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Electrical Machines

Electrical Machines
Diverters are used only in

 either of these
 series motors
None of these
 shunt motors

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

  66.91 V.
 56.91 V.
 86.91 V.
 76.91 V.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.4
 0.2
 0.02

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Electrical Machines
Which of the following motor used in hair dryers?

  Synchronous motors.
  Cage induction motor.
  Shaded pole IM.
  Split phase IM.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P*ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 230 V
 some what less than 230 V
 not possible

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