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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 decrease
 either increase or decrease
None of these
 increase

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a poor torque.
 Has a almost constant speed.
 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 f²
 V
 V²

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1440.
  1435.
 1500.
 1450.

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 suppress the hunting.
 increase the load current.
 decrease the load current.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 20%
 increased by 10%
 reduced by 10%
 increased by 20%

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