H.R.C. fuses provide best protection against________________?

Related Mcqs:

The arcing contacts in a circuit breaker are made of______________?

A. copper tungsten alloy B. porcelain C. electrolytic copper D. aluminium alloy...

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...

The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?

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...

Which of the following statements is incorrect ?

A. Lightning arrestors are used before the switchgear B. Shunt reactors are used as compensation reactors C. The peak short current is (1.8 xV2) times the A.C. component D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance...

A balanced 3-phase system consists of_______________?

A. zero sequence currents only B. positive sequence currents only C. negative and zero sequence currents D. zero, negative and positive sequence currents...