Testing and Commissioning of Electrical Equipments (2180901) MCQs

MCQs of Switch gear and Protective devices

Showing 31 to 40 out of 59 Questions
1 2 3 4 5 6
31.
The number of cycles in which a high-speed circuit breaker can complete its operation is
(a) 3 to 8
(b) 10 to 18
(c) 20 to 30
(d) 40 to 50
Answer:

Option (a)

32.
Breaking capacity of a circuit breaker is usually expressed in terms of
(a) Volts
(b) MW
(c) Amperes
(d) MVA
Answer:

Option (d)

33.
Part of the circuit breaker helpful in breaking the current is
(a) Trip Coil
(b) Contacts
(c) Handle
(d) Medium
Answer:

Option (b)

34.
For single frequency transients, ratio of peak restriking voltage to time between voltage zero and peak voltage is called
(a) Restriking voltage
(b) Recovery voltage
(c) Rate of rising restriking voltage
(d) Active recovery voltage
Answer:

Option (c)

35.
Which of the following are not included in maintenance schedule of CB?
(a) pre-commissioning check
(b) Insulation resistance check
(c) Leakage check
(d) timing check
Answer:

Option (a)

36.
How we can check the mechanical operation of CB during maintenance?
(a) Manual Command
(b) Energizing relay
(c) Manual Command and Energizing relay
(d) live operation
Answer:

Option (c)

37.
Contacts (main and moving) of CB are checked _________ in year for normal duty but ___________ in case of heavy duty.
(a) Once, Once
(b) Once, half-yearly
(c) Once, monthly
(d) Once, quarterly
Answer:

Option (d)

38.
Arc control devices of CB are checked _________ in year for normal duty but ___________ in case of heavy duty.
(a) Once, Once
(b) Once, half-yearly
(c) Once, monthly
(d) Once, quarterly
Answer:

Option (b)

39.
Connecting Roads and Levers of CB are checked _________
(a) Once in year
(b) half-yearly
(c) monthly
(d) quarterly
Answer:

Option (b)

40.
Oil level gauge of CB are checked _________
(a) Once in year
(b) half-yearly
(c) monthly
(d) quarterly
Answer:

Option (d)

Showing 31 to 40 out of 59 Questions
1 2 3 4 5 6