Switchgear And Protection | Switchgear And Protection Objective Type Questions and answers
11. Problems associated with differential protection is/are
A. Magnetising inrush current
B. Mismatching characteristics of CTs
C. Charge of ratio as a result of tapping
D. All of the above
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D. All of the above
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12. For the protection of transformers, harmonic restraint is used to guard against
A. Magnetising inrush current
B. Unbalanced operation
C. Lightning
D. Switching over-voltage
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13. The types of faults that occur in electric motors are
A. Stator
B. Rotor
C. Overload
D. All of the above
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14. The main function of under voltage protective device generally employed with a motor starter is to
A. Open the supply circuit on failure of power supply
B. Control the motor voltage
C. Prevent the opening of supply circuit
D. None of the above
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15. The bias factor S in unit protection synchronous generators
A. Lies between .05 and .1 pu
B. Is less than .05 pu
C. Lies between .1 to .25 pu
D. Is greater than .025 pu
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