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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EbIa.
  none of these.
  EIa.

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

 T ∝ 1/V
 T∝ V²
 T ∝ 1/V²
 T ∝ V

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 900 rpm
 950 rpm
 850 rpm

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thinner.
  rotor can not have any laminations.
  sipper.
  thicker.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC compound motor.
 DC shunt motor with armature resistance.
 DC series motor.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will come to stop.
 the motor will attain dangerously high speed.
 the armature current will reduce.
 the speed of motor will be reduced.

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