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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.2
 0.04
 0.4

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Electrical Machines
Rotating part of DC motor is known as

 Armature.
 Pole.
 Starter.
 Carbone brush.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  3000 rpm.
  3600 rpm.
  500 rpm.

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure capacitive load
 pure inductive load
None of these
 pure resistive load

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 cumulatively compounded generator
 shunt generator
 series generator
 differentially compounded generator

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 interpole region.
 throughout the air gap.
None of these
  region under main pole.

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