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Electrical Machines

Electrical Machines
Stepper motor is used in

 traction
 computer printers
All of these
 food processing

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

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

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 √(Pi/Pc)
 Pc/Pi
 (Pi/Pc)2
 Pi/Pc

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Both B and C.
 Permanent magnets.
  Electromagnets.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv2.
 Blv.
 Bl2v2.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Series shunt.
 Cummulative compound.
  Differentical compound.
 have an equal number of electrons and protons.

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