D. C. Generators MCQs with answers Page - 6

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Admin • 831.35K Points
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Q. Welding generator will have

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

A

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Q. In case of D.C. machine winding, number of commutator segments is equal to

  • (A) number of armature coils
  • (B) number of armature coil sides
  • (C) number of armature conductors
  • (D) number of armature turns

A

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Q. The function of pole shoes in the case of D.C. machine is

  • (A) to reduce the reluctance of the magnetic path
  • (B) to spread out the flux to achieve uniform flux density
  • (C) to support the field coil
  • (D) to discharge all the above functions

A

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Q. In the case of lap winding resultant pitch is

  • (A) multiplication of front and back pitches
  • (B) division of front pitch by back pitch
  • (C) sum of front and back pitches
  • (D) difference of front and back pitches

A

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Q. Which of the following statement about D.C. generators is false ?

  • (A) Compensating winding in a D.C. machine helps in commutation
  • (B) In a D. C. generator interpoles winding is connected in series with the armature winding
  • (C) Back pitch and front pitch are both odd and approximately equal to the pole pitch
  • (D) Equilizing bus bars are used with parallel running of D.C. shunt generators

A

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Q. The demagnetising component of armature reaction in a D.C. generator

  • (A) reduces generator e.m.f.
  • (B) increases armature speed
  • (C) reduces interpoles flux density
  • (D) results in sparking trouble

A

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Q. Magnetic field in a D.C. generator is produced by

  • (A) electromagnets
  • (B) permanent magnets
  • (C) both (a) and (b)
  • (D) none of the above

A

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Q. The number of brushes in a commutator depends on

  • (A) speed of armature
  • (B) type of winding
  • (C) voltage
  • (D) amount of current to be collected

A

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Q. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?

  • (A) Dummy coils
  • (B) Commutator
  • (C) Eye bolt
  • (D) Equilizer rings

A

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Q. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by

  • (A) using conductor of annealed copper
  • (B) using commutator with large number of segments
  • (C) using carbon brushes of superior quality
  • (D) using equiliser rings

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