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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Field flux.
 Applied voltage.
 Armature current Ia.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 +3.33%
 -3%
 -3.33%

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load speed.
 Full load torque.
 None of these.
  Full load current.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in armature coil.
 increase the number of turns in field coil.
  increase the speed of shaft rotation.

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Electrical Machines
Slip exists in

  in both machines.
  synchronous motor.
  none of above.
  induction motor.

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Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
 any unbalanced magnetic pull on the armature core.
All of these
 bending moment due to weight of the armature.

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