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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 19%
 10%
 5%

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
  salient.
 none of these.
 non uniform cylindrical.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Any of the above.
 Semi closed slot type machine.
 Open slot type machines.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage
 remain nearly constant
 decrease

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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

 44 A.
 400 A.
 40 A.
 440 A.

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Electrical Machines
Which of the following is the largest conversion device?

 DC machine
 Induction machine
All of these
 Synchronous machine

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