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Electrical Machines

Electrical Machines
The application that need frequent starting and stopping is

  blowers.
  jaw crushers.
  paper mills.
  lifts and hoists.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
 238.2 V.
 240 V.
  256.4 V.

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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).
  unequal to number of rotor slots and skewed in shape.
  equal to number of rotor slots.
  an integral multiple of number of rotor slots.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1500.
 1450.
 1440.
  1435.

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.4.
 1.8.
  1.2.
 1.5.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 48.5Hz
 1.5Hz
 2.5Hz
 51.5Hz

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