- A. fuses
- B. relays
- C. fast switches
- D. circuit breakers
Switchgear Protections
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Fault diverters are basically
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Directional relays are based on flow of
- A. power
- B. current
- C. voltage wave
- D. all of the above
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Large internal faults are protected by
- A. merz price percentage differential protection
- B. mho and ohm relays
- C. horn gaps and temperature relays
- D. earth fault and positive sequence relays
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For which of the following ratings of the transformer differential protection is recommended ?
- A. above 30 kV
- B. equal to and above 5 MVA
- C. equal to and above 25 MVA
- D. none of the above
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The delay fuses are used for the protection of ________ .
- A. motors
- B. power outlet circuits
- C. fluorescent lamps
- D. light circuits
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In a single bus-bar system there will be complete shut down when
- A. fault occurs on the bus itself
- B. fault occurs on neutral line
- C. two or more faults occur simultaneously
- D. fault occurs with respect to earthing
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Overload relays are of type.
- A. induction
- B. solid state
- C. thermal
- D. electromagnetic
- E. all above
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To protect most of the electrical equipment handling low power, the types of relays used are
- A. Thermocouple
- B. Electronic and bimetallic
- C. Both (A) and (B)
- D. None of the above
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When a wave propagates on a transmission line, it suffers reflection several times at
- A. tapping
- B. load end
- C. sending end
- D. sending and other end
- E. all of the above
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D.C. 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