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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/√3
 √3
 3
 1/3

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Electrical Machines
DC machine windings are

 full pitched
 either of these
None of these
 short pitched

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator armature terminal.
 motor field terminal.
 motor armature terminal.
 generator field terminal.

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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

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

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 throughout the air gap.
 interpole region.
None of these
  region under main pole.

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

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

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