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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 40%
 19%
 5%

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 None of above.
 decrease.
 not change.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 speed.
 power.
 current.

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Electrical Machines
An induction motor is, in general analogous to

 auto transformer.
 two winding transformer with secondary open circuited.
 two winding transformer with secondary short circuited.
None of these

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Electrical Machines
What is the highest possible speed of turbo alternators?

 4000 rpm
 1500 rpm
 3000 rpm
 1000 rpm

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 1 Hz
 0 Hz
 5 Hz

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