Switch Gear And Protection Mcqs
Q.1: The main function of a fuse is to_____________?/
A. protect the line
B. open the circuit
C. protect the appliance
D. prevent excessive currents
Q.2: With which of the following, a circuit breaker must be equipped for remote operation ?V
A. Inverse time trip
B. Time-delay trip
C. Shunt trip
D. None of the above
Q.3: Thermal circuit breaker has____________?(
A. delayed trip action
B. instantaneous trip action
C. both of the above
D. none of the above
Q.4: Magnetic circuit breaker has ___________ trip action4
A. delayed
B. instantaneous
C. both of the above
D. none of the above
Q.5: Fault diverters are basically____________?*
A. fuses
B. relays
C. fast switches
D. circuit breakers
Q.6: Arc in a circuit behaves as_______________?+
A. a capackive reactance
B. an inductive reactance
C. a resistance increasing with voltage rise across the arc8
D. a resistance decreasing with voltage rise across the arc8
Q.7: The arcing contacts in a circuit breaker are made of______________?C
A. copper tungsten alloy
B. porcelain
C. electrolytic copper
D. aluminium alloy
Q.8: On which of the following routine tests are conducted ?7
A. Oil circuit breakers
B. Air blast circuit breakers
C. Minimum oil circuit breakers
D. All of the above
Q.9: Which of the following medium is employed for extinction of arc in air circuit breaker?W
A. Water
B. Oil
C. Air
D. SF6
Q.10: SF6 gas______________?
A. is yellow in colour
B. is lighter than air
C. is nontoxic
D. has pungent small

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