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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 100 ohm.
 50 ohm.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 remains constant.
 decreases.
 decreases
 increases.

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 240 V.
 150 V.
 210 V
 230 V.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  three phase winding.
  single phase winding.
  heavy copper or aluminium bars placed in rotor slots.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

  12.
 4.
 3.
 7.

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Electrical Machines
A small air gap in poly phase induction motor helps to

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

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