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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 supply voltage V
 1/V
 V²

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 60 V.
 20 V.
 40 V.
 0 V.

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Electrical Machines
Series booster is a

 separately excited DC generator.
 shunt wound DC generator.
  series wound DC generator.
 permanent magnet DC generator.

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Electrical Machines
The output voltage of a DC generator is

  E = V + IaRa.
 E = V – IaRa.
 E = V + Ia.
 E = V + Ra.

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Electrical Machines
Which of the following motors is/are widely used?

 squirrel cage induction motor
 either of these
 slip ring induction motor
None of these

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 high efficiency.
 low starting torque.
  quick acceleration.
 reduced size.

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