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Electrical Machines

Electrical Machines
Stepper motor is used in

 food processing
 computer printers
All of these
 traction

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 850 rpm
 1000 rpm
 950 rpm

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Electrical Machines
Satisfactory commutation of DC machine requires

 smooth, concentric commutator properly undercut.
 brushes should smoothly run in the holders.
All of these
 brushes should be of proper grade and size.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2Kf2Bm.
 Kef2KfBm2.
 KefKf2Bm2.
  Kef2Kf2Bm2.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
 0.512.
  0.573.
 0.443.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may not start.
 the motor may run away.
 the starting torque becomes low.
 the starting current will be enormously high.

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