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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 0.1 Ω
 100 Ω
 50 Ω

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.66 Ω.
 0.78 Ω.
  0.24 Ω.
 0.45 Ω.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 reduced starting current.
 more starting time.
 smoother acceleration.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - delta
 Star - star
 Delta - delta

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in field coil.
  increase the speed of shaft rotation.
 increase the number of turns in armature coil.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 lagging
 leading
 zero

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