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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos (α/2)
 Cos α²
 sin (α/2)

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

 3.5 mWb.
  1.2 mWb.
 1.4 mWb.
 2.7 mWb.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature voltage control.
 Shunt field resistance control.
 Any of above.
 Armature resistance control.

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Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
None of these
 Effect of field flux on the armature flux.
 Effect of armature flux on the load.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

  hum.
 magnetostriction.
 zoom.
 boo.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 550 VA
 100 VA
 110 VA
 500 VA

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