D. C. Generators MCQs with answers Page - 10

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Q. In a D.C. generator

  • (A) external resistance = internal char-acteristic - armature reaction
  • (B) internal characteristic = magnetisation characteristic - ohmic drop
  • (C) external characteristic = magnetisation characteristic - ohmic drop - armature reaction
  • (D) magnetisation characteristic = external characteristic

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Q. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave

  • (A) will be zero
  • (B) will be of 5 Hz
  • (C) willbeof5xiVHz
  • (D) will be of v Hz 5

A

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Q. In a separately excited generator supplying rated load the armature reaction ,

  • (A) is always present
  • (B) is always absent
  • (C) may be sometimes present
  • (D) none of the above

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Q. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be

  • (A) zero
  • (B) small
  • (C) the same as rated voltage
  • (D) high

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Q. Armature reaction in a generator results in

  • (A) demagnetisation of leading pole tip and magnetisation of trailing pole tip
  • (B) demagnetisation of trailing pole tip and magnetisation of leading pole tip
  • (C) damagnetising the centre of all poles
  • (D) magnetising the centre of all poles

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Q. 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.

  • (A) Series field
  • (B) Compensating field
  • (C) Inter pole field
  • (D) Shunt field

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Q. Wave winding is composed of

  • (A) any even number of conductors
  • (B) any odd number of conductors
  • (C) that even number which is exact multiple of poles + 2
  • (D) that even number which is exact multiple of poles

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Q. The critical resistance of the D.C. generator is the resistance of

  • (A) field
  • (B) brushes
  • (C) armature
  • (D) load

A

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Q. When two D.C. series generators are running in parallel, an equilizer bar is used

  • (A) to increase the speed and hence generated e.m.f.
  • (B) to increase the series flux
  • (C) so that two similar machines will pass approximately equal currents to the load
  • (D) to reduce the combined effect of ar-mature reaction of both machines

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Q. Which of the following generating machine will offer constant voltage on all loads ?

  • (A) Self-excited generator
  • (B) Separately excited generator
  • (C) Level compounded generator .
  • (D) All of the above

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