A. 100 microsecond
B. 50 millisecond
C. 0.5 sec
D. 0.1 sec
A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any of the above
A. lubricate the contacts
B. insulate the contacts from switch body
C. extinguish the arc
D. all of the above
E. none of the above
A. zero current
B. maximum current
C. minimum voltage
D. maximum voltage
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. high temperature
B. increase of mean free path
C. increasing field strength
D. all of the above
A. copper tungsten alloy
B. porcelain
C. electrolytic copper
D. aluminium alloy