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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 30 volts.
 10 volts.
 20 volts.
 40 volts.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

 20 N.
  15 N.
  None of these.
  Can't be determined.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 29 Amp.
  43 Amp.
  33.33 Amp.
 44.47 Amp.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 remains constant.
 increase proportional.
 reduce slightly.
 increased slightly.

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Electrical Machines
The ventilating ducts in most of DC machine are

 none of these.
 longitudinal.
 radial.
 radial as well as longitudinal.

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