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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 74
 72
 37

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
None of these
 either of these

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pc/Pi
 √(Pi/Pc)
 (Pi/Pc)2
 Pi/Pc

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will increase
 its efficiency will improve
 its speed will reduce
 its power factor will reduce

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
 is always unity.
 is always lagging.
  depends on the power factor of the load.

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