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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 90°
 70° to 85°
 0°

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 reduced starting torque.
  a large starting torque.
 low noise.
 higher efficiency.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, unshaded
 unshaded, shaded
 unshaded, unshaded
 shaded, shaded

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 and 2
 1 alone
 1 and 3
 2 and 3

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 1/2*ωm
 ωe = ωm
 ωe = 4*ωm
 ωe = 2*ωm

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f
 f2
 V2
 V

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