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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 200 - 250 W.
 10 - 20 W.
  50 - 150 W.

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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 power flow of a dc motor, with respect to a DC generator is

  increased.
  none of these.
  reversed.
  modified.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  deferentially compounded.
 shunt connected.
  series connected.
  cumulatively compounded.

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

  Core loss component.
 Rotor speed.
 Shaft torque.
 Synchronous speed.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1037.5 r.p.m.
 none of above.
 1130 r.p.m.

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