# Measurement of high voltages and currents - Electrical Engineering (MCQ) questions and answers

1)   The attractive force between the electrodes of a parallel plate capacitor is

a. Directly proportional to the square of the applied voltage between plates
b. Directly proportional to the capacitance between the plates
c. Inversely proportional to the square of the separation between the plates
d. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!

2)   The sparkover voltage

a. Increases with humidity
b. decreases with the partial pressure of water vapour in air
c. Humidity effect decreases with the size of spheres
d. Humidity is minimum for uniform field gaps
 Answer  Explanation ANSWER: Increases with humidity Explanation: No explanation is available for this question!

3)   For voltage measurements, the gap which gives highest accuracy is

a. Sphere gaps
b. Field gaps
c. Rod gaps
d. None of these
 Answer  Explanation ANSWER: Sphere gaps Explanation: No explanation is available for this question!

4)   The series capacitor peak voltmeter is suitable for

a. Positive half cycle
b. Negative half cycle
c. Sinusoidal waveform
d. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!

5)   A Capacitance Voltage Transformer can be connected to a

a. High impedance device
b. Low impedance device
c. Relay coil
d. Only (b) and (c)
 Answer  Explanation ANSWER: Only (b) and (c) Explanation: No explanation is available for this question!

6)   Series capacitance voltmeters were used with cascade transformers for measuring rms values up to

a. 100 kV
b. 500 kV
c. 800 kV
d. 1000 kV
 Answer  Explanation ANSWER: 1000 kV Explanation: No explanation is available for this question!

7)   For the measurement of ripple voltage in dc systems, the condition to be satisfied is

a. ωCR >> 1
b. ωCR << 1
c. ωCR = 1
d. None of these
 Answer  Explanation ANSWER: ωCR >> 1 Explanation: No explanation is available for this question!

8)   The accuracy of the ac field strength depends on

a. Harmonic content
b. Atmospheric conditions
c. Position of meter
d. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!

9)   A generating voltmeter is a

a. Variable capacitor electrostatic voltage generator
b. Constant capacitor electrostatic voltage generator
c. Variable inductor electrostatic voltage generator
d. Constant inductor electrostatic voltage generator
 Answer  Explanation ANSWER: Variable capacitor electrostatic voltage generator Explanation: No explanation is available for this question!

10)   To protect the meter against high voltages in case the series resistance fails, the suitable protective device is

a. Paper gap
b. Neon glow tube
c. Zener diode
d. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!