Questions on Switchgear Protections Multiple choice Questions and Answers pdf

101.    Oil switches are employed for
(a)    low currents circuits
(b)    low voltages circuits
(c)    high voltages and large currents circuits
(d)     all circuits
Ans: c

102.    A switchgear is device used for
(a)     interrupting an electrical circuit
(b)     switching an electrical circuit    111.
(c)    switching and controlling an electri¬cal circuit
(d)    switching, controlling and protect¬ing the electrical circuit and equipment
Ans: d

103.    The fuse wire, in D.C. circuits, is inserted in
(a)     negative circuit only
(b)     positive circuit only
(c)    both (a) and (b)
(d)    either (a) or (b)
Ans: c

104.    By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
(a) Radiation 
(b) Convection
(c) Conduction     
(d) All of the above
Ans: c

105.    A short-circuit is identified by
(a) no current flow
(b) heavy current flow
(c) voltage drop    
(d) voltage rise
Ans: b

106.    The information to the circuit breaker under fault conditions is provided by
(a) relay 
(b) rewirable fuse
(c) H.R.C. only     
(d) all of the above
Ans: a

107.    To limit short-circuit current in a power system are used.
(a) earth wires     
(b) isolators
(c) H.R.C. fuses   
(d) reactors
Ans: d

108.    A balanced 3-phase system consists of
(a)     zero sequence currents only
(b)     positive sequence currents only
(c)    negative and zero sequence currents 
(d)    zero, negative and positive sequence currents
Ans: b

109.    In a single bus-bar system there will be complete shut down when
(a)    fault occurs on the bus itself
(b)    fault occurs on neutral line
(c)    two or more faults occur simultaneously
(d)    fault occurs with respect to earthing
Ans: a

Read More Questions:
Switchgear Protections MCQs Part1
Switchgear Protections MCQs Part2
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Switchgear Protections MCQs Part5
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Switchgear Protections MCQs Part7
Switchgear Protections MCQs Part8
Switchgear Protections MCQs Part9
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Switchgear Protections MCQs Part11