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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at lower speed.
 run at normal speed.
 burn.
 not run.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Separately compound motor.
  Synchronous motor.
  DC series motor.
  Shunt motor.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Fibre.
 Mild steel.
 Silicon steel.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 iron made tank of transformer.
 steel core in transformer.
 winding of transformer.

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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?

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

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 DC series generator.
 DC shunt generator.
 None of these.

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