Switchgear protections Archives - Page 6 of 10 - MCQ and Quiz for Exams

51. Wave trap is used to trap waves of

power frequencies

higher frequencies entering generator or transformer units

either of the above

none of the above

Detailed SolutionWave trap is used to trap waves of

52. Circuit breakers are essentially

current carrying contacts called electrodes

arc extinguishers

circuits to break the system

transformers to isolate the two systems E. any of the above

Detailed SolutionCircuit breakers are essentially

53. SF6 gas

Is yellow in colour

Is lighter than air

Is nontoxic

Has pungent small E. None of the above

Detailed SolutionSF6 gas

54. Induction cup relay is operated due to changes in

current

voltage

impedance

all of the above

Detailed SolutionInduction cup relay is operated due to changes in

55. The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

recovery

surge

operating

arc E. none of the above

Detailed SolutionThe voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

56. A fuse is connected

in series with circuit

in parallel with circuit

either in series or in parallel with circuit

none of the above

Detailed SolutionA fuse is connected

57. Overload relays are of type.

induction

solid state

thermal

electromagnetic E. all above

Detailed SolutionOverload relays are of type.

58. The delay fuses are used for the protection of ________ .

motors

power outlet circuits

fluorescent lamps

light circuits

Detailed SolutionThe delay fuses are used for the protection of ________ .

59. Discrimination between main and back up protection is provided by the use of relays which are

fact

sensitive

slow

none of the above

Detailed SolutionDiscrimination between main and back up protection is provided by the use of relays which are

60. Fault diverters are basically

fuses

relays

fast switches

circuit breakers

Detailed SolutionFault diverters are basically

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