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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.05.
  0.5.
  1.0.
  0.1.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

All of these
 Capacitor run motor
 Capacitor split phase motor
 Resistance split phase motor

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Synchronous motor.
 Induction motor.
 AC single phase motor.

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Electrical Machines
Hunting phenomenon is observed in which motor?

 Induction motor.
 Both A and C.
 DC motor.
  Synchronous motor.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 4 time the initial value
 1/2 of the initial value
 twice the initial value

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in series with the series field
 in parallel with the shunt field
 in parallel with the series field

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