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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
  both cooling and insulation.
  insulating.
 cooling.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Mica.
  Glass.
  Vacuum.
  Oil impregnated paper.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 decreases
 remains unaffected
 increases
None of these

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 2 .1 Ω
 3.1 Ω
 1.8 9 Ω

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Electrical Machines
Which machine is used for battery charging?

 DC series generator.
 DC shunt generator.
 Compounded DC generator.
 None of these.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.
None of these
 Both 1 and 2.

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