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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.

 0.443.
 0.512.
 0.649.
  0.573.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - delta
 Delta - star
 Star - delta

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 3.76%.
 4.76%.
 2.57 %.
 2.56 %.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero , - 50 rpm.
 1000 rpm, 950 rpm.
 1000 rpm, - 50 rpm.
 zero, 950 rpm.

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
 Brushless DC motor.
  Series motor.
 Shunt motor.

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

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

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