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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 0 Hz
 25 Hz
 100 Hz

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Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Copper loss
 Hysteresis loss
 Eddy current loss

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I/2 and P/2
 V/2, I/2 and P/4
 V/2, I and P/2
 V, I and P

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Electrical Machines
The working principle of transformer depends on

 Amperes law.
 Newtons law.
 Coulombs law.
 Faradays law of electromagnetic induction.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

  salient.
 non uniform cylindrical.
 none of these.
 cylindrical.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 4.76%.
 2.56 %.
 2.57 %.
 3.76%.

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