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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 any of the above
 hyperbola
 linearised

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Electrical Machines
Which type motors are preferred for lathes?

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

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant supply voltage V, starting torque Tst decreases
 either of these
None of these
 constant V, Tst increases

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 460 A.
 570 A.
 340 A.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ V
 T ∝ 1/V²
 T∝ V²

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.
  protect the whole machine.

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