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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?
60W
40W
100W
80W
60W
40W
100W
80W
Answer
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Related Question
Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be
15.28 Nm
15.92 Nm
15.6 Nm
16.55 Nm
15.28 Nm
15.92 Nm
15.6 Nm
16.55 Nm
Answer
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Electrical Machines
The output power of any electrical motor is taken from the
Motor frame.
Armature.
Coupling mounted on the shaft.
Field.
Motor frame.
Armature.
Coupling mounted on the shaft.
Field.
Answer
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Electrical Machines
The power factor of squirrel cage induction motor is
low at rated load only
low at heavy loads only
low at light loads only
both A and B
low at rated load only
low at heavy loads only
low at light loads only
both A and B
Answer
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Electrical Machines
Which of the following pairs is/are correct?
closed slot----- leakage flux is high
open slot----- leakage flux is less
All of these
semi closed slot-----leakage flux is moderate
closed slot----- leakage flux is high
open slot----- leakage flux is less
All of these
semi closed slot-----leakage flux is moderate
Answer
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Electrical Machines
Swinburne test is conducted under which of the following condition?
no load
any of the above
full load
half load
no load
any of the above
full load
half load
Answer
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