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Electrical Machines

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

 V²
 f
 f²
 V

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 120 V
 140 V
 175 V
 240 V

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 directly.
 has no relation.
 inversely.

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Electrical Machines
Which type of motors uses slip rings?

 Both Synchronous and Induction motor
 DC Shunt Motor
 Induction motors
 Synchronous motors

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
 450 rpm.
  240 rpm.
  470 rpm.

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Electrical Machines
Torque developed in the rotor is

 inversely proportional to slip
 directly proportional to slip
 not dependent on the slip
 either of these

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MORE MCQ ON Electrical Machines

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