Switchgear and Protection

A. slow making and breaking of load circuit contacts
B. foreign matter on the contact surface
C. too low contact pressure
D. all of the above

A. short transmission line
B. medium transmission line
C. long transmission line
D. medium and long transmission lines

A. high temperature
B. increase of mean free path
C. increasing field strength
D. all of the above

A. inrush protection
B. distance protection
C. time graded and current graded over current protection
D. both (B) and (C)
E. none of the above

A. current wave only
B. voltage wave only
C. Both (A) and (B)
D. power factor wave only

A. required to operate the circuit breaker
B. absorbed by the circuit of relay
C. developed by the relay circuit
D. none of the above

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 above

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 above

A. the spring tension
B. the rate of flux built up
C. armature core air gap
D. all of the above

A. resistance, reactance or impedance
B. voltage and current
C. light intensity
D. temperature
E. all above