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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 speed.
 current.
 power.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 1-S
 S
 2-S

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Electrical Machines
Stepper motor is used in

All of these
 computer printers
 food processing
 traction

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 cummulative compound motor.
 AC synchronous motor.
  series motor.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  220 V.
  zero.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 6 V
 240 V
 234 V
 474 V

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