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Electrical Machines

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

 f
 V
 f²
 V²

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 20V
 200V
 100V

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

 half load
 full load
 no load
 any of the above

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 crawling.
 plugging.
 cogging.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

None of these
 Zero
 Slip speed
 Synchronous speed

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 270 rpm.
 541.67V, 200 rpm.
 541.67V, 250 rpm.
 2166.67V, 230 rpm.

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