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

6.  For the protection of a large squirrel cage induction motor against single phase normally

   A. An over-current relay is used

   B. Differential relay is used

   C. Directional relay is used

   D. Negative sequence current sensitive relay is used

7.  The most commonly used method for the protection of three phase feeder is

   A. Time graded protection

   B. Differential protection

   C. Reverse power protection

   D. None of the above

8.  Which is the pilotless protection method for feeder line ?

   A. Differential protection

   B. Carrier current protection

   C. Time credit protection

   D. None of the above

9.  Time graded protection of a radial feeder can be achieved by using

   A. Definite time relay

   B. Inverse time relay

   C. Both definite and inverse time relays

   D. None of the above

10.  Pilot-wire protection scheme is the most economical and provides high speed relaying for

   A. Short length of lines upto 15 km

   B. Medium length of lives up to 60 km

   C. Long length of lines up to 200 km

   D. All of the above

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