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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 decrease
 increase
 either increase or decrease

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Electrical Machines
Which type motors are preferred for lathes?

 Synchronous motor.
 Either A or B.
 DC shunt motors.
 Squirrel Cage induction motor.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 constant independent of speed.
 proportional to square of rotor speed.
  proportional to rotor speed.
 zero.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 Friction and windage losses
 All of the them
 Hysteresis losses

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 123.3 KVA
 83.33 KVA
 50 KVA

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 100V
 10V
 20V

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