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

1.  Outdoor switchgear is generally used for voltage beyond

   A. 11 KV

   B. 33 KV

   C. 66 KV

   D. 132 KV

2.  The least expensive protection for over current in low-voltage system is

   A. Rewirable fuse

   B. Isolator

   C. Circuit breaker

   D. Air-break switch

3.  Purpose of backup protection is

   A. To increase the speed

   B. To increase a reach

   C. To leave no blind spot

   D. To guard against failure of primary

4.  We do not require any protection against prime mover failure in case of

   A. Turbo generator sets

   B. Hydro generator sets

   C. Diesel engine driven alternators

   D. Back pressure turbo generators

5.  For the protection of stator winding of an alternate against internal fault involving ground the relay used is a

   A. Biased differential relay

   B. Directional over-current relay

   C. Plain impedance relay

   D. Buchholz relay

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