Relay | Protective Relay Objective Type Questions and answers

16.  How many relays are used to detect interphase fault of a three line system?

   A. One

   B. Two

   C. Three

   D. Six

17.  Which is the main relay for protecting up to 90% of the transmission line-length in the forward direction?

   A. Directional over current relay

   B. Mho relay

   C. Carrier current protective relay

   D. Impedance relay

18.  For protection of parallel feeders fed from one end, the relays required are

   A. Nondirectional relays at the source end and directional relay at the load end

   B. Nondirectional relay at both ends

   C. Directional relay at source end and nondirectional relay at load end

   D. Directional relay at both ends

19.  Relays can be designed to respond to changes in

   A. Resistance, reactance or impedance

   B. Voltage and current

   C. Light intensity

   D. All of the above

20.  DC shunt relays are made of

   A. Few turns of thin wire

   B. Few turns of thick wire

   C. Many turns of thin wire

   D. Many turns of thick wire

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