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Electrical Engineering
Switchgear Protections
Quiz 6
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Q.1
Discrimination between main and back up protection is provided by the use of relays which are
fact
sensitive
slow
none of the above
Q.2
Short-circuit currents are due to
single phase to ground faults
phase to phase faults
two phase to ground faults
three phase faults
E. any of these
Q.3
Transmission line has reflection coefficient as one.
Open circuit
Short-circuit
Long
None of the above
Q.4
The time of closing the cycle, in modern circuit breakers is
0.003 sec
0.001 sec
0.01 sec
0.10 sec
E. none of the above
Q.5
Thermal circuit breaker has
delayed trip action
instantaneous trip action
both of the above
none of the above
Q.6
A thermal protection switch can protect against
short-circuit
temperature
overload
over voltage
0 h : 0 m : 1 s
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