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Electrical Machines

Electrical Machines
Universal motors are used in

All of these
 food processing
 cranes
 traction

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start capacitor run IM.
  Synchronous motor.
  Capacitor start IM.
  Split phase IM.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.6 Nm
 Zero
 16.55 Nm
 15.28 Nm

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Synchronous motors.
  Cage induction motor.
  Shaded pole IM.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Increase.
  Decrease.
 None of these.
 Remains same.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 decrease.
 increase.
 None of above.

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