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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)2 × full Load.
 (Pi / Pc)1.6 × full Load.
  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc) × full Load.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 5 %.
  30 %.
 1.5 %.
  2.67 %.

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Electrical Machines
Stepper motor is used in

 traction
All of these
 computer printers
 food processing

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.
None of these
  the supply voltage and the back emf.

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 cotton insulation.
 rubber insulation.
  paper insulation.
 wooden insulation.

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