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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be
zero watt
less than 30 W
more than 30 W
30 W
zero watt
less than 30 W
more than 30 W
30 W
Answer
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Related Question
Electrical Machines
Hysteresis loss will depends on
f³
f1.6
f²
f
f³
f1.6
f²
f
Answer
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Electrical Machines
The use of double squirrel cage winding on the rotor provides
reduced starting torque.
low noise.
higher efficiency.
a large starting torque.
reduced starting torque.
low noise.
higher efficiency.
a large starting torque.
Answer
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Electrical Machines
In an auto-transformer, power is transferred through
induction process only.
both A and B.
conduction process only.
None of these
induction process only.
both A and B.
conduction process only.
None of these
Answer
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Electrical Machines
The use of higher flux density in the transformer design
None of these
has no relation with the weight of transformer
reduces the weigh per KVA
increases the weigh per KVA
None of these
has no relation with the weight of transformer
reduces the weigh per KVA
increases the weigh per KVA
Answer
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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?
0.04, 1.96
0.02, 1.98
0.04, 0.96
0.02, 0.98
0.04, 1.96
0.02, 1.98
0.04, 0.96
0.02, 0.98
Answer
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