Q.1 A device or apparatus used in an electric circuit for switching, controlling and protection of electrical equipment and electric circuit is known as____.
A. circuit breaker
B. relay
C. switchgear
D. fuse
Ans.: C
Q.02 Which of the following is/are essential features of switchgear?
A. complete reliability
B. quick operation
C. discrimination
D. all of the above
Ans.: D
Q.03 A switchgear operates under____
A. normal condition only
B. abnormal conditions only
C. Both A and B
D. none of the above
Ans.: C
Q.04 A switch is a device which_____.
A. used to open or close an electrical circuit
B. used under full load or no load conditions
C. it cannot interrupt the fault currents
D. all of the above
Ans.: D
Q.05 An isolator is designed to open a circuit ____.
A. on load condition
B. no load condition
C. over load condition
D. any of the above
Ans.: B
Q.06 Air break circuit breaker is___
A. designed to open a circuit under load condition
B. special arcing horns are provided
C. generally used in outdoor circuits of medium capacity
D. all of the above
Ans.: D
Q.07 Isolator switch is generally used on ___
A. one side of circuit breaker
B. both sides of circuit breaker
C. one side of relay
D. one side of fuse
Ans.: B
Q.08 A fuse is inserted in _____
A. in series with the circuit to be protected
B. in parallel with the circuit to be protected
C. in series with neutral
D. as per consumers wants
Ans.: A
Q.08 A circuit breaker is protecting device which operates____
A. under normal conditions
B. under abnormal conditions
C. Both A and B
D. in transient time only
Ans.: C
Q.09 A circuit breaker is designed to operated ____.
A. automatically under abnormal condition
B. manually under normal condition
C. automatically under normal condition
D. Both A and B
Ans.: D
Q.10 Under normal operating conditions, the circuit breakers contacts _____
A. remains open and carry no current
B. remains closed and carries full load current continuously
C. remains closed and carries fault current continuously
D. all of the above
Ans.: B
Q.11 A circuit breaker is a device which ___
A. makes the circuit under normal condition
B. breaks a circuit under abnormal condition
C. Both A and B
D. breaks a circuit under normal condition
Ans.: C
Q.12 Which of the following device which detect the fault and supplied information to the circuit breaker?
A. Fuse
B. Relay
C. Isolator
D. Switch
Ans.: B
Q.13 What are the advantages of duplicate bus-bar system?
A. continuity of supply if fault occurs on one bus-bar
B. maintenance repairs is easy by transferring the load on other bus-bar
C. testing of feeder circuit breaker can be done by transferring supply on spare bus-bar
D. All of the above
Ans.: D
Q.14 A circuit breaker is
A. circuit interrupting device
B. fault creating device
C. fault sensing device
D. fault signal transferring device
Ans.: A
Q.15 Bus bar operates on ____
A. variable voltage
B. constant voltage
C. peak voltage
D. transient voltage
Ans.: B
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