Ungrounded neutral transmission system is not recommended because of system
A. insulation being overstressed due to over voltages
B. insulation overstress may lead to failure and subsequent phase to phase faults
C. being inadequately protected against ground fault
D. all of the above
Answer: Option D
This Question Belongs to Electrical Engineering >> Switchgear Protections
Magnetic circuit breaker has ______ trip action.
A. delayed
B. instantaneous
C. both of the above
D. none of the above
In a circuit breaker the basic problem is to
A. maintain the arc
B. extinguish the arc
C. transmit large power
D. emit the ionizing electrons
The arcing contacts in a circuit breaker are made of
A. copper tungsten alloy
B. porcelain
C. electrolytic copper
D. aluminium alloy
Air blast circuit breaker is used for
A. over currents
B. short duty
C. intermittant duty
D. repeated duty
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