Relay | Protective Relay Objective Type Questions and answers


1.  The actuating quantity for the relays may be


   A. Magnitude

   B. Frequency

   C. Phase angle

   D. Any of the above


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D. Any of the above

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2.  The operating speed of a relay depends upon the


   A. Rate of flux built up

   B. Armature core air gap

   C. Spring tension

   D. All of these


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D. All of these

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3.  Inverse time current relays are used for the protection of


   A. Feeders

   B. Transformers

   C. Alternators

   D. Both A and B


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D. Both A and B

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4.  IDMT relays are used to protect the power transformers against


   A. External short-circuit

   B. Over loads

   C. Internal short-circuits

   D. Both A and B


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D. Both A and B

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5.  In distance protection, the relay measures


   A. Negative sequence impedance of the light from relay up to the fault point

   B. Positive sequence impedance of the line from relay up to the fault point

   C. Self impedance of the line from relay up to the fault point

   D. Zero sequence impedance of the line from relay up to the fault point


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B. Positive sequence impedance of the line from relay up to the fault point

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