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MCQs

Total Questions : 206 | Page 6 of 21 pages
Question 51. When a transmission line is energized, the wave that propagates on it is
  1.    current wave only
  2.    voltage wave only
  3.    both (A) and (B)
  4.    power factor wave only
 Discuss Question
Answer: Option C. -> both (A) and (B)
Question 52. Overload relays are of type.
  1.    induction
  2.    solid state
  3.    thermal
  4.    electromagnetic
  5.    all above
 Discuss Question
Answer: Option E. -> all above
Question 53. H.R.C. fuse, as compared to a rewirable fuse, has
  1.    no ageing effect
  2.    high speed of operation
  3.    high rupturing capacity
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 54. The inverse definite mean time relays are used for over current and earth fault protection of transformer against
  1.    heavy loads
  2.    internal short-circuits
  3.    external short-circuits
  4.    all of the above
 Discuss Question
Answer: Option B. -> internal short-circuits
Question 55. Which of the following devices will receive voltage surge first travelling on the transmission line ?
  1.    Lightning arresters
  2.    Relays
  3.    Step-down transformer
  4.    Switchgear
 Discuss Question
Answer: Option A. -> Lightning arresters
Question 56. The relay with inverse time characteristic will operate within
  1.    1.5 sec
  2.    5 to 10 sec
  3.    5 to 20 sec
  4.    20 to 30 sec
  5.    none of the above
 Discuss Question
Answer: Option B. -> 5 to 10 sec
Question 57. Arc in a circuit behaves as
  1.    a capackive reactance
  2.    an inductive reactance
  3.    a resistance increasing with voltage rise across the arc
  4.    a resistance decreasing with voltage rise across the arc
 Discuss Question
Answer: Option D. -> a resistance decreasing with voltage rise across the arc
Question 58. A fuse is connected
  1.    in series with circuit
  2.    in parallel with circuit
  3.    either in series or in parallel with circuit
  4.    none of the above
 Discuss Question
Answer: Option A. -> in series with circuit
Question 59. The reflection co-efficient at the open circuited end of a transmission line.
  1.    zero
  2.    infinity
  3.    unity
  4.    none of the above
 Discuss Question
Answer: Option C. -> unity
Question 60. Protection by fuses is generally not used beyond
  1.    20 A
  2.    50 A
  3.    100 A
  4.    200 A
 Discuss Question
Answer: Option C. -> 100 A

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