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MCQs

Total Questions : 89 | Page 1 of 9 pages
Question 1. The voltage regulation of an alternator depends on
  1.    Both load current and pf
  2.    Power factor only
  3.    None of the listed here
  4.    Load current only
 Discuss Question
Answer: Option A. -> Both load current and pf
Question 2. Armature winding of an alternator are generally
  1.    Partly open and partly closed windings
  2.    Closed winding
  3.    Open winding
  4.    None of the listed here
 Discuss Question
Answer: Option C. -> Open winding
Question 3. Iron and friction losses of an alternator can be measured by a
  1.    Transformer
  2.    None of the listed here
  3.    Rectifier
  4.    Dc motor
 Discuss Question
Answer: Option D. -> Dc motor
Question 4. Copper losses of an alternator can be measured by
  1.    Rectifier
  2.    Dc motor
  3.    None of the listed here
  4.    Transformer
 Discuss Question
Answer: Option B. -> Dc motor
Question 5. Majority of the alternators are
  1.    Three phase
  2.    Single phase
  3.    None of the listed here
  4.    Two phase
 Discuss Question
Answer: Option A. -> Three phase
Question 6. The losses in an alternator are the same as in
  1.    A transformer
  2.    None of the listed here
  3.    A rectifier
  4.    A dc machine
 Discuss Question
Answer: Option D. -> A dc machine
Question 7. A two pole alternator is running at 1500 rpm. Its angular velocity is ______
  1.    118 rad/s
  2.    212 rad/s
  3.    192 rad/s
  4.    157 rad/s
 Discuss Question
Answer: Option D. -> 157 rad/s
Question 8. If the number of poles of an alternator is increased, the generated emf
  1.    Remains the same
  2.    Increases
  3.    None of the listed here
  4.    Decreases
 Discuss Question
Answer: Option B. -> Increases
Question 9. An alternator supplying power to a load with a leading power factor always has ______ voltage regulation.
  1.    Zero
  2.    Unity
  3.    Positive
  4.    Negative
 Discuss Question
Answer: Option D. -> Negative
Question 10. For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles.
  1.    4
  2.    12
  3.    2
  4.    8
 Discuss Question
Answer: Option C. -> 2

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