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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current
None of above.
Increases.
Remains unchanged.
Decreases.
None of above.
Increases.
Remains unchanged.
Decreases.
Answer
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Related Question
Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?
1037.5 r.p.m.
4575.4 r.p.m.
963.8 r.p.m.
1130 r.p.m.
1037.5 r.p.m.
4575.4 r.p.m.
963.8 r.p.m.
1130 r.p.m.
Answer
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Electrical Machines
If a DC Series motor is connected across an AC supply it will
run at normal speed.
burn.
run at lower speed.
not run.
run at normal speed.
burn.
run at lower speed.
not run.
Answer
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Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be
Xd = 10.8Ω and Xq = 8Ω
Xd = 9Ω and Xq = 9.6Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 10.8Ω and Xq = 8Ω
Xd = 9Ω and Xq = 9.6Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Answer
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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance
100Ω
200Ω
50Ω
10Ω
100Ω
200Ω
50Ω
10Ω
Answer
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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :
2 and 3
1 and 2
1 and 3
1, 2 and 3
2 and 3
1 and 2
1 and 3
1, 2 and 3
Answer
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