D. C. Generators MCQs with answers Page - 3

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A

Admin • 831.35K Points
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Q. Eddy currents are induced in the pole shoes of a D.C. machine due to

  • (A) oscillating magnetic field
  • (B) pulsating magnetic flux
  • (C) relative rotation between field and armature
  • (D) all above

A

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Q. Equilizer rings are required in case armature is

  • (A) wave wound
  • (B) lap wound
  • (C) delta wound
  • (D) duplex wound

A

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Q. Flashing the field of D.C. generator means

  • (A) neutralising residual magnetism
  • (B) creating residual magnetism by a D.C. source
  • (C) making the magnetic losses of forces parallel
  • (D) increasing flux density by adding extra turns of windings on poles

A

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Q. Following D.C. generator will be in a position to build up without any residual magnetism in the poles

  • (A) series generator
  • (B) shunt generator
  • (C) compound generator
  • (D) self-excited generator

A

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Q. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

  • (A) Lap winding
  • (B) Wave winding
  • (C) Either of (a) and (b) above
  • (D) Depends on other features of design

A

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Q. For a D.C. machines laboratory following type of D.C. supply will be suitable

  • (A) rotary converter
  • (B) mercury are rectifier
  • (C) induction motor D.C. generator set
  • (D) synchronous motor D.C. generator set

A

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Q. For both lap and wave windings, there are as many commutator bars as the number of

  • (A) slots
  • (B) armature conductors
  • (C) winding elements
  • (D) poles

A

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Q. Laminations of core are generally made of

  • (A) case iron
  • (B) carbon
  • (C) silicon steel
  • (D) stainless steel

A

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Q. Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?

  • (A) 0.005 mm
  • (B) 0.05 mm
  • (C) 0.5 m
  • (D) 5 m

A

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Q. The armature of D.C. generator is laminated to

  • (A) reduce the bulk
  • (B) provide the bulk
  • (C) insulate the core
  • (D) reduce eddy current loss

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