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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 full load
 any of the above
 no load

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 240 volt.
  220 volt.
 440 volt.
 230 volt.

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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%.
 2.56 %.
 2.57 %.

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Electrical Machines
For larger units high torque it is preferred to use

 Partial motor.
 DC shunt motor.
 Slip induction motor.
 Universal motor.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and indirect axis
 quadrature axis and direct axis
 direct axis and interpolar axis
 quadrature axis and interpolar axis

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 66.3%
 57.7%
 50%

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