Testing and Commissioning of Electrical Equipments (2180901) MCQs

MCQs of Switch gear and Protective devices

Showing 11 to 20 out of 59 Questions
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11.
Which of the following are the correct description of the switchgear and protective device Standards?
(a) Circuit breaker up to 1000 V - IS 2516 (1985)
(b) HT AC Circuit breaker - IS 13118 (1991)
(c) SPECIFICATION FOR LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - IS 8623 (1993)
(d) All of these
Answer:

Option (d)

12.
Basic classification of the Circuit breaker is based on
(a) Nature of Supply - AC or DC
(b) System Voltage - LT or HT
(c) Arc quenching medium used - Air, Vacuum, Oil or SF6
(d) All of these
Answer:

Option (d)

13.
Which of the following is not an LT Circuit breaker?
(a) Oil CB
(b) miniature CB
(c) moulded Case CB
(d) Earth Leakage CB
Answer:

Option (a)

14.
Which of the following is not an HT Circuit breaker?
(a) Vacuum CB
(b) Oil CB
(c) SF6 CB
(d) Miniature CB
Answer:

Option (d)

15.
Which of the following is not an LT Circuit breaker?
(a) 11 kV
(b) 1000 V
(c) 400 V
(d) 220 V
Answer:

Option (b)

16.
The fault clearing time of a circuit breaker is usually
(a) few cycles of supply voltage
(b) one second
(c) few seconds
(d) few minutes
Answer:

Option (a)

17.
Which of the following circuit breakers is preferred for EHT application
(a) Bulk oil circuit breakers
(b) Minimum oil circuit breakers
(c) SF₆
(d) Air blast circuit breakers
Answer:

Option (c)

18.
For high voltage, ac circuit breakers, the rated short circuit current is passed for
(a) 10 seconds.
(b) 1 sec
(c) 0.1 seconds
(d) 0.01 sec
Answer:

Option (b)

19.
Out of the following circuit breakers, which one has the lowest voltage range
(a) Air-blast circuit breaker
(b) Tank type oil circuit breaker
(c) Air-break circuit breaker
(d) SF₆ circuit breaker
Answer:

Option (c)

20.
Rated voltage – The rated maximum voltage of the circuit breaker is the highest __________ , above nominal voltage for which the circuit breaker is designed and is the upper limits for operation.
(a) RMS voltage
(b) Peak voltage
(c) DC voltage
(d) All of these
Answer:

Option (a)

Showing 11 to 20 out of 59 Questions
1 2 3 4 5 6