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.Management Sciences
Category: Switchgear and Protection
H.R.C. fuse, as compared to a rewirable fuse, has_________________?
A. no ageing effect
B. high speed of operation
C. high rupturing capacity
D. all of the above
A switchgear is device used for_____________?
A. interrupting an electrical circuit
B. switching an electrical circuit 111.
C. switching and controlling an electrical circuit
D. switching, controlling and protecting the electrical circuit and equipment
A short-circuit is identified by_____________?
A. no current flow
B. heavy current flow
C. voltage drop
D. voltage rise
The single phasing relays are used for the protection of_____________?
A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors
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
relay is preferred for phase fault on short transmission line?
A. Induction type
B. Reactance
C. Impedance
D. None of the above
Oil switches are employed for_____________?
A. low currents circuits
B. low voltages circuits
C. high voltages and large currents circuits
D. all circuits
Which of the following medium is employed for extinction of arc in air circuit breaker?
A. Water
B. Oil
C. Air
D. SF6
The material used for fuse must have_____________?
A. low melting point and high specific resistance
B. low melting point and -low specific resistance
C. high melting point and low specific resistance
D. low melting point and any specific resistance
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
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