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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 cooling.
  insulating.
 lubrication.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 Ω
 2.2 Ω
 5.7 Ω
 6 Ω

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  over compounded.
  shunt.
  under-compounded.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 None of above.
 Proportional to the armature current.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.

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Electrical Machines
Which of the following pairs is/are correct?

 semi closed slot-----leakage flux is moderate
All of these
 open slot----- leakage flux is less
 closed slot----- leakage flux is high

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Electrical Machines
The function of field regulator in a DC compound motor is to

 limit the armature current.
 none of above.
 vary the armature resistance.
 control field current.

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MORE MCQ ON Electrical Machines

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