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Electrical Machines

Electrical Machines
Compensating winding is placed in the

All of these
 armature core
 pole shoe
 main field

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Electrical Machines
Hysteresis loss will depends on

 f³
 f
 f1.6
 f²

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Electrical Machines
stepped cores are used in transformers in order to reduce

 iron loss.
 reluctance of core.
 volume of iron.
 volume of copper.

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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 + Ia(ra + rs)
 Vt= Ea + Iara

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 150 V.
 280 V.
 220 V.

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

  0.24 Ω.
 0.45 Ω.
 0.78 Ω.
 0.66 Ω.

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