Relays can be designed to respond to changes in
A. resistance, reactance or impedance
B. voltage and current
C. light intensity
D. temperature
E. all above
Answer: Option E
This Question Belongs to Electrical Engineering >> Switchgear Protections
Related Questions on 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
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A. over currents
B. short duty
C. intermittant duty
D. repeated duty
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