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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 copper loss
 iron loss
 mechanical loss

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  breaking torque.
  cost of operation.
  power factor.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Blowers.
 Air compressors.
 Centrifugal pumps.
  Conveyers.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 same in both methods
 armature resistance control
None of these
 field weakening method

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 supply voltage and field current at constant excitation
All of these
 power factor and supply voltage during hunting
 power factor and dc excitation at constant load

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Electrical Machines
At stand still condition the value of slip is

 1
 0
 finite value
 infinite value

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MORE MCQ ON Electrical Machines

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