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MCQs

Total Questions : 377 | Page 9 of 38 pages
Question 81. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
  1.    150 V
  2.    175 V
  3.    240 V
  4.    290 V
 Discuss Question
Answer: Option C. -> 240 V
Question 82. For both lap and wave windings, there are as many commutator bars as the number of
  1.    Slots
  2.    Armature conductors
  3.    Winding elements
  4.    Poles
 Discuss Question
Answer: Option C. -> Winding elements
Question 83. Armature reaction of an unsaturated D.C. machine is
  1.    Cross-magnetizing
  2.    Demagnetizing
  3.    Magnetizing
  4.    None of above
 Discuss Question
Answer: Option A. -> Cross-magnetizing
Question 84. 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
  1.    2 : 3
  2.    3 : 1
  3.    3 : 2
  4.    1 : 3
 Discuss Question
Answer: Option B. -> 3 : 1
Question 85. A shunt generator can self-excite
  1.    Only if the resistance of the field circuit is less than critical value
  2.    Only if the resistance of the field circuit is greater than critical value
  3.    Irrespective of the value of the resistance in the field circuit
  4.    None of the above
 Discuss Question
Answer: Option A. -> Only if the resistance of the field circuit is less than critical value
Question 86. A series generator can self-excite
  1.    Only if the load current is zero
  2.    Only if the load current is not zero
  3.    Irrespective of the value of load current
  4.    None of the above
 Discuss Question
Answer: Option B. -> Only if the load current is not zero
Question 87. The armature of D.C. generator is laminated to
  1.    reduce the bulk
  2.    provide the bulk
  3.    insulate the core
  4.    reduce eddy current loss
 Discuss Question
Answer: Option D. -> reduce eddy current loss
Question 88. The material for commutator brushes is generally
  1.    Mica
  2.    Copper
  3.    Cast iron
  4.    Carbon
 Discuss Question
Answer: Option D. -> Carbon
Question 89. Armature coil is short circuited by brushes when it lies
  1.    Along neutral axis
  2.    Along field axis
  3.    In any of the above positions
  4.    In none of the above positions
 Discuss Question
Answer: Option A. -> Along neutral axis
Question 90. Satisfactory commutation of D.C. machines requires
  1.    Brushes should be of proper grade and size
  2.    Brushes should smoothly run in the holders
  3.    Smooth, concentric commutator properly undercut
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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