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MCQs

Total Questions : 206 | Page 4 of 21 pages
Question 31. A.C. network analyzer is used to solve problems of
  1.    Load flow
  2.    Load flow and short-circuit
  3.    Load flow and stability
  4.    Load flow, short-circuit and stability
 Discuss Question
Answer: Option D. -> Load flow, short-circuit and stability
Question 32. Interruption of large currents by relay requires
  1.    arc suppressing blow out coils
  2.    wide separation of the opened contacts
  3.    high speed opening of contacts
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 33. In Railway applications ______ circuit breaker is used.
  1.    SFe
  2.    bulk oil
  3.    minimum oil
  4.    air break
 Discuss Question
Answer: Option D. -> air break
Question 34. A short-circuit is identified by
  1.    no current flow
  2.    heavy current flow
  3.    voltage drop
  4.    voltage rise
 Discuss Question
Answer: Option B. -> heavy current flow
Question 35. The fuse wire, in D.C. circuits, is inserted in
  1.    negative circuit only
  2.    positive circuit only
  3.    both (A) and (B)
  4.    either (A) or (B)
 Discuss Question
Answer: Option C. -> both (A) and (B)
Question 36. The fuse rating is expressed in terms of
  1.    current
  2.    voltage
  3.    VAR
  4.    kVA
 Discuss Question
Answer: Option A. -> current
Question 37. Magnetic circuit breaker has ______ trip action.
  1.    delayed
  2.    instantaneous
  3.    both of the above
  4.    none of the above
 Discuss Question
Answer: Option B. -> instantaneous
Question 38. The arcing contacts in a circuit breaker are made of
  1.    copper tungsten alloy
  2.    porcelain
  3.    electrolytic copper
  4.    aluminium alloy
 Discuss Question
Answer: Option A. -> copper tungsten alloy
Question 39. In a circuit breaker the basic problem is to
  1.    maintain the arc
  2.    extinguish the arc
  3.    transmit large power
  4.    emit the ionizing electrons
 Discuss Question
Answer: Option B. -> extinguish the arc
Question 40. The steady state stability of the power system can be increased by
  1.    Connecting lines in parallel
  2.    Connecting lines in series
  3.    Using machines of high impedance
  4.    Reducing the excitation of machines
 Discuss Question
Answer: Option A. -> Connecting lines in parallel

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