[amp_mcq option1=”neutral wire” option2=”negative of D.” option3=”circuit C. positive of” option4=”phase dine” correct=”option1″]
Switchgear protections
32. Circuit breakers usually operate under
[amp_mcq option1=”transient state of short-circuit current” option2=”sub-transient state of short-circuit current” option3=”steady state of short-circuit current” option4=”after D. C. component has ceased” correct=”option1″]
33. Thermal overload relays are used to protect the motor against over current due to
[amp_mcq option1=”short-circuits” option2=”heavy loads” option3=”grounds” option4=”all of the above” correct=”option1″]
Detailed SolutionThermal overload relays are used to protect the motor against over current due to
34. The torque produced in induction type relay (shaded pole structure) is
[amp_mcq option1=”inversely proportional to the current” option2=”inversely proportional to the square of the current” option3=”proportional to the current” option4=”proportional to square of the current” correct=”option3″]
Detailed SolutionThe torque produced in induction type relay (shaded pole structure) is
35. The fuse wire, in D.C. circuits, is inserted in
[amp_mcq option1=”negative circuit only” option2=”positive circuit only” option3=”circuits, is inserted in A. negative circuit only B. positive circuit only C. both (A) and (B)” option4=”either (A) or (B)” correct=”option4″]
Detailed SolutionThe fuse wire, in D.C. circuits, is inserted in
36. H.R.C. fuse, as compared to a rewirable fuse, has
[amp_mcq option1=”no ageing effect” option2=”high speed of operation” option3=”fuse, as compared to a rewirable fuse, has A. no ageing effect B. high speed of operation C. high rupturing capacity” option4=”all of the above” correct=”option4″]
Detailed SolutionH.R.C. fuse, as compared to a rewirable fuse, has
37. The under voltage relay can be used for
[amp_mcq option1=”generators” option2=”busbars” option3=”transformers” option4=”motors E. all of the above” correct=”option1″]
38. The ground wire should not be smaller than No ______ copper.
[amp_mcq option1=”2″ option2=”4″ option3=”6″ option4=”10″ correct=”option1″]
Detailed SolutionThe ground wire should not be smaller than No ______ copper.
39. Air blast circuit breakers for 400 kV power system are designed to operate in
[amp_mcq option1=”100 microsecond” option2=”50 millisecond” option3=”0.5 sec” option4=”0.1 sec” correct=”option1″]
Detailed SolutionAir blast circuit breakers for 400 kV power system are designed to operate in
40. The arc voltage produced in
[amp_mcq option1=”In phase with the arc current” option2=”Lagging the arc current by 90°” option3=”circuit breaker is always A. In phase with the arc current B. Lagging the arc current by 90° C. Leading the arc current by 90°” option4=”None of the above” correct=”option4″]