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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 less than 50%.
 same.
 between 50% and 90%.

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Electrical Machines
Generator works on the principle of production

 static induced emf.
 both A and B.
 dynamically induced emf.
None of these

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 234.76 N-m.
 133.22 N-m

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 100%
 remain unaltered
 reduced to half
 increase by 200%

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Shunt motor.
 Differential compound motor.
 Cummulative compound motor.
 Series motor.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 decrease.
 become execessively high.
 increase.

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