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Free download in PDF High Voltage Engineering Short 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.
41
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
42
The accuracy of the ac field strength depends on
[A]
Harmonic content
[B]
Atmospheric conditions
[C]
Position of meter
[D]
All of these
43
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: Variable capacitor electrostatic voltage generator
44
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
45
In Van de Graaff generators, the shape of high voltage electrode is nearly spherical to avoid
[A]
High surface field gradients
[B]
Corona
[C]
Local discharges
[D]
All of these
46
A two-pulse circuit requires
[A]
Double the number of diodes and half of the no. of capacitors required for single-pulse circuits
[B]
Half of the no. of diodes and double the no. of capacitors required for single-pulse circuits
[C]
Double the no. of diodes and one and a half times the capacitors required for single-pulse circuits
[D]
One and a half times the no. of diodes and double the capacitors required for single-pulse circuits
Answer: Double the no. of diodes and one and a half times the capacitors required for single-pulse circuits
47
The voltage doubler circuit is suitable for the voltage up to
[A]
2V
[B]
4V
[C]
6V
[D]
8V
48
The ripple voltage for half wave rectifier is
[A]
Smaller than that of full wave rectifier
[B]
Larger than that of full wave rectifier
[C]
Equal to that of full wave rectifier
[D]
None of these
Answer: Larger than that of full wave rectifier
49
In the half wave rectifier, charging current can be limited by using an additional
[A]
Resistance in series with the secondary of the transformer
[B]
Inductance in series with the primary of the transformer
[C]
Inductance in series with the primary of the transformer
[D]
Capacitance in series with the secondary of the transformer
Answer: Resistance in series with the secondary of the transformer
50
For insulators and bushings of power transformers, circuit breakers and instrument transformers, the suitable materials is
[A]
Epoxy resin
[B]
Polyesters resins
[C]
Porcelain
[D]
Silicon rubber
51
SF6 Circuit breakers are manufactured up to the voltage of
[A]
33 kV
[B]
66kV
[C]
480 kV
[D]
800 kV
52
Insulation of dry type transformers is done using prepregs. It is manufactured by using
[A]
Glass fibres
[B]
Nomex
[C]
Aramide papers
[D]
All of these
53
The temperature limit for class F insulation is
[A]
105°C
[B]
120°C
[C]
130°C
[D]
155°C
54
Insulation is necessary for the protection of equipment. Insulation is not necessary between
[A]
Coils and earth
[B]
Coils of different phases
[C]
Turns in a coil
[D]
None of these
55
The spreading of spark channels during tracking, in the form of the branches of a tree is called
[A]
Bunching
[B]
Treeing
[C]
sparking
[D]
none of these
56
The thermal breakdown stresses are
[A]
Lower under ac conditions than under dc condition
[B]
Greater under ac condition than dc condition
[C]
Equal in both condition
[D]
None of these
Answer: Lower under ac conditions than under dc condition
57
Within dielectric, an electron starting from the cathode will drift towards the anode and during this motion
[A]
Gains energy from the field and loses during collision
[B]
Gains energy during both motion and collision
[C]
Loses energy during both motion and collision
[D]
Loses energy from the field and gains during collision
Answer: Gains energy from the field and loses during collision
58
Intrinsic breakdown occurs in time of the order of
[A]
10-5 s
[B]
105 s
[C]
10-8 s
[D]
108 s
59
Which is having higher breakdown strength?
[A]
Solid dielectrics
[B]
Liquid dielectrics
[C]
Gases dielectrics
[D]
Equal in all
Answer: Solid dielectrics
60
In equipments filled with liquid dielectric, heat is transferred mainly by
[A]
Conduction
[B]
Convection
[C]
Radiation
[D]
No heat transfers takes place
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