D.C. Generators MCQs | Page - 8

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M

Mr. Dubey • 97.30K Points
Coach

Q. For the parallel operation of two or more D.C. compound generators, we should ensure that

  • (A) voltage of the incoming generator should be same as that of bus bar
  • (B) polarity of incoming generator should be same as that of bus bar
  • (C) all the series fields should be run in parallel by means of equilizer connection
  • (D) series fields of all generators should be either on positive side or negative side of the armature
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M

Mr. Dubey • 97.30K Points
Coach

Q. Interpole flux should be sufficient to

  • (A) neutralise the commutating self induced e.m.f.
  • (B) neutralise the armature reaction flux
  • (C) neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
  • (D) perform none of the above functions
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M

Mr. Dubey • 97.30K Points
Coach

Q. D.C. generator generally preferred for charging automobile batteries is

  • (A) series generator
  • (B) shunt generator
  • (C) long shunt compound generator
  • (D) any of'the above
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M

Mr. Dubey • 97.30K Points
Coach

Q. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when

  • (A) r.p.m. is more than 300
  • (B) r.p.m. is less than 300
  • (C) number of poles is 4
  • (D) number of poles is 2
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M

Mr. Dubey • 97.30K Points
Coach

Q. In D.C. generators the polarity of the interpoles

  • (A) is the same as that of the main pole ahead
  • (B) is the same as that of the immediately preceding pole
  • (C) is opposite to that of the main pole ahead
  • (D) is neutral as these poles do not play part in generating e.m.f.
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M

Mr. Dubey • 97.30K Points
Coach

Q. The e.m.f. generated in a D.C. generator is directly proportional to

  • (A) flux/pole
  • (B) speed of armature
  • (C) number of poles
  • (D) all of the above
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M

Mr. Dubey • 97.30K Points
Coach

Q. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except

  • (A) interpoles
  • (B) dummy coils
  • (C) compensating winding
  • (D) shifting of axis of brushes
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M

Mr. Dubey • 97.30K Points
Coach

Q. In D.C. generators on no-load, the air gap flux distribution in space is

  • (A) sinusoidal
  • (B) triangular
  • (C) pulsating
  • (D) flat topped
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M

Mr. Dubey • 97.30K Points
Coach

Q. The purpose of providing dummy coils in a generator is

  • (A) to reduce eddy current losses
  • (B) to enhance flux density
  • (C) to amplify voltage
  • (D) to provide mechanical balance for the rotor
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