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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then
wave-wound machine will have more rated current and more voltage
lap-wound machine will have more rated voltage and less current
wave-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
wave-wound machine will have more rated current and more voltage
lap-wound machine will have more rated voltage and less current
wave-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
Answer
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Related Question
Electrical Machines
The stator frame in an induction motor is used to
hold armature stamping in position.
ventilate the armature.
provide return path for the flux.
protect the whole machine.
hold armature stamping in position.
ventilate the armature.
provide return path for the flux.
protect the whole machine.
Answer
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Electrical Machines
Interpoles in a DC motor must be
Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Answer
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Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are
2, 3 , 5
1, 4
1, 3, 5
2, 4 ,5
2, 3 , 5
1, 4
1, 3, 5
2, 4 ,5
Answer
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Electrical Machines
Tap changer is generally provided in
earthing transformer.
voltage transformer.
current transformer.
power transformer.
earthing transformer.
voltage transformer.
current transformer.
power transformer.
Answer
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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?
None of these
stationary
rotates opposite direction
rotates same direction
None of these
stationary
rotates opposite direction
rotates same direction
Answer
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