A. few turns of thin wire
B. few turns of thick wire
C. many turns of thin wire
D. many turns of thick wire
A. thermocouple
B. pyrometer
C. resistance thermometer
D. thermometer
A. 20 A
B. 50 A
C. 100 A
D. 200 A
A. transposition of the power line
B. transposition of the communication line
C. both (A) and (B)
D. increasing the distance between the conductors
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. 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. have low contact resistance
B. be clean and smooth
C. be of sufficient size and proper shape
D. have all above properties