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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T ∝ 1/V
 T ∝ 1/V²
 T∝ V²

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 100 ohm
 10 ohm
 0.2 ohm
 2 ohm.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Ball bearings.
  Cast iron bearings.
None of these
  Bush bearings.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
  35 ppm.
 20 ppm.
 25 ppm.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 1.5Hz
 51.5Hz
 2.5Hz
 48.5Hz

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

 about 100 V.
  250 V.
  zero.
  very small, say about 2 or 3 V.

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