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MCQs

Total Questions : 377 | Page 5 of 38 pages
Question 41. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be
  1.    Zero
  2.    Small
  3.    The same as rated voltage
  4.    High
 Discuss Question
Answer: Option A. -> Zero
Question 42. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage
  1.    Will be less than 250 V
  2.    Will always be 250 V
  3.    May be greater or less than 250 V
  4.    None of the above
 Discuss Question
Answer: Option C. -> May be greater or less than 250 V
Question 43. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except
  1.    Interpoles
  2.    Dummy coils
  3.    Compensating winding
  4.    Shifting of axis of brushes
 Discuss Question
Answer: Option B. -> Dummy coils
Question 44. In a D.C. generator the critical resistance refers to the resistance of
  1.    Brushes
  2.    Field
  3.    Armature
  4.    Load
 Discuss Question
Answer: Option B. -> Field
Question 45. While applying Fleming's right-hand rule to and the direction of induced e.m.f., the thumb points towards
  1.    Direction of induced e.m.f.
  2.    Direction of flux
  3.    Direction of motion of the conductor if forefinger points in the direction of generated e.m.f.
  4.    Direction of motion of conductor, if forefinger points along the lines of flux
 Discuss Question
Answer: Option D. -> Direction of motion of conductor, if forefinger points along the lines of flux
Question 46. As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately
  1.    40 percent
  2.    25 percent
  3.    10 percent
  4.    5 percent
 Discuss Question
Answer: Option D. -> 5 percent
Question 47. An exciter for a turbo generator is a
  1.    Separately excited generator
  2.    Shunt generator
  3.    Series generator
  4.    Compound generator
 Discuss Question
Answer: Option B. -> Shunt generator
Question 48. Inter-pole flux should be sufficient to
  1.    Neutralize the commutating self induced e.m.f.
  2.    Neutralize the armature reaction flux
  3.    Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil
  4.    Perform none of the above functions
 Discuss Question
Answer: Option C. -> Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil
Question 49. In D.C. generators the polarity of the interpoles
  1.    Is the same as that of the main pole ahead
  2.    Is the same as that of the immediately preceding pole
  3.    Is opposite to that of the main pole ahead
  4.    Is neutral as these poles do not play part in generating e.m.f.
 Discuss Question
Answer: Option A. -> Is the same as that of the main pole ahead
Question 50. The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option B. -> 4

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