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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?
ωe = ωm
ωe = 2*ωm
ωe = 1/2*ωm
ωe = 4*ωm
ωe = ωm
ωe = 2*ωm
ωe = 1/2*ωm
ωe = 4*ωm
Answer
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Related Question
Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.
220 V.
240 V.
150 V.
280 V.
220 V.
240 V.
150 V.
280 V.
Answer
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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards
direction of flux.
opposite to the direction of motion of the conductor.
direction of induced emf.
direction of motion of the conductor.
direction of flux.
opposite to the direction of motion of the conductor.
direction of induced emf.
direction of motion of the conductor.
Answer
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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is
3000 rpm.
500 rpm.
3600 rpm.
600 rpm.
3000 rpm.
500 rpm.
3600 rpm.
600 rpm.
Answer
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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as
2 X 1012 Ω - cm at 27°C and 0.2 X 1012
3 X 1012 Ω - cm at 27°C and 0.3 X 1012
4 X 1012 Ω - cm at 27°C and 0.4 X 1012
1 X 1012 Ω - cm at 27°C and 0.1 X 1012
2 X 1012 Ω - cm at 27°C and 0.2 X 1012
3 X 1012 Ω - cm at 27°C and 0.3 X 1012
4 X 1012 Ω - cm at 27°C and 0.4 X 1012
1 X 1012 Ω - cm at 27°C and 0.1 X 1012
Answer
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Electrical Machines
Exciting current of an induction motor is
equal as power transformer.
lesser than power transformer.
none of these.
higher than power transformer.
equal as power transformer.
lesser than power transformer.
none of these.
higher than power transformer.
Answer
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