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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
 25 Hz
 0 Hz
 100 Hz

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 1, 3, 5
 1, 2, 3, 4
 2, 3, 4

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 either of these
 not dependent on the slip
 inversely proportional to slip

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Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 square wave.
 sine wave.
 triangular wave.

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Series motor.
 Cumulatively compound motor.
 Shunt motor.

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Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 Induction motor.
 DC shunt.
 DC compound.

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