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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 DC
 AC and DC
 AC

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase in proportion to reduction in load.
  The speed will remains almost constant.
 DC Shunt Motor
 The speed will increase abruptly.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 both 1 and 2
 core loss only
 Copper loss
 windage and friction loss

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running torque.
  ratio of starting to running current.
  ratio of input to output voltage.
  efficiency.

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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?

 10V
 100V
 200V
 20V

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 50 Hz
 60 Hz
 25 Hz

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