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Electrical Machines

Electrical Machines
Stepper motor is used in

 food processing
 traction
 computer printers
All of these

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be less than 10%
 be more than 10%
 remain unchanged
 be 12.5%

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  repulsion motor.
  transformer.
  asynchronous motor.
  shunt motor.

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Electrical Machines
Tappings of a transformer are provided

 at the neutral side end of hv side
 at the middle of hv side
 at the phase end of hv side
 at the phase end of lv side

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
  2 - s.
 1 - s.
 2 + s.

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Electrical Machines
Transformer cooling and insulating oil must be of

  low viscosity.
 low resistivity.
 high viscosity.
 low BDV.

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