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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 0 Hz
 5 Hz
 50 Hz

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  600 rpm.
  500 rpm.
  3000 rpm.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 100 Hz.
 50 Hz.
 Zero Hz.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of crawling.
  reduce the magnetizing current.
  reduce the chance of cogging.
  increase the starting torque.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φ/f
 E ∝ 1/(φf)
 E ∝ f/φ
 E ∝ φf

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide protection against Low-Voltage.
 provide overload protection.
 limit the starting current to a safer value.
 all of above.

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MORE MCQ ON Electrical Machines

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