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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 250 rpm
 2000 rpm
 500 rpm

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  high staring torque and high power factor.
  high staring torque only.
  none.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
  s.
 2 + s.
 1 - s.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Cummulative compound motor.
 Shunt motor.
 Differential compound motor.

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Electrical Machines
Which type of motors are used for lathes?

 DC shunt motors.
 Either A or B.
 Synchronous motor.
 Cage induction motor.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia2
 I/Ia2
 1/Ia
 Ia

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