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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
 8 pole.
  2 pole.
 4 pole.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara
 Vt= Ea– Iara
 Vt = Ea + Ia(ra + rs)

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 30 V.
 60 V.
 40 V.
 90 V.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Over-loading for long period.
  Small and constant load.
  Over-excitation.

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Electrical Machines
A DC generator can be considered as

 rectifier.
 prime mover.
 power pump.
 rotating amplifier.

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Electrical Machines
Stepper motor is used in

All of these
 traction
 food processing
 computer printers

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