Testing and Commissioning of Electrical Equipments (2180901) MCQs

MCQs of Switch gear and Protective devices

Showing 41 to 50 out of 59 Questions
2 3 4 5 6
41.
Closing and Tripping mechanism of CB are checked _________
(a) Yearly
(b) half-yearly
(c) monthly
(d) quarterly
Answer:

Option (a)

42.
Realy Setting of CB are checked _________
(a) Yearly
(b) half-yearly
(c) monthly
(d) quarterly
Answer:

Option (b)

43.
Insulating oil of CB are checked _________ for normal duty but ___________ in case of heavy duty.
(a) Yearly, Yearly
(b) Yearly, half-yearly
(c) Yearly, monthly
(d) Yearly, quarterly
Answer:

Option (b)

44.
Relay coil does not trip. which of the following is not a suitable reason?
(a) Carbonised or burn contact
(b) Battery discharged
(c) Low spring tension
(d) Relay contact not proper
Answer:

Option (a)

45.
Opening of CB is too slow. which of the following is not a suitable reason?
(a) More friction in pole unit
(b) Contact grip is too high
(c) Low battery voltage
(d) Oil contaminated
Answer:

Option (d)

46.
One of the poles does not close in CB. which of the following is not a suitable reason?
(a) Damaged pull rod
(b) Moisture deposits
(c) Link might be broken
(d) COntact of the pole may be damaged
Answer:

Option (b)

47.
The resistance between terminals of poles is too high in CB. which of the following is not a suitable reason?
(a) Contact surface damaged
(b) Contact pressure reduced
(c) Moisture deposited
(d) Oxide film on the contact surface
Answer:

Option (c)

48.
Maintenance frequency of CB is/are depends on which of the following?
(a) Frequency of operation
(b) atmospheric condition
(c) high fault level
(d) All of these
Answer:

Option (d)

49.
Which of the following is not a type test of CB?
(a) Temprature rise test
(b) Short Circuit making/breaking test
(c) rated short-time withstand the test
(d) Mechanical operation test
Answer:

Option (d)

50.
Which of the following is not a type test of CB?
(a) Dielectric test
(b) electrical endurance test
(c) verification of overload performance
(d) DC resistance mesurement
Answer:

Option (d)

Showing 41 to 50 out of 59 Questions
2 3 4 5 6