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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.4
 0.02
 0.2

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  √Ia.
  1/Ia.
  Ia.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

  Back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.
 None of above.
 Back emf is equal.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.16 pu.
 0.01 pu.
  0.08 pu.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at normal speed.
 run at lower speed.
 not run.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 750 rpm
 1500 rpm
 3000 rpm

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