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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?
ωe = P/2*ωm
ωe = P*ωm
ωe = 2/P*ωm
ωe = ωm
ωe = P/2*ωm
ωe = P*ωm
ωe = 2/P*ωm
ωe = ωm
Answer
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Related Question
Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.
120 volt.
None of these.
220.4 volt.
218.5 volt.
120 volt.
None of these.
220.4 volt.
218.5 volt.
Answer
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Electrical Machines
Type of single phase motor having highest power factor at full load is
shaded pole type.
capacitor run.
split phase.
capacitor start.
shaded pole type.
capacitor run.
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Answer
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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be
very small, say about 2 or 3 V.
about 100 V.
zero.
250 V.
very small, say about 2 or 3 V.
about 100 V.
zero.
250 V.
Answer
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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to
1/Ia
Ia2
Ia
I/Ia2
1/Ia
Ia2
Ia
I/Ia2
Answer
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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?
100W
60W
80W
40W
100W
60W
80W
40W
Answer
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