Download PDF
Free download in PDF Switchgear and Protection MCQs 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.
81
The fuse blows off by
[A]
burning
[B]
arcing
[C]
melting
[D]
none of the above
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
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
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
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
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
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
88
Air blast circuit breaker is used for
[A]
over currents
[B]
short duty
[C]
intermittent duty
[D]
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
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
Take Mock Tests