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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.2
 0.04
 0.4

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

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

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 2
 0
 1

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  None of above.
  Rheostatic control.
  Ward Leonard control.
  Any of above method.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 motor armature terminal.
 generator armature terminal.
 generator field terminal.

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

 supply voltage V
 V²
 1/V
 1/V²

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