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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 increases.
 remains constant.
 decreases

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 depend on other factors.
 remain unchanged.
 increase by 5 %.
 reduce by 5 %.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

 about 100 V.
  very small, say about 2 or 3 V.
  250 V.
  zero.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
  222 V.
 230 V.
 225 V.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will come to stop.
 the armature current will reduce.
 the motor will attain dangerously high speed.
 the speed of motor will be reduced.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 1/Ia
 Ia2
 Ia

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