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Electrical Machines

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  reversed.
  modified.
  none of these.
  increased.

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Electrical Machines
The basic function of a transformer is to change

 the level of the voltage
 the power factor
 the power level
 the frequency

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 slip speed.
 synchronous speed.
 any of the above.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 stray losses.
 dielectric losses.
 core losses.
 copper losses.

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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

 5.7 Ω
 1.9 Ω
 2.2 Ω
 6 Ω

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 plugging.
 locking.
 crawling.
 cogging.

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MORE MCQ ON Electrical Machines

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