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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
  zero.
 4 %.
 1.5 %.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Split phase IM.
  Capacitor start capacitor run IM.
  Capacitor start IM.

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Electrical Machines
Maximum power will be developed when back emf is

All of these
 double the supply voltage.
 equal to supply voltage.
 half of the supply voltage.

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
None of these
 either increase or decrease

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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

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

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