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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 AC
 AC and DC
 DC

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 DC Shunt Motor
 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 smoother acceleration.
 more starting time.
 reduced starting current.

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Electrical Machines
Which type motors are preferred for lathes?

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

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 none of these.
 core.
 armature.

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