Switchgear protection objective questions with explanations
Q no 1 With which of the following ,a circuit breaker must be equipped for remote operation ?
a ) inverse time trip
b ) time -delay trip
c ) shunt trip
d ) none of the above
e ) all of the above
explanations
answer c ) shunt trip
Q no 2. Arc in a circuit behaves as
a ) a capacitive reactance
b ) an inductive reactance
c ) a resistance increasing with voltage across the arc
d ) a resistance decreasing with voltage across the arc
explanations
answer d ) a resistance decreasing with voltage across the arc
Q no 3 . Thermal circuit breaker has
a ) delayed trip action
b ) instantaneous trip action
c ) both of the above
d ) none of the above
explanations
answer a ) delayed trip action
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