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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 dependent upon the load.
 0o.
 180o.
 90o.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 90°
 25° to 30°
 70° to 85°

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Electrical Machines
A motor operates in stable region at which of the following slip?

 high slip region
 low slip region
 both 1 and 2
 unity slip

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 none of above.
 back emf is equal to applied voltage.
 back emf is equal to twice of applied voltage.
 back emf is equal to half of applied voltage.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 500 rpm
 250 rpm
 1000 rpm

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 non-ferrous material.
 conducting material.
 insulating material.

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