Switchgear And Protection | Switchgear And Protection Objective Type Questions and answers

31.  Large internal faults are protected by

   A. Merz price percentage differential protection

   B. Mho and ohm relays

   C. Horan gaps and temperature relays

   D. Earth fault and positive sequence relays

32.  Which of the following is the least expensive protection for over current in low-voltage system ?

   A. Rewireable fuse

   B. Isolator

   C. Oil circuit breaker

   D. Air break circuit breaker

33.  For the protection of power station buildings against direct strokes the requirements are

   A. Interception

   B. Interception and conduction

   C. Interception, conduction and dissipation

   D. Interception,conduction,dissipation and reflection

34.  The line insulation is............. the insulation level at the station equipment

   A. Less than

   B. Same as

   C. More than

   D. Not directly related with

35.  Discrimination between main and back up protection is provided by the use of relays which are

   A. Fact

   B. Sensitive

   C. Slow

   D. None of the above

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