D. C. Generators MCQs with answers Page - 5

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A

Admin • 802.91K Points
Coach

Q. A separately excited generator as compared to a self-excited generator

  • (A) is amenable to better voltage con-trol
  • (B) is more stable
  • (C) has exciting current independent of load current
  • (D) has all above features

A

Admin • 802.91K Points
Coach

Q. In case of D.C. machines, mechanical losses are primary function of

  • (A) current
  • (B) voltage
  • (C) speed
  • (D) none of above

A

Admin • 802.91K Points
Coach

Q. Iron losses in a D.C. machine are independent of variations in

  • (A) speed
  • (B) load
  • (C) voltage
  • (D) speed and voltage

A

Admin • 802.91K Points
Coach

Q. In D.C. generators, current to the external circuit from armature is given through

  • (A) commutator
  • (B) solid connection
  • (C) slip rings
  • (D) none of above

A

Admin • 802.91K Points
Coach

Q. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by

  • (A) Blv
  • (B) Blv2
  • (C) Bl2v
  • (D) Bl2v2

A

Admin • 802.91K Points
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Q. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be

  • (A) 4
  • (B) 8
  • (C) 16
  • (D) 32

A

Admin • 802.91K Points
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Q. The material for commutator brushes is generally

  • (A) mica
  • (B) copper
  • (C) cast iron
  • (D) carbon

A

Admin • 802.91K Points
Coach

Q. The insulating material used between the commutator segments is normally

  • (A) graphite
  • (B) paper
  • (C) mica
  • (D) insulating varnish

A

Admin • 802.91K Points
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Q. In D.C. generators, the brushes on commutator remain in contact with conductors which

  • (A) lie under south pole
  • (B) lie under north pole
  • (C) lie under interpolar region
  • (D) are farthest from the poles

A

Admin • 802.91K Points
Coach

Q. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be

  • (A) demagnetisation only
  • (B) cross magnetisation as well as magnetisation
  • (C) crossmagnetisation as well as demagnetising
  • (D) cross magnetisation only

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