High Voltage Engineering Quiz | High Voltage Engineering Multiple Choice Questions and Answers

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Questions
1 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: Only (b) and (c)
2 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: All of these
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3 The series capacitor peak voltmeter is suitable for
A Positive half cycle
B Negative half cycle
C Sinusoidal waveform
D All of these

Answer: All of these
4 For voltage measurements, the gap which gives highest accuracy is
A Sphere gaps
B Field gaps
C Rod gaps
D None of these

Answer: Sphere gaps
5 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: Increases with humidity
6 The expected life at the rated stress can be determined by conducting long duration life tests at increased stress for
A Less than 1 hr
B 1 hr to about 1000 hr
C More than 1000 hr
D None of these

Answer: 1 hr to about 1000 hr
7 Impulse testing of transformers is done using
A Full wave standard impulse
B Chopped wave standard impulse
C Half wave standard impulse
D Only (a) and (b)

Answer: Only (a) and (b)
8 Failure during switching impulse tests are can be determined by
A Visible in oscillograms
B Loud noise produced
C External flashovers
D All of these

Answer: All of these
9 For operating power frequency voltages, a surge arrester has to be a
A Conductor
B Non-conductor
C Semiconductor
D None of these

Answer: Non-conductor
10 For the measurement of radio interference voltages, the detector circuit is provided with a measuring device to measure
A Average value
B Peak value
C Quasi-peak value
D All of these

Answer: All of these
11 In large impulse generators, the spark gaps are generally
A Sphere gaps
B Hemispherical gaps
C Square gaps
D Either (a) or (b)

Answer: Either (a) or (b)
12 For producing large values of impulse currents, a number of capacitors are charged in
A Parallel and discharged in series
B Parallel and discharged in parallel
C Series and discharged in series
D Series and discharged in parallel

Answer: Parallel and discharged in parallel
13 In a multistage impulse generator, for producing very high voltages, a bank of capacitors is
A Charged in parallel and then discharged in series
B Charged in series and then discharged in parallel
C Charged in parallel and then discharged in parallel only
D Charged in series and then discharged in series only

Answer: Charged in parallel and then discharged in series
14 In a series RLC circuit, the wave front and wave tail times are controlled by changing the value
A R only
B R and L simultaneously
C R and C simultaneously
D L and C simultaneously

Answer: R and L simultaneously
15 The disadvantages of resonant transformers is
A Pure sine wave output
B No high power arcing
C No repeated flashovers
D Additional variable chokes

Answer: Additional variable chokes
16 Resins and varnishes are commonly used in
A Generators and motors
B Cables
C Transformers
D Circuit breakers

Answer: Generators and motors
17 The resin bonded paper bushings are designed to operate at a maximum radial stress of
A 5 kV/cm
B 10 kV/cm
C 15 kV/cm
D 20 kV/cm

Answer: 20 kV/cm
18 In paper based laminated construction, the typical value of dielectric constant and dielectric loss factor is
A 3.5, 0.0015
B 2.5, 0.0020
C 3.5, 0.0025
D 2.5, 0.0035

Answer: 3.5, 0.0025
19 The most commonly used insulating materials for low and medium voltage cables is
A Polyethylene
B Porcelain
C PVC
D Vulcanized rubber

Answer: PVC
20 The example of artificial fibre is
A Rayon
B Cotton
C Flax
D Silk

Answer: Rayon

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