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

21.  As soon as a fault develops in a generator stator, it is essential to suppress field excitation, otherwise

   A. Terminal voltage will drop

   B. It may lead to loss of synchronism

   C. It will continue to supply power to the stator winding fault

   D. All of the above

22.  Distance protection scheme is preferred over graded lime-lag over-current protection in HV and EHV lines because

   A. It is faster in operation

   B. It is simple

   C. It is cheaper in cost

   D. All of the above

23.  Requirements of protection power station buildings against direct strokes are

   A. Interception

   B. Conduction

   C.. Dissipation

   D. All of the above

24.  The protection against direct lighting strokes and a high-voltage steep waves is provided by

   A. Ground wires

   B. Lightning arresters

   C. Lightning arresters and ground wires

   D. Earthing of neutral

25.  For protection of rotating machines against lightning surge .............is used

   A. Lightning arrester

   B. Capacitor

   C. Combination of lightning arrester and a capacitor

   D. Lightning conductor and arrester

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