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MCQs

Total Questions : 1232 | Page 6 of 124 pages
Question 51. A Weston frequency meter is
  1.    moving coil instrument
  2.    moving iron instrument
  3.    dynamometer instrument
  4.    none of the above
 Discuss Question
Answer: Option B. -> moving iron instrument
Question 52. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
  1.    deflecting
  2.    controlling
  3.    damping
  4.    any of the above
 Discuss Question
Answer: Option C. -> damping
Question 53. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
  1.    increase
  2.    decrease
  3.    either of the above
  4.    none of the above
 Discuss Question
Answer: Option A. -> increase
Question 54. For measurement of mutual inductance we can use
  1.    Anderson bridge
  2.    Maxwell’s bridge
  3.    Heaviside bridge
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Heaviside bridge
Question 55. In a low power factor wattmeter the compensating coil is connected
  1.    in series with current coil
  2.    in parallel with current coil
  3.    in series with pressure coil
  4.    in parallel with pressure coil
 Discuss Question
Answer: Option C. -> in series with pressure coil
Question 56. Which of the following devices may be used for extending the range of instruments ?
  1.    Shunts
  2.    Multipliers
  3.    Current transformers
  4.    Potential transformers
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 57. The operating voltage of a meggar is about
  1.    6 V
  2.    12 V
  3.    40 V
  4.    100 V
 Discuss Question
Answer: Option D. -> 100 V
Question 58. Which of the following brushes can be used for high values of current density ?
  1.    Metal graphite brushes
  2.    Hard carbon brushes
  3.    Electro-graphitic brushes
  4.    Natural graphite brushes
 Discuss Question
Answer: Option A. -> Metal graphite brushes
Question 59. Which of the following is an advantage of hydrogen cooling?
  1.    Increase in efficiency
  2.    Increase in ratings
  3.    Increase in life
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 60. The insulation between windings and grounded core and the insulation between the windings of the same phase is
  1.    minor insulation
  2.    major insulation
  3.    either of the above
  4.    none of the above
 Discuss Question
Answer: Option A. -> minor insulation

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