Switchgear Protections - Interview Questions | Exam2Win

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41. To protect most of the electrical equipment handling low power, the types of relays used are

A. thermocouple

B. electronic and bimetallic

C. both (a) and (b)

D. none of the above

Explanation:

42. Protective relays are devices that detect abnormal conditions in electrical circuits by measuring

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

Explanation:

43. Ungrounded neutral transmission system is not recommended because of system

A. insulation being overstressed due to pver voltages

B. insulation overstress may lead to failure and subsequent phase to phase faults

C. being inadequately protected against ground fault

D. all of the above

Explanation:

44. Distance relays are generally

A. split-phase relays

B. reactance relays

C. impedance relays

D. none of the above

Explanation:

45. Magnetic circuit breaker has ______ trip action.

A. delayed

B. instantaneous

C. both of the above

D. none of the above

Explanation: