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MCQs

Total Questions : 377 | Page 7 of 38 pages
Question 61. In a D.C. generator the critical resistance can be increased by
  1.    Increasing its field resistance
  2.    Decreasing its field resistance
  3.    Increasing its speed
  4.    Decreasing its speed
 Discuss Question
Answer: Option C. -> Increasing its speed
Question 62. Eddy currents are induced in the pole shoes of a D.C. machine due to
  1.    Oscillating magnetic field
  2.    Pulsating magnetic flux
  3.    Relative rotation between field and armature
  4.    All above
 Discuss Question
Answer: Option C. -> Relative rotation between field and armature
Question 63. In a D.C. machine, short-circuited field coil will result in
  1.    odour of barning insulation
  2.    unbalanced magnetic pull producing vibrations
  3.    reduction of generated voltage for which excitation has to be increased to maintain the voltage
  4.    all above
 Discuss Question
Answer: Option D. -> all above
Question 64. The demagnetizing component of armature reaction in a D.C. generator
  1.    Reduces generator e.m.f.
  2.    Increases armature speed
  3.    Reduces interpoles flux density
  4.    Results in sparking trouble
 Discuss Question
Answer: Option A. -> Reduces generator e.m.f.
Question 65. Welding generator will have
  1.    Lap winding
  2.    Wave winding
  3.    Delta winding
  4.    Duplex wave winding
 Discuss Question
Answer: Option A. -> Lap winding
Question 66. Equalizer rings are required in case armature is
  1.    Wave wound
  2.    Lap wound
  3.    Delta wound
  4.    Duplex wound
 Discuss Question
Answer: Option B. -> Lap wound
Question 67. According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of
  1.    Motion of conductor
  2.    Lines of force
  3.    Either of the above
  4.    None of the above
 Discuss Question
Answer: Option B. -> Lines of force
Question 68. Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
  1.    Series field
  2.    Compensating field
  3.    Inter pole field
  4.    Shunt field
 Discuss Question
Answer: Option D. -> Shunt field
Question 69. The essential condition for parallel operation of two D.C. generators is that they have
  1.    same kW rating
  2.    the same operation r.p.m.
  3.    the same drooping voltage characteristics
  4.    same percentage regulation
 Discuss Question
Answer: Option C. -> the same drooping voltage characteristics
Question 70. A D.C. generator works on the principle of
  1.    Lenz's law
  2.    Ohm's law
  3.    Faraday's law of electromagnetic induction
  4.    None of the above
 Discuss Question
Answer: Option C. -> Faraday's law of electromagnetic induction

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