

method.

5 KTU Oct

2019

6 Starting from the first principles, obtain the equations of real power

and reactive power used in load flow problem..

5 KTU Dec

2019

7

Explain the need of slack bus in LFA. Why it is termed as reference

bus

6 KTU Oct

2019

8 Details of a 3 bus system is shown in table. All impedances are in

p.u. on 100 MVA base. The maximum and minimum reactive power

limits for bus 3 are 300 and 0 MVAR respectively. Compute the

voltage magnitudes and angles at the end of second iteration using

Gauss-Seidel method with an acceleration factor of 1.6.

10

Module 4

1 Draw the block diagram representation of Load Frequency Control

(LFC) of a single area system & explain the steady state stability for

free governor operation

10

KTU

(Dec

2019)

2 A two area system connected by a tie line has the following

parameters on a 1000 MVA common base.

The units are operating in parallel at a nominal frequency of 60 Hz.

The synchronizing power co-efficient is given as 2.0 pu. If the load

in areal increases by 187.5 MW, determine the new steady state

frequency and the change in tie-line flow.

10

KTU

(April

2018)

3 The units are operating in parallel at a nominal frequency of 60 Hz.

The synchronizing power co-efficient is given as 2.0 pu. If the load

in areal increases by 187.5 MW, determine the new steady state

frequency and the change in tie-line flow.

10

KTU

(April

2018)

4 Prove that the maximum permissible sudden increase in load is

72.5% of the steady state limit if the machine is initially at no load.

10

KTU

(April

2018)

5 Find the energy stored in the rotor of a three phase, 50 Hz. 250 MVA

turbo alternator with H=7.5 MJ/MVA. Determine the value of the

inertia constant

M. The generator is initially supplying a steady power of 150 MW.

If the mechanical power input to the turbine is suddenly decreased

to 100 MW, evaluate the initial acceleration of the rotor.

10

KTU

(April

2018)

6

Derive the block diagram of AGC of a two area system connected

by a tie- line.

15

KU

(May

2014)

7 Two system areas are connected by a tie line with the following

characteristics. A load change of 180 MW occurs in area 1. What is

the new steady state frequency and what is the change in tie flow ?

Assume both areas were at nominal frequency of 50 Hz to begin.

10

KU

(April

2015)

8

Explain the working principle of an AVR.

10

KU

(May

2013)

Module 5

1 The fuel cost functions for three thermal plants in Rs/hr. are given

by, C; = 500 + 5.3P; +0.004P;" C2 = 400 + 5.5P2 +0.006P2° C3; = 200 + 5.8P3 +0.009P3°

Find the power generated by each plant if the total demand is

80oMW.

5

KTU

(April

2018)

2 What do you mean by penalty factor as referred to economic

operation of power system?

5 KTU

(April

2018)

3 Derive the expression for transmission losses as a function of

power generation.

4 KU

(May

2014)

4 Derive the expression for transmission losses as a function of

power generation.

5 KTU

(April

2018)

5 What is unit commitment problem? What are the constraints and

the solution techniques for unit commitment problem involving

thermal plants?

5 KTU

(April

2018)

6

Explain different constraints on unit commitment.

6 KU

(May

2014)

7 Derive the expression for penalty factor ? What is its significance

in load dispatch problem345

6 KU

(May

2014)

8 Find the optimal dispatch of the given units. The total load to be

supplied is 850 MW.

10

KU

(May

2014)

What is meant by incremental loss and how it affects the penalty

factor

4 KU

(April

2015)

Differentiate between economic dispatch and unit commitment.

7 KU

(April

2015)

Derive the equation for transmission loss in terms of B coefficients.

10 KU

(May

2013)

What will be the load sharing of a plant if its penalty factor is less

than one

4 KU

(May

2013)

Module 6

1

What are the factors affecting transient stability in power system?

5 KTU

(April

2018)

2 What is swing equation? Derive the expression for swing equation

fora synchronous machine connected to an infinite bus.

5 KTU

(April

2018)

3

Explain Equal Area criterion and state the assumptions made.

6 KTU

(April

2018)

4 A synchronous motor is receiving 30% of the power that it is

capable of receiving from an infinite bus. If the load on motor is

doubled, calculate maximum value of § (torque angle) during the

swing of motor around its new equilibrium position.

10

KU

(May

2014)

5 State the importance of stability analysis in the planning and

operation of a power system.

5 KU

(June

2016)

6 Derive the swing equation of a synchronous machine?

5 KTU

(Dec

2019)

7 Draw and explain power angle curve of a synchronous machine?

5

KTU

(Dec

2019)

8 A 50 Hz generator is delivering 1.0 p.u. power to an infinite bus

through a transmission network. The maximum power which can

be transferred for pre-fault, during fault and post fault conditions

are 1.8 p.u., 0.4. p.u. and 1.3 p.u. Find the critical clearing angle.

15

KU

(April

2015)

ELECTRIC DRIVES

Module 1

Sl. No Questions Marks KU/

KTU

(Month/

Year)

1

Draw the block diagram of a closed loop speed control of an

electric drive.

5

KTU

April 18

Differentiate between passive and active load torques. Give

examples of each.

3

2

A motor when operating in quadrant I and II has the characteristic

T = 400 – 0.4N Nm, where N is the speed in rpm. The load which

is coupled to the motor is an active load with the characteristic, T

l = ±200 Nm. Calculate the motor speeds for motoring and

braking operation in the forward direction. When the drive is

operating in quadrant III and IV, motor has the characteristic, T =

- 400 - 0.4N Nm. What will be the equilibrium speed in quadrant

III?

7

KTU

April 18

3

Draw and explain the speed torque curves of a fan load and

traction load

4 KTU

April 18

Derive an expression for equivalent moment of inertia and

equivalent torque for a motor load system for loads with rotational

motion, all referred to motor shaft.

5 KU

April 16

4

What are the different components of a load torque? Explain each

component in detail.

5

KTU

April 19

5

Derive the mathematical condition to obtain the steady state

stability of equilibrium point.

5 KTU

April 19

6

What is an Electric Drive? Explain the function of each blocks

with the help of a neat block diagram.

5 KTU

April 19

Derive the fundamental equations of Motor load system. 5 KU Nov

15

Module 2

Sl. No Questions Marks KU/KTU

(Month/Y

ear)

1

Derive the speed torque characteristics of DC separately excited motor. Draw

its speed torque characteristics for variable armature resistance.

5

KTU

April 18

State and explain how armature current and speed of a dc separately excited

motor will be affected by halving armature voltage and field current with load

torque remaining constant.

3

2

Explain the speed control of separately excited DC motor using combined

armature voltage and flux control method. Draw and explain the torque and

power capability curves.

7

KTU

April 18

3

A 220 V, 1500 rpm, 50 A separately excited motor with armature

resistance of 0.5 fi is fed from a three-phase fully controlled rectifier.

Available ac source has a line voltage of 440 V, 50 Hz. A star-delta connected

transformer is used to feed the armature so that motor terminal voltage equals

rated voltage when the converter firing angle is zero. Determine the value

of firing angle when„ (a) motor is running at 1200 rpm and rated torque

and (b) when motor is running at -800 rpm and twice the rated torque.

6

KTU

April 18

Explain the armature voltage control and field weakening mode

control of DC separately excited motor drive system.

5

7

Draw and explain the torque speed characteristics of viscous

friction load and fan type load.

5 KU Oct

14

Draw and explain the torque speed characteristics of a fan and

centrifugal pump

5

KU Oct

14

8

What are the factors to be considered for the selection of an

electric motor for a particular drive?

5

KU Nov

13

What are the different components of load torque? Explain. 5 KU Nov

13

4 Derive the power factor of a three phase fully controlled converter drive for a

separately excited dc motor.

5 KTU

April 19

5

With a neat sketch, explain the motoring and braking operation of

three phase fully controlled rectifier control of separately excited

DC motor

10 KTU

April 19

6

Explain the speed control of a separetly excited DC motor using single

phase half controlled bridge converter with relevant waveforms. Obtain the

expression for average armature voltage for discontinuous conduction

mode of operation.

10

KU April

16

7

Explain how the speed of a separatly excited DC motor can be controlled in all

the four quadrants using a dual convertor, when the dual converter is operating

in circulating current mode.

10

KU Nov

15

8

Explain the simultaneous and non simultaneous control of dual

convertor

10 KU Oct

14

Module 3

Sl. No Questions Marks KU/KTU

(Month/

Year)

1

Draw the circuit diagram of a class-C chopper fed DC motor. Draw its

V/I characteristics.

5

KTU

April 18

What are the different types of braking in DC motors? Why plugging is not

popular. How the dynamic braking can be implemented by using a chopper

5

2

A 220 V, 900 rpm, 100 A separately excited DC motor has an

armature resistance of 0.05 Ohm. It is braked by plugging from an initial

speed of 1000 rpm. Calculate (i) Resistance to be placed in the armature circuit

to limit braking current to 1.5 times the full load torque. (ii) Braking torque and

(iii) Torque when the speed has fallen to zero.

5

KTU

April 18

With a chopper circirit and waveforms explain the regenerative

braking of a DC motor drive.

5 KTU

April 19

3

What are applications of cycloconverters ?Explain its principle of operation

with the help of mid-point type cycloconverters.

5

KU

Write short notes on motoring and regenerative braking control of separately

excited DC motor with circuit diagram and waveforms.

5 KU

4

A separately excited DC motor fed from a converter can be worked as

generator when the firing angle is increased towards 90 0 and by reversing the

armature terminal mechanically. Draw the circuit diagram. Can you realize the

same by using a dual converter and without using a mechanical switch? Draw the

circuit diagram for the implementation and explain its working.

10

KTU

April 18

5

Derive the output equation of a cyclotron 5 KU April

16

Why reverse voltage braking is not possible with single phase half controlled

rectifier

5 KU April

16

6

A 220 V, 24 A, 1000 rpm separtly excited DC motor has an armature resistance

of 2fi. it is controllled by a chopper with frequenc of 500 Hz and source

voltage of 230 V. Calculate the duty ratio for 1.2 times rated torque and

500 rpm.

5

KU April

16

7 Explain the operation of four quadrant chopper fed separately excited DC

motor ' drive with necessary diagram

10 KTU

April 19

8

Draw and explain the forward motoring and regenerative braking operation of a

chopper fed DC motor

10

KU April

16

9

A 230 V, 1200 rpm 15 A seperatly excited motor has an armature resistance of

1.2 fi. motor is operated under dynamic braking with chopper control. Braking

resistance has a value of 20 fi. i) Calculate the duty ratio of

the chopper for motor speed of 1000 rpm and braking torque equal to 1.5 times

the rated torque.

ii) What will be the motor speed for duty ratio of 0.5 and motor torgue equal to

its rated torque.

10

KU April

16

Module 4

Sl. No Questions Marks KU/KTU

(Month/Y

ear)

1

Draw and explain the speed torque characteristics of a variable stator voltage

controlled induction motor. Why stator voltage control is not suitable for

speed control of induction motor with constant load torque.

5

KTU April

18

Explain the speed control method of induction motor with stator

voltage and also state the disadvantages of this method.

5

KTU April

19

2

What is slip power recovery scheme? Describe static Scherbius drive

and show that the slip at which it operates is given by S = - (aT /a) cosa,

where ‘a’ and ’a T ‘ pertain to per phase turns ratio for induction motor and

transformer respectively. Why it is always suggested to use a transformer in

line side converter for static Scherbius drive?

10

KTU April

18

3

Why stator voltage control is suitable for speed control of induction motors in

fan and pump drives?

5 KU April

16

What are the advantages of static rotor resistance control over conventioanal

methods of rotor resistance control?

5

KU April

16

4 Explain the closed loop static rotor resistance control method for

the speed control of a slip ring induction motor. What are the

disadvantages of this method?

10 KTU April

19

5 Explain the static Kramer scherne for the speed control of a slip

ring IM. Explain (10 ) the firing angle control of thyristor bridge

with constant motor field.

10 KTU April

19

6

7

Explain the closed loop speed control with static rotor resistance control for a

3 phasesquirrel cage induction motor

10 KU April

16

Explain with diagram thyristor phase control scheme for speed variation of a

3 phase squirrel cage induction motor.

10 KU April

16

8 Explain with circuit diagram and wave form the rotor chopper speed control of

slip ring induction motor

10

KU Nov

15

Module 5

Sl. No Questions Marks KU/KTU

(Month/Y

ear)

1

What are the different methods for obtaining variable output voltage from an

inverter? Explain.

5

KTU April

18

What is field oriented control of induction motor? Why it is superior to other

types of speed control?

5

2

Why square wave inverter fed induction motor drives are not

popular?

5

KTU April

18

Explain the frame transformation from three phase to synchronous reference

frame. What is its significance in induction motor drive?

5

3 Explain the difference between the VSI fed induction motor drive and CSI

fed induction motor drive

5 KTU April

18

4 Compare CSI fed IM drive with VSI fed IM drive 5 KTU April

19

5 With a neat circuit and waveform explain a thyristor based CSI

fed IM drive

5 KTU April

19

6

Explain how CSI fed M drfre can be used for regenerative braking

and multiquadrant operation

5 KTU April

19

Explain the salient features of CSI fed induction motor drive 5 KU April

14

7 Explain the slip power recovery scheme with advantages and

disadvantages.

10 KU May

13

8 Draw and explain the torque speed characteristics of 3 phase induction motor

under v/f control.

10 KU May

13

Module 6

Sl. No Questions Marks KU/KTU

(Month/Y

ear)

1

Explain power and torque capability curves of a synchronous

motor drive. In variable frequency control of synchronous

motor drive, why V/f ratio is maintained constant upto base speed

and voltage constant above base speed.

5

KTU April

18

Draw the bock diagram of microprocessor based control of

permanent magnet synchronous motor drive

5

2 When a synchronous motor is operating in true synchronous

mode, frequency must be varied in steps. Why?

5 KTU April

18

3

A 5 MW, 3 phase, 11 kV, Y connected , 6 pole, 50 Hz, 0,9

leading power factor synchronous motor has Xs = 9 fi and Rs =

0 fi. Rated field current is 50 A. Machine is controlled by

variable frequency control at constant V/f ratio upto the base

speed and at constant voltage, above rated speed.

Determine (i) Torque and field current for the rated armature

current, 750 rpm and 0.8 leading power factor and (ii) Armature

current and power factor for half the rated motor torque, 1500

rpm and rated field current.

10 KTU April

18

4

Explain in detail about the classification of PM

synchronous motor.

5

KTU April

19

5 Explain the field oriented control (FOC) of an AC

motor with a block diagram.

5 KTU April

19

6 With a block diagram explain the Micro controller

based PMSM drive.

5 KTU April

19

7 Explain the operation of different types of permanent magnet

synchonous motor drives

10

PRINCIPLES OF MANAGEMENT

Module 1

Module 2

Sl. No

Questions

Marks

KU/KT

U

(Month

/Year)

1

Define Management

3

2017

Jan

2

Explain the art & science perspectives of Management

3

2017

Jan

3 Describe any four elements of the external environment of a

manufacturing Firm with a suitable example

4

2018

June

4

Explain challenges faced by new generation firms

4

2018

June

5

Explain various features of the organizations of the new era

4

2017

Jan

6

Explain Competitive advantage

2

2018

June

7

Explain Current challenges of a Manager. b) How would you

tackle it?

10

2017

Jan

8

Explain various roles of a manager

10

2017

Jan

Sl. No

Questions

Marks

KU/KT

U

(Month

/Year)

1. Explain any four contributions of Henry Fayol 4 2017

Jan

2. Explain Mc. Gregor’s X and Y Theory 4 2018

June

Module 3

3. Why Elton Mayo’s study is called Human relations

Management

2 2017

Jan

4. Describe any two examples of CSR 4 2017

Jan

5. Distinguish between systems approach and contingency

approach

3 2018

June

6. Draw 7S frame work 3 2017

Jan

7. Explain Scientific Management. 10 2018 June

8. What are the contributions of FW Taylor? 10 2017

Jan

Sl. No

Questions

Marks

KU/KT

U

(Month

/Year)

1. List any four objectives of Planning 4

2. Who does strategic planning and why? 3 2017

Jan

3. Differentiate between goal, plan and procedure 3 2018

June

4. Explain the steps in Planning process 7 2017

Jan

5. Who does Operational planning and why it is easier? 5 2018

June

6. What are the advantages of MBO 4 2018

June

7. How MBO helps an organization to achieve organizational

goals? 4 2018

June

8. Write short notes on a) Strategic planning, b) Tactical planning

c) Operational planning

7

2017

Jan

Module 4

Module 5

Sl. No

Questions

Marks

KU/KT

U

(Month

/Year)

1. Explain Departmentation. 5 2018

June

2. Define Span of control 4 2017

Jan

3. Classify the factors effecting span of control 3 2018

June

4. What are the merits and demerits of Line organization 5 2018

June

5. Decision Making is a difficult task. Why? 4 2017

Jan

6. Distinguish between programmed and non-programmed

decisions 6 2018

June

7. Explain Organizational structure and its various types. 10 2017

Jan

8. Explain Decision Making process and its limitations 5 2018

June

9 Explain Creative process and innovation 6 2017

Jan

10 Write short note on : Decision Making under certainty,

uncertainty and risk

8 2018

June

Sl. No

Questions

Marks

KU/KT

U

(Month

/Year)

1. Explain Staffing function 4 2017

Jan

2. Describe why delegation of authority is required 4 2017

Jan

Module 6

3. Explain characteristics of an entrepreneur 5 2018

June

4. Explain Organizational Culture 4 2017

Jan

5. How does it affect organizational effectiveness? 5 2017

Jan

6. Explain staffing. 4 2018

June

7. How Manager Inventory chart helps in staffing? Explain with

a diagram

6 2018

June

8. Explain systems approach to selection with a diagram. 7 2017

Jan

9 How Job design is important in an organization? b) How would

you design a job? 4 2018

June

10 What factors would you consider for the best job design? 6 2018

June

Sl. No

Questions

Marks

KU/KT

U

(Month

/Year)

1. Comment and compare Leaders Vs. Managers 5 2018

June

2. Explain Transactional & Transformational Leadership 4 2018

June

3. Differentiate between feedback and feed forward control. 7 2017

Jan

4. Write a short note on Global controlling 8 2018

June

5. Explain the dimensions of leadership with a diagram 5 2017

Jan

6. Control techniques used in an organization depends on various

factors. Explain common control techniques used in

organizations.

7 2018

June

7. How preventive control helps an organization to avoid

problems in advance? Explain

6

2017

Jan

8. Explain Overall controls 8 2018

June

9 Explain various Leadership styles 8 2017

Jan

10 Explain the process of controlling function with the aid of a

sketch. 8 2017

Jan

Illumination Technology (EE 366) S6 EEE

Sl No. Question Marks Bloom’s

Taxonomy

Module 1

1 What are the requirements of a good artificial lighting scheme? 5 KTU

April

2018

2 Explain with a neat diagram the different types of artificial lighting system

used. Clearly show the amount of light thrown to up and down direction.

Also specify the areas where they are commonly used.

10 KTU

April

2018

3 What is disability and discomfort glare? Explain on VCP and UGR in

connection with glare rating.

5 KTU

April

2018

4 Mention the various types of luminaries used for proper lighting scheme. 5 KTU Dec

2018

5 What are the different types of glare? 5

6 How glare can be eliminated in artificial lighting? 6

7 Explain Colour rendering and Stroboscopic effect 5

8 What are the different factors affecting lighting.

6

9 What are the factors affecting the quality of artificial lighting? 5 KTU

May

2019

10 What is a glare? How it is classified. 3 KTU

May

2019

11 What are the different lighting schemes employed in interior

lighting? Clearly state the percentage of light flux in different

directions.

7 KTU

May

2019

12 What is the effect of stroboscopic effect on visual comfort in an

artificial lighting scheme? How the effect can be reduced

4 KTU

May

2019

Module 2

1 Illustrate with a neat diagram the concept of polar curve in illumination

technology

5 KTU

April

2018

2 Explain how is photometric bench is used for measuring candle power of a

test lamp.

5 KTU

April 2018

3 Define Inverse square law in illumination. 5 KTU

April 2018

4 With the help of a neat diagram explain the working of a standard radiator

used as a primary standard for measuring one Candela.

6 KTU

April 2018

5 Define MHCP, MSCP? 5 KTU

April 2018

6 A certain incandescent lamp, hangs from the ceiling of a room. The

illuminance received on a small horizontal screen lying on a bench 2m

vertically below the lamp is 63.5 lux. Calculate illuminance at a point when

the screen is moved horizontally a distance of 1.5m along the bench.

5 KTU Dec

2018

7 Derive the expression for illumination in the case of a round source. 10

8 Define (i) Luminous Flux (ii) Luminous Intensity (iii) Illumination (iv)

Brightness

6

9 With the help of appropriate sketches, explain polar luminance

distribution curve

5 KTU May

2019

10 Explain how illumination can be calculated for Line source and

Surface source.

4 KTU May

2019

11 Explain the terms Mean Spherical Candle Power (MSCP) and Mean

Hemispherical Candle Power (MHCP).

2 KTU May

2019

12 Explain the term luminous efficacy? How the luminous efficacy of

artificial light sources affect the operational cost of a lighting system?

2 KTU May

2019

13 Explain inverse square law and Lamberts cosine law with the help of

neat sketches

4 KTU May

2019

14 Four lamps 15m apart are arranged to illuminate a corridor. Each lamp

is mounted at a height of 8m above the floor level. Each lamp gives

450 Cd in all directions below the horizontal. Find the illumination at

the point ‘P’ midway between second and third lamp.

4 KTU May

2019

Module 3

1 Specify the need of DLOR and ULOR in artificial architectural lighting. List

out three factor on which DLOR and ULOR depends.

5 KTU

April

2018

2 An office 30m X 15m is illuminated by twin 40w fluorescent luminaries of

lumen output 5600 lumens. The lamps being mounted at a height of 3m from

the work plane, the average illumination required is 240lux. Calculate the

number of lamps required to be fitted in the office, assuming the CU 0.6 and

maintenance factor to be 0.8. Assume the height of ceiling as 4.5m

10 KTU

Dec

2018

3 The Kinfra apparel park provides space area of 40 m long, 20 m wide and 8

m in height to a textile company. The luminaires are suspended 1.5 m below

ceiling level. The sewing machines are placed 1 m high from the floor level.

Calculate the minimum number of luminaires which must be installed to

conform a recommend SHR (Space height ratio) of 1.5 : 1. Clearly show the

layout of the luminaires.

10 KTU

April

2018

4 What are the special features that must be taken care of while illuminating

staircase and entrance way?

4 KTU

April

2018

5 With a neat diagram give the application of i) soffit fixtures ii) Recessed

fixtures iii) Track fixtures and iv) Pendants

6 KTU

April

2018

6 What are the different features of corridor lighting? 5

7 What are the factors affecting Coefficient of utilization? 10

8 Design illumination for a domestic building with the following details. Bed

room – 3mx3m (2no.s), Living Room 4mx3m, Kitchen 3mx2.5m, dining

3mx3m, store 2mx1.5m, stair area 1.5mx1.5m, Verandha 1mx1.5m.

Assume coefficient of utilization and maintenance factor as0 .8 &0.6

respectively

10

9 What are the desirable features of a luminaires? 5 KTU

May

2019

10 What is ULOR and DLOR? How these parameters aid in selecting luminaries

for different applications.

4 KTU

May

2019

11 Calculate the room index for a hall of dimensions 10m X 8m X 3m.

Luminaries are suspended at height of 0.8m from the ceiling and work

plane height is 0.85 from floor.

2 KTU

May

2019

12 Define 1. Coefficient of utilisation 2. Depreciation factor 2 KTU

May

2019

13 A room 8m x12m is lighted by 15 lamps to a fairly uniform illumination of

100 lm/m2. Calculate the utilisation factor of the room, given that the

output of each lamp is 1600 lumens.

4 KTU

May

2019

Module 4

1 What are the main factors to be considered while designing street/ road

lighting?

6 KTU

April 2018

2 Calculate the average illuminance on a road having 30 m width and having

street light span of 30 m. The luminary used is a sodium vapour lamp

luminaire and is arranged in single side layout. The total light output of the

luminaire is 5000 lumens. The utilisation factor is 0.8 and the multiplication

factor is 0.75.

5 KTU

April 2018

3 A road of 300m long is required to be illuminated by providing 40 W

fluorescent tube. The width of the road is 4m. Design a street lighting

scheme as per BIS standard. Average illumination required is 0.6 lux.

10

4 As per the Indian standard recommendation and standard practices can

you explain the illumination levels in various areas

7

5 Explain the various arrangements in street lighting 7

6 What are the different types of street and their illumination required

as per BIS standard.

5

7 What are the different fixtures used in street lighting? 5

8 Explain the properties of good street lighting system 5

9 What are the different lighting schemes used for street lighting? Explain

with appropriate sketches.

5 KTU May

2019

10 What are the advantages and disadvantages of using LED light as street

light?

4 KTU May

2019

11 Define up cast angle, outreach, pole set back and mounting height in street

lighting. Give a clear picture showing all these.

4 KTU May

2019

12 Explain the different types of fixtures used in street lighting. 4 KTU May

2019

13 An assembly line space has an area of 40 m long, 20 m wide and 8 m in

height. The luminaires are suspended 1.5 m below the ceiling level. The

work table are placed 1 m high from the floor level. Calculate the minimum

number of luminaires which must be installed to conform a recommended

SHRmax (Space.height ratio) of 1.5. Show the layout of the luminaires.

Also calculate the average illuminanace achieved with the minimum

number of luminaires with each luminaire fitted with 4 numbers of

fluorescent lamps with an initial lamp flux of 1350 lumen. Assume

MF=0.77 and UF= 0.75

3 KTU May

2019

Module 5

1 What you do mean by flood lighting? List out the requirements of a good

flood lighting scheme used for a football stadium.

5 KTU April

2018

2 LED lit luminaires are encouraged by the supply provider for various good

reasons. What are the design modifications needed when LED luminaires

are used for outdoor flood lighting purpose?

5 KTU April

2018

3 What are different methods available for aiming the lamp in flood lighting? 10 KTU April

2018

4 Explain the various design parameters taken into consideration while

designing street lighting and flood lighting.

6 KTU Dec

2018

5 A parking area measuring 135m in length and 90 m in width is to be

provided with area lighting. The specifications given are

Illumination required = 10 lux

Mounting height restriction = 10 m

Lamps per pole = 2

The available lamp details are

Determine the layout of the lighting scheme with the wattage of lamps

required

Details HPSV LPSV

CU 0.60 0.55

LLF 0.75 0.9

10

6 What are the different types of projector used in flood lighting? 10

7 The front of the building 50 x 20 m2 is desired to be illuminated by

flood lighting projections placed at a distance of 25 m from the wall.

The average illumination required is 50 lux. Estimate the number and

size of projectors required. Assume that the waste light factor is 1.2

depreciation factor is 1.4 and co efficient of utilization is 0.36

Wattage 250 500 1000

Lumens 4000 6000 12000

10

8 What are the different types of lighting fixtures used for flood lighting 6 KTU May

2019

9 What are the important factors to be considered while designing the flood

lighting of a multi-storeyed building?

5 KTU May

2019

10 What are the different types of flood lights used for outdoor lighting 5 KTU May

2019

11 A building frontage 50m x 25m is to be illuminated by flood lighting

projectors situated 25m away. If the illumination is 50 lux, coefficient of

utilisation is 0.5, depreciation factor 1.5, waste light factor 1.2. Estimate

the number and size of projectors. Sketch the projectors recommended

indicating the adjustments provided.

10 KTU May

2019

12 What are the different methods available for aiming of lamp in flood

lighting?

5 KTU May

2019

Module 6

1 List out the design consideration while illuminating a sports area such as a

tennis court.

5 KTU

April 2018

2 What are different types of emergency lighting used in a hospital? 5 KTU

April 2018

3 During the Onam week celebration organised by the Dept. of Tourism, it is

a customary to illuminate the Kerala Secretariat Building and the arterial

road in the capital city in different colours. As an illumination engineer what

are the different factors which must be considered for i) Illuminating the

Secretariat building ii) The roads way aesthetic lighting iii) A Statue in front

of Secretariat building

10 KTU

April 2018

4 List out and explain at least five features of auditorium lighting. 10 KTU

April 2018

5 What are the properties of Aesthetic lighting? 5

6 List out the design consideration while illuminating a sports area such as a

Swimming pool.

10

7 Explain the problems created by Aesthetic lighting. 5

8 Design an auditorium lighting scheme. 10

9 What are factors to be considered while selecting luminaries for different

areas in hospitals?

5

10 Explain the design criteria for stadium lighting. 5 KTU May

2019

11 What are different factors to be considered while designing aesthetic

illumination of bridges and statues?

5 KTU May

2019

12 What is the importance of modelling and shadows in the case of sports field

lighting?

5 KTU May

2019

13 The boundary of a football stadium is 100m x 50m. The recommended

illumination level is 500 lux. Luminaries of 1000W with light output of

92000 lumens are used for installation. Calculate the number of luminaries

required to get the recommended level of illumination. Assume utilisation

factor = 0.8, maintenance factor = 0.8, light loss factor = 1.2. Sketch the

configuration of light fittings.

5 KTU May

2019