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Free download in PDF High Voltage Engineering Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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)
(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
(3)
The series capacitor peak voltmeter is suitable for
[A]
Positive half cycle
[B]
Negative half cycle
[C]
Sinusoidal waveform
[D]
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
(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)
(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
(9)
For operating power frequency voltages, a surge arrester has to be a
[A]
Conductor
[B]
Non-conductor
[C]
Semiconductor
[D]
None of these
(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
(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
(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
(19)
The most commonly used insulating materials for low and medium voltage cables is
[A]
Polyethylene
[B]
Porcelain
[C]
PVC
[D]
Vulcanized rubber
(20)
The example of artificial fibre is
[A]
Rayon
[B]
Cotton
[C]
Flax
[D]
Silk
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