Switchgear and Protection MCQs and Answers for competitive exams

Questions

81 The fuse blows off by

A burning

B arcing

C melting

D none of the above

View Answer

Answer: melting

82 On which of the following effects of electric current a fuse operates ?

A Photoelectric effect

B Electrostatic effect

C Heating effect

D Magnetic effect

View Answer

Answer: Heating effect

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83 An isolator is installed

A to operate the relay of circuit breaker

B as a substitute for circuit breaker

C always independent of the position of circuit breaker

D generally on both sides of a circuit breaker

View Answer

Answer: generally on both sides of a circuit breaker

84 A fuse in a motor circuit provides protection against

A overload

B short-circuit and overload

C open circuit, short-circuit and overload

D none of the above

View Answer

Answer: short-circuit and overload

85 Protection by fuses is generally not used beyond

A 20 A

B 50 A

C 100 A

D None Of The Above

View Answer

Answer: 100 A

86 Oil switches are employed for

A low currents circuits

B low voltages circuits

C high voltages and large currents circuits

D none of the above

View Answer

Answer: high voltages and large currents circuits

87 The fuse wire, in D.C. circuits, is inserted in

A negative circuit only

B positive circuit only

C both (a) and (b)

D all of the above

View Answer

Answer: both (a) and (b)

88 Air blast circuit breaker is used for

A over currents

B short duty

C intermittent duty

D repeated duty

View Answer

Answer: repeated duty

89 Ionization in circuit breaker is facilitated by

A high temperature

B increase of mean free path

C increasing field strength

D all of the above

View Answer

Answer: all of the above

90 The short circuit in any winding of the transformer is the result of

A mechanical vibration

B insulation failure

C loose connection

D impulse voltage

View Answer

Answer: impulse voltage

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