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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 1.5KW
 2KW
 3KW

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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
 6 Ω
 1.9 Ω
 2.2 Ω

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 hysteresis loss.
 eddy electric current loss.
 copper loss.
 vibrations.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Open slot type machines.
 Semi closed slot type machine.
 Any of the above.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of iron.
 volume of copper.
 iron loss.
 reluctance of core.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

  induction generator.
 synchronous motor.
 synchronous generator.
 induction motor.

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