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MCQs

Total Questions : 377 | Page 2 of 38 pages
Question 11. The purpose of providing dummy coils in a generator is
  1.    To reduce eddy current losses
  2.    To enhance flux density
  3.    To amplify voltage
  4.    To provide mechanical balance for the rotor
 Discuss Question
Answer: Option D. -> To provide mechanical balance for the rotor
Question 12. Brushes of D.C. machines are made of
  1.    Carbon
  2.    Soft copper
  3.    Hard copper
  4.    All of above
 Discuss Question
Answer: Option A. -> Carbon
Question 13. Lap winding is composed of
  1.    Any even number of conductors
  2.    Any odd number of conductors
  3.    That even number which is exact multiple of poles + 2
  4.    That even number which is exact multiple of poles
 Discuss Question
Answer: Option A. -> Any even number of conductors
Question 14. Wave winding is composed of
  1.    Any even number of conductors
  2.    Any odd number of conductors
  3.    That even number which is exact multiple of poles + 2
  4.    That even number which is exact multiple of poles
 Discuss Question
Answer: Option C. -> That even number which is exact multiple of poles + 2
Question 15. The commutator segments are connected to the armature conductors by means of
  1.    Copper lugs
  2.    Resistance wires
  3.    Insulation pads
  4.    Brazing
 Discuss Question
Answer: Option A. -> Copper lugs
Question 16. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator?
  1.    Dummy coils
  2.    Commutator
  3.    Eye bolt
  4.    Equalizer rings
 Discuss Question
Answer: Option B. -> Commutator
Question 17. Open circuited armature coil of a D.C. machine is
  1.    Identified by the scarring of the commutator segment to which open circuited coil is connected
  2.    Indicated by a spark completely around the commutator
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 18. In lap winding, the number of brushes is always
  1.    Double the number of poles
  2.    Same as the number of poles
  3.    Half the number of poles
  4.    Two
 Discuss Question
Answer: Option B. -> Same as the number of poles
Question 19. The number of brushes in a commutator depends on
  1.    Speed of armature
  2.    Type of winding
  3.    Voltage
  4.    Amount of current to be collected
 Discuss Question
Answer: Option D. -> Amount of current to be collected
Question 20. Which of the following generating machine will offer constant voltage on all loads?
  1.    Self-excited generator
  2.    Separately excited generator
  3.    Level compounded generator
  4.    All of the above
 Discuss Question
Answer: Option C. -> Level compounded generator

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