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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
 Silicon steel.
 Cast iron.
  Fibre.

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Series.
  Shunt.
  Compound.
  None of them.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 100W
 500W
 1000W

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 As a separate unit.
  In series with the armature winding.
 In parallel with the armature winding.
 In parallel with the field winding.

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase abruptly.
 DC Shunt Motor
  The speed will remains almost constant.
 The speed will increase in proportion to reduction in load.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 winding of transformer.
 iron made tank of transformer.
 transformer insulating oil.

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