D. C. Generators MCQs with answers Page - 7

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Q. In D.C. generators, lap winding is used for

  • (A) high voltage, high current
  • (B) low voltage, high current
  • (C) high voltage, low current
  • (D) low voltage, low current

A

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Q. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be

  • (A) 2 : 3
  • (B) 3 : 1
  • (C) 3 : 2
  • (D) 1 : 3

A

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Q. The voltage drop for which of the following types of brush can be expected to be least ?

  • (A) Graphite brushes
  • (B) Carbon brushes
  • (C) Metal graphite brushes
  • (D) None of the above

A

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Q. The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be

  • (A) E/2
  • (B) 2E
  • (C) slightly less than E
  • (D) E

A

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Q. The armature core of a D.C. generator is usually made of

  • (A) silicon steel
  • (B) copper
  • (C) non-ferrous material
  • (D) cast-iron

A

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Q. Open circuited armature coil of a D.C. machine is

  • (A) identified by the scarring of the commutator segment to which open circuited coil is connected
  • (B) indicated by a spark completely around the commutator
  • (C) both (a) and (b)
  • (D) none of the above

A

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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

A

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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

A

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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

A

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Q. Permeance is the reciprocal of

  • (A) flux density
  • (B) reluctance
  • (C) ampere-turns
  • (D) resistance

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