High Voltage Engineering Quiz | High Voltage Engineering Short Questions and Answers

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Questions
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

Answer: ωCR >> 1
42 The accuracy of the ac field strength depends on
A Harmonic content
B Atmospheric conditions
C Position of meter
D All of these

Answer: All of these
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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

Answer: 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

Answer: 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

Answer: 4V
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

Answer: Porcelain
51 SF6 Circuit breakers are manufactured up to the voltage of
A 33 kV
B 66kV
C 480 kV
D 800 kV

Answer: 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

Answer: All of these
53 The temperature limit for class F insulation is
A 105°C
B 120°C
C 130°C
D 155°C

Answer: 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

Answer: 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

Answer: Treeing
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

Answer: 10-8 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

Answer: Convection

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