Merz-Price Protection Objective Type Questions and answers

31.  Merz-Price protection is employed for protection of

   A. Alternators

   B. Transformers

   C. Transmission lines

   D. Both A and B

32.  In Merz-Price differential protection of a delta star transformer, the CT secondaries connection in the primary and secondary winding of the transformer would be in the form of

   A. Delta star

   B. Star delta

   C. Delta delta

   D. Star star

33.  For preventing the maloperation of Merz-Price protection scheme on inrush of magnetising current

   A. The relay restraining coil is biased with second harmonic current

   B. Time lag is provided in the relay

   C. Relay sensitivity is reduced by employing a shunt

   D. All of the above

34.  To protect the power transformer ( star-star with neutral grounded) against fault, what type of connection do the CTs have?

   A. Delta star connection

   B. Delta delta connection

   C. Star star connection

   D. Star delta connection

35.  Magnetising in Russian phenomena occur in

   A. Large transformer primary only when the transformer is switched on

   B. Large transformer primary when a three-phase a fault occurs in the secondary

   C. Large transformer secondary only when the transformer is switched on in the primary

   D. None of the above

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