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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC shunt motors.
None of these
 DC series motors.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 component of armature mmf along field axis
 non-sinusoidal nature of armature mmf
 uneven air-gap length

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 440 A.
 40 A.
 400 A.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  crawling.
  skewing.
  cogging.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 75 rpm
 375 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  induction motor torque.
  synchronous motor torque.
  induction generator torque.

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MORE MCQ ON Electrical Machines

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