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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  carbon.
  stainless steel.
  phosphor bronze.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
  Can't be determined.
 20 N.
  None of these.

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 provide ease of fabrication.
 decrease the amount of copper to be used.
 reduce the magnetic hum and locking tendency of rotor.
 increase the strength of rotor bars.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 peaky in nature
 flat tapped or trapezoidal
 sine wave

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Electrical Machines
Which of the following motors has negative speed regulation?

 Shunt motors.
 Differential compound motors.
 Both B and C.
 Series motors.

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