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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T ∝ 1/V²
 T ∝ 1/V
 T∝ V²

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Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.
All of these

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

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

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

  1, 2 and 3.
 2 and 4.
 2, 3 and 4.
 1, 3 and 4.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 increase the permeability.
 reduce eddy current loss only.
 reduce hysteresis loss only.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 400 V.
 350 V.
 480 V.

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