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Electrical Machines
A 3 - ÃŽÂ¦, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 ÃŽÂ© and 0.5 ÃŽÂ© respectively. The speed of maximum torque will be
540 rpm.
450 rpm.
470 rpm.
240 rpm.
540 rpm.
450 rpm.
470 rpm.
240 rpm.
Answer
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Related Question
Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series
66.91 V.
56.91 V.
86.91 V.
76.91 V.
66.91 V.
56.91 V.
86.91 V.
76.91 V.
Answer
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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at
unity power factor.
any of the above.
lagging power factor.
leading power factor.
unity power factor.
any of the above.
lagging power factor.
leading power factor.
Answer
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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is
440 A.
400 A.
40 A.
44 A.
440 A.
400 A.
40 A.
44 A.
Answer
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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be
2000 rpm
500 rpm
1000 rpm
250 rpm
2000 rpm
500 rpm
1000 rpm
250 rpm
Answer
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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is
192 V
384 V
768 V
96 V
192 V
384 V
768 V
96 V
Answer
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