ECE48:INSTRUMENTATIONQUIZ No. 2

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1. Describe briefly the principle of operation of d'Arsonval meter movement.

2. How can d'Arsonval meter be used to measure:

a. Current

b. Voltage

c. Resistance

3. Calculate the voltage drop developed across d'Arsonval meter movement having

an internal resistance of 600Ω and a full-scale deflection current of 100µA.

4. Find the resistance of multiplier required to convert a 200µA meter movement

into a 0 to 150Vdc voltmeter, if Rm = 1kΩ.

5. Calculate the half-scale current of a meter movement that has a sensitivity of

20kΩ/V.

6. Calculate the value of resistors R1 through R5 in the circuit shown below.

ECE48:INSTRUMENTATIONQUIZ No. 2

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7. Calculate the value of resistors R1 through R3 in the circuit shown in the figure.

8. In the circuit of the figure shown, a voltmeter A having a sensitivity of 5kΩ/V is

connected to points X and Y and indicates 15V on its 30-V range. A voltmeter B is

then connected to points X and Y and indicates 16.13V on its 50-V range.

a. Find the sensitivity of voltmeter B.

b. If R = 40KΩ calculate the error due to voltmeter loading for both meters.