D. C. Generators MCQs with answers Page - 4

Here, you will find a collection of MCQ questions on D. C. Generators. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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A

Admin • 802.91K Points
Coach

Q. The resistance of armature winding depends on

  • (A) length of conductor
  • (B) cross-sectional area of the conductor
  • (C) number of conductors
  • (D) all of the above

A

Admin • 802.91K Points
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Q. The field coils of D.C. generator are usually made of

  • (A) mica
  • (B) copper
  • (C) cast iron
  • (D) carbon

A

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Q. The commutator segments are connected to the armature conductors by means of

  • (A) copper lugs
  • (B) resistance wires
  • (C) insulation pads
  • (D) brazing

A

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Q. In a commutator

  • (A) copper is harder than mica
  • (B) mica and copper are equally hard
  • (C) mica is harder than copper
  • (D) none of the above

A

Admin • 802.91K Points
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Q. In D.C. generators the pole shoes are fastened to the pole core by

  • (A) rivets
  • (B) counter sunk screws
  • (C) brazing
  • (D) welding

A

Admin • 802.91K Points
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Q. Satisfactory commutation of D.C. machines requires

  • (A) brushes should be of proper grade and size
  • (B) brushes should smoothly run in the holders
  • (C) smooth, concentric commutator properly undercut
  • (D) all of the above

A

Admin • 802.91K Points
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Q. The bearings used to support the rotor shafts are generally

  • (A) ball bearings
  • (B) bush bearings
  • (C) magnetic bearmgs
  • (D) needle bearings

A

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Q. In D.C. generators, the cause of rapid brush wear may be

  • (A) severe sparking
  • (B) rough commutator surface
  • (C) imperfect contact
  • (D) any of the above

A

Admin • 802.91K Points
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Q. In lap winding, the number of brushes is always

  • (A) double the number of poles
  • (B) same as the number of poles
  • (C) half the number of poles
  • (D) two

A

Admin • 802.91K Points
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Q. In a four-pole D.C. machine

  • (A) all the four poles are north poles
  • (B) alternate poles are north and south
  • (C) all the four poles are south poles
  • (D) two north poles follow two south poles

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