Tricky Switchgear Protections Multiple choice Questions and Answers pdf

91.    The power loss is an important factor for the design of
(a) transmission line
(b) motor
(c) generator 
(d) feeder
Ans: a

92.    A fuse is connected
(a) in series with circuit
(b) in parallel with circuit
(c) either in series or in parallel with circuit
(d) none of the above
Ans: a

93.    H.R.C. fuse, as compared to a rewirable fuse, has
(a)    no ageing effect
(b)    high speed of operation
(c)    high rupturing capacity
(d)    all of the above
Ans: d

94.    The fuse rating is expressed in terms of
(a) current 
(b) voltage
(c) VAR 
(d) kVA
Ans: a

95.    The fuse blows off by
(a) burning 
(b) arcing
(c) melting
(d) none of the above
Ans: c

96.    On which of the following effects of electric current a fuse operates ?
(a)    Photoelectric effect
(b)    Electrostatic effect
(c)    Heating effect
(d)    Magnetic effect
Ans: c

97.    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
Ans: d

98.    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
Ans: b

99.    Protection by fuses is generally not used beyond
(a) 20 A 
(b) 50 A
(c) 100 A 
(d) 200 A
Ans: c

100.   A fuse is never inserted in
(a)     neutral wire
(b)    negative of D.C. circuit
(c)    positive of D.C. circuit
(d)    phase dine
Ans: a

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