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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
  convection.
All of these
 radiation.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 None of these.
 Heavy sparking at the first stud of starting resistance steps.
 Heavy sparking at brushes.
 Both of above.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
 10 Hz.
  3 Hz.
  2 Hz.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 increasing field excitation.
 fixing the brush axis inline with the pole axis.
  compensating winding and commutating poles.
 shifting the brush axis from GNA to MNA.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 Zero Hz.
 25 Hz.
 100 Hz.
 50 Hz.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 increase.
None of these
 either of these.

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MORE MCQ ON Electrical Machines

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