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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 440 A.
 40 A.
 44 A.

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Electrical Machines
Secondary winding of an auto transformer is also called

 damping winding.
  common winding.
 tertiary winding.
 compensating winding.

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Electrical Machines
Conservator tank is used

 for better cooling of transformer.
 to act as an oil storage.
None of these
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 4 times.
 half.
 one fourth.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with armature
 parallel with main poles
 parallel with armature
 series with main poles

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the motor will come to stop.
 the motor will attain dangerously high speed.
 the armature current will reduce.

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