[amp_mcq option1=”Induction type” option2=”Reactance” option3=”Impedance” option4=”None of the above” correct=”option3″]
Detailed Solution________ relay is preferred for phase fault on short transmission line.
Switchgear protections
12. The information to the circuit breaker under fault conditions is provided by
[amp_mcq option1=”relay” option2=”rewirable fuse” option3=”H.R.’only” option4=”all of the above” correct=”option4″]
Detailed SolutionThe information to the circuit breaker under fault conditions is provided by
13. A switchgear is device used for
[amp_mcq option1=”Interrupting an electrical circuit” option2=”Switching an electrical circuit” option3=”Switching and controlling an electrical circuit” option4=”Switching, controlling and protecting the electrical circuit and equipment” correct=”option4″]
14. For which of the following ratings of the transformer differential protection is recommended ?
[amp_mcq option1=”above 30 kV” option2=”equal to and above 5 MVA” option3=”equal to and above 25 MVA” option4=”none of the above” correct=”option2″]
15. Which of the following is the least expensive protection for overcurrent is low voltage system ?
[amp_mcq option1=”Rewireable fuse” option2=”Isolator” option3=”Oil circuit breaker” option4=”Air break circuit breaker E. None of the above” correct=”option1″]
16. The power loss is an important factor for the design of
[amp_mcq option1=”transmission line” option2=”motor” option3=”generator” option4=”feeder” correct=”option1″]
Detailed SolutionThe power loss is an important factor for the design of
17. The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
[amp_mcq option1=”lubricate the contacts” option2=”insulate the contacts from switch body” option3=”extinguish the arc” option4=”all of the above E. none of the above” correct=”option4″]
18. Bus coupler is very essential in arrangement
[amp_mcq option1=”single bus” option2=”double bus, double breaker” option3=”main and transfer bus” option4=”all of the above” correct=”option4″]
Detailed SolutionBus coupler is very essential in arrangement
19. A fuse in a motor circuit provides protection against
[amp_mcq option1=”overload” option2=”short-circuit and overload” option3=”open circuit, short-circuit and overload” option4=”none of the above” correct=”option2″]
Detailed SolutionA fuse in a motor circuit provides protection against
20. To protect most of the electrical equipment handling low power, the types of relays used are
[amp_mcq option1=”Thermocouple” option2=”Electronic and bimetallic” option3=”Both (A) and (B)” option4=”None of the above” correct=”option3″]