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Switchgear Protections - Interview Questions and Answers

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26. The ground wire should not be smaller than No ______ copper.
A. 2
B. 4
C. 6
D. 10
Explanation:
27. The interaction between a transmission line and communication line js minimized by
A. transposing transmission as well as communication lines
B. increasing the height of the trans-mission line tower
C. increasing the distance between the two lines
D. all of the above
Explanation:
28. Overheating of relay contacts or contact born out is due to
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
Explanation:
29. In a circuit breaker the basic problem is to
A. maintain the arc
B. extinguish the arc
C. transmit large power
D. emit the ionizing electrons
Explanation:
30. The time of closing the cycle, in modern circuit breakers is
A. 0.003 sec
B. 0.001 sec
C. 0.01 sec
D. 0.10 sec
Explanation:
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