Protection by fuses is generally not used beyond__________?
Protection by fuses is generally not used beyond__________?
A. 20 A
B. 50 A
C. 100 A
D. 200 A
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The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?
The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?A. lengthening of the gap
B. cooling and blast effect
C. both A. and B
D. deionizing the oil with forced air
E. none of the aboveInduction cup relay is operated due to changes in________________?
Induction cup relay is operated due to changes in________________?A. current
B. voltage
C. impedance
D. all of the aboveThe single phasing relays are used for the protection of_____________?
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 motorsAir blast circuit breaker is used for_____________?
Air blast circuit breaker is used for_____________?A. over currents
B. short duty
C. intermittant duty
D. repeated dutyA fuse is connected_______________?
A fuse is connected_______________?A. in series with circuit
B. in parallel with circuit
C. either in series or in parallel with circuit
D. none of the aboveA fuse is never inserted in____________?
A fuse is never inserted in____________?A. neutral wire
B. negative of D.C. circuit
C. positive of D.C. circuit
D. phase dine