Switchgear Protections(Electrical Engineering ) Questions and Answers

Question 1. Fault diverters are basically
  1.    fuses
  2.    relays
  3.    fast switches
  4.    circuit breakers
Explanation:-
Answer: Option C. -> fast switches
Question 2. On which of the following routine tests are conducted ?
  1.    Oil circuit breakers
  2.    Air blast circuit breakers
  3.    Minimum oil circuit breakers
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 3. Relays are used for phase faults on long line.
  1.    Impedance
  2.    Reactance
  3.    Either of the above
  4.    None of the above
Explanation:-
Answer: Option A. -> Impedance
Question 4. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
  1.    Radiation
  2.    Convection
  3.    Conduction
  4.    All of the above
Explanation:-
Answer: Option C. -> Conduction
Question 5. Relays can be designed to respond to changes in
  1.    resistance, reactance or impedance
  2.    voltage and current
  3.    light intensity
  4.    temperature
  5.    all above
Explanation:-
Answer: Option E. -> all above
Question 6. Which of the following is the least expensive protection for overcurrent is low voltage system ?
  1.    Rewireable fuse
  2.    Isolator
  3.    Oil circuit breaker
  4.    Air break circuit breaker
  5.    None of the above
Explanation:-
Answer: Option A. -> Rewireable fuse
Question 7. Circuit breakers are essentially
  1.    current carrying contacts called electrodes
  2.    arc extinguishers
  3.    circuits to break the system
  4.    transformers to isolate the two systems
  5.    any of the above
Explanation:-
Answer: Option A. -> current carrying contacts called electrodes
Question 8. The interaction between a transmission line and communication line is minimized by
  1.    transposing transmission as well as communication lines
  2.    increasing the height of the trans-mission line tower
  3.    increasing the distance between the two lines
  4.    all of the above
Explanation:-
Answer: Option D. -> all of the above
Question 9. A transmission line is protected by
  1.    Inrush protection
  2.    Distance protection
  3.    Time graded and current graded over current protection
  4.    Both (B) and (C)
Explanation:-
Answer: Option D. -> Both (B) and (C)
Question 10. The arc voltage produced in A.C. circuit breaker is always
  1.    In phase with the arc current
  2.    Lagging the arc current by 90°
  3.    Leading the arc current by 90°
  4.    None of the above
Explanation:-
Answer: Option A. -> In phase with the arc current
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