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MCQs

Total Questions : 526 | Page 1 of 53 pages
Question 1.  The efficiency of a d.c. shunt generator is maximum when the
  1.    magnetic losses are equal to the mechanical losses
  2.    field copper losses are equal to the constant losses
  3.    stray losses are equal to the copper losses
  4.    armature copper losses are equal to constant losses.
 Discuss Question
Answer: Option D. -> armature copper losses are equal to constant losses.
Question 2.  A DC generator can be termed as a
  1.    rotating amplifier
  2.    prime mover
  3.    power pump
  4.    none of the above
 Discuss Question
Answer: Option A. -> rotating amplifier
Question 3.  A DC generator generates
  1.    DC voltage
  2.    AC voltage
  3.    DC and ac voltage
  4.    pulsating DC
 Discuss Question
Answer: Option B. -> AC voltage
Question 4.  The essential condition for stable parallel operation of two dc generators having similar characteristics is that they should have
  1.    same kilowatt output ratings
  2.    drooping voltage characteristics
  3.    same percentage regulation
  4.    same no-load and full-load speeds
 Discuss Question
Answer: Option B. -> drooping voltage characteristics
Question 5.  In a dc generator, the brushes on the commutator are shifted from geometrical neutral positions to
  1.    obtain highest generator voltage
  2.    avoid sparking.
  3.    obtain highest generator efficiency
  4.    all the above
 Discuss Question
Answer: Option B. -> avoid sparking.
Question 6.  Which condition out of the five given below is not required for the build-up of a shunt generator?
  1.    there must be sufficient residual magnetism in the poles
  2.    for the given direction of rotation, shunt field coils should be corectly connected to the armature
  3.    if excited on open circuit, the shunt field resistance should be more than the critical resistance
  4.    armature speed should be more than the critical speed
 Discuss Question
Answer: Option D. -> armature speed should be more than the critical speed
Question 7.  A simplex lap-wound 10-pole dc generator has 800 armature conductors. If each pole face covers 75% of pitch, compensating conductors required per pole face are
  1.    80
  2.    6
  3.    (b) 60
  4.    8
 Discuss Question
Answer: Option C. -> (b) 60
Question 8.   If field resistance of a dc shunt generator is increased beyond its critical value, the generator
  1.    output voltage will exceed its nameplate rating
  2.    will not build up
  3.    may burn out if loaded to its nameplate rating
  4.    power output may exceed its nameplate rating
 Discuss Question
Answer: Option B. -> will not build up
Question 9.  The main factor which leads to unstable parallel operation of flat and overcom pound generators is
  1.    unequal number of turns in their series field windings
  2.    unequal series field resistances
  3.    their rising voltage characteristics
  4.    unequal speed regulation of their prime movers -
 Discuss Question
Answer: Option C. -> their rising voltage characteristics
Question 10. . If residual magnetism of a shunt generator is destroyed accidentally, it may be restored by connecting its shund field
  1.    to earth
  2.    to an alternator
  3.    in reverse
  4.    to a battery
 Discuss Question
Answer: Option D. -> to a battery

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