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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are
1, 4,5
2, 3, 5
2, 4, 5
1 , 3, 5
1, 4,5
2, 3, 5
2, 4, 5
1 , 3, 5
Answer
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Related Question
Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of
6 / 7.
2 / 3.
4 / 5.
5 / 6.
6 / 7.
2 / 3.
4 / 5.
5 / 6.
Answer
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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.
230 volt.
220 volt.
240 volt.
440 volt.
230 volt.
220 volt.
240 volt.
440 volt.
Answer
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Electrical Machines
Rotating magnetic field is produced in an induction motor because of
stator winding.
either stator winding or rotor winding.
rotor winding.
None of these
stator winding.
either stator winding or rotor winding.
rotor winding.
None of these
Answer
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Electrical Machines
With the increase in speed of a DC motor
both back emf as well as line current increase.
back emf increases but line current falls.
back emf falls and line current increases.
both back emf as well as line current fall.
both back emf as well as line current increase.
back emf increases but line current falls.
back emf falls and line current increases.
both back emf as well as line current fall.
Answer
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Electrical Machines
An induction motor is, in general analogous to
auto transformer.
None of these
two winding transformer with secondary open circuited.
two winding transformer with secondary short circuited.
auto transformer.
None of these
two winding transformer with secondary open circuited.
two winding transformer with secondary short circuited.
Answer
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