A. no ageing effect
B. high speed of operation
C. high rupturing capacity
D. all of the above
A. have low contact resistance
B. be clean and smooth
C. be of sufficient size and proper shape
D. have all above properties
A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors
A. to operate the relay of circuit breaker
B. as a substitute for circuit breaker
C. always independent of the position of circuit breaker
D. generally on both sides of a circuit breaker
A. current during abnormal condition
B. voltage during abnormal condition
C. constantly the electrical quantities which differ during normal and abnormal conditions
D. none of the above
A. constant for all distances
B. lower than that of if fault occurs away from the relay
C. higher than that of if fault occurs away from the relay
D. none of the above
A. neutral wire
B. negative of D.C. circuit
C. positive of D.C. circuit
D. phase dine