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Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are
1, 2, 3, 4 and 5
2, 3, 4
2, 3, 4, 5
1, 3, 4, 5
1, 2, 3, 4 and 5
2, 3, 4
2, 3, 4, 5
1, 3, 4, 5
Answer
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Related Question
Electrical Machines
In a DC machine, the angle between the stator and rotor fields is
0o.
90o.
180o.
dependent upon the load.
0o.
90o.
180o.
dependent upon the load.
Answer
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Electrical Machines
In an ideal DC generator the regulation is
positive.
low.
zero.
high.
positive.
low.
zero.
high.
Answer
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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be
1.4 mWb.
3.5 mWb.
2.7 mWb.
1.2 mWb.
1.4 mWb.
3.5 mWb.
2.7 mWb.
1.2 mWb.
Answer
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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as
45 ppm.
20 ppm.
35 ppm.
25 ppm.
45 ppm.
20 ppm.
35 ppm.
25 ppm.
Answer
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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
wave-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
lap-wound machine will have more rated voltage and less current
wave-wound machine will have more rated current and more voltage
wave-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
lap-wound machine will have more rated voltage and less current
Answer
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