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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
  0.573.
 0.443.
 0.649.

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Electrical Machines
Which type of motors are used for lathes?

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

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1600 Volt.
 2000 Volt.
  0 Volt.
 1500 Volt.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs load current
 Eg vs load current
 Vt vs Ia
 Eg vs Ia

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Electrical Machines
Drop in speed from no load to full load is very high in

 Series motor with interpoles.
 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Shunt motor with interpoles.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 2000W
 1820W
 1920W

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