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MCQs

Total Questions : 377 | Page 3 of 38 pages
Question 21. D.C. generator generally preferred for charging automobile batteries is
  1.    Series generator
  2.    Shunt generator
  3.    Long shunt compound generator
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Long shunt compound generator
Question 22. To avoid formation of grooves in the commutator of a D.C. machine
  1.    The brushes of opposite polarity should track each other
  2.    The brushes of same polarity should track each other
  3.    Brush position has no effect on the commutator grooving
  4.    All of the above
 Discuss Question
Answer: Option A. -> The brushes of opposite polarity should track each other
Question 23. The main factor which leads to unstable parallel operation of flat and over compounded generators is
  1.    their rising voltage characteristics
  2.    unequal number of turns in their series field windings
  3.    unequal speed regulation of their primemovers
  4.    unequal series field resistances
 Discuss Question
Answer: Option A. -> their rising voltage characteristics
Question 24. For a D.C. machines laboratory following type of D.C. supply will be suitable
  1.    Rotary converter
  2.    Mercury are rectifier
  3.    Induction motor D.C. generator set
  4.    Synchronous motor D.C. generator set
 Discuss Question
Answer: Option C. -> Induction motor D.C. generator set
Question 25. The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
  1.    Armature reaction
  2.    Armature resistance drop
  3.    Field weakening due to armature reaction and armature
  4.    Commutation
 Discuss Question
Answer: Option D. -> Commutation
Question 26. When two D.C. series generators are running in parallel, an equalizer bar is used
  1.    To increase the speed and hence generated e.m.f.
  2.    To increase the series flux
  3.    So that two similar machines will pass approximately equal currents to the load
  4.    To reduce the combined effect of armature reaction of both machines
 Discuss Question
Answer: Option C. -> So that two similar machines will pass approximately equal currents to the load
Question 27. When two D.C. generators are running in parallel an equalizer bar is used
  1.    To increase the series flux
  2.    To increase the generated e.m.f.
  3.    To reduce the combined effect of armature reaction of both the machines
  4.    So that the two identical machines will pass approximately equal currents to the load
 Discuss Question
Answer: Option D. -> So that the two identical machines will pass approximately equal currents to the load
Question 28. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by
  1.    Using conductor of annealed copper
  2.    Using commutator with large number of segments
  3.    Using carbon brushes of superior quality
  4.    Using equalizer rings
 Discuss Question
Answer: Option C. -> Using carbon brushes of superior quality
Question 29. The armature core of a D.C. generator is usually made of
  1.    Silicon steel
  2.    Copper
  3.    Nonferrous material
  4.    Cast-iron
 Discuss Question
Answer: Option A. -> Silicon steel
Question 30. Magnetic field in a D.C. generator is produced by
  1.    Electromagnets
  2.    Permanent magnets
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option A. -> Electromagnets

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