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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is
440 A.
40 A.
44 A.
400 A.
440 A.
40 A.
44 A.
400 A.
Answer
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Related Question
Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by
Vt = Ea + Ia(ra + rs)
Vt= Ea + Iara
Vt = Ea + Iara+ ILrs
Vt= Ea– Iara
Vt = Ea + Ia(ra + rs)
Vt= Ea + Iara
Vt = Ea + Iara+ ILrs
Vt= Ea– Iara
Answer
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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is
cumulatively compounded.
shunt connected.
series connected.
deferentially compounded.
cumulatively compounded.
shunt connected.
series connected.
deferentially compounded.
Answer
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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is
600 rpm.
3600 rpm.
500 rpm.
3000 rpm.
600 rpm.
3600 rpm.
500 rpm.
3000 rpm.
Answer
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Electrical Machines
For a dc machine shunt resistance and armature resistance values are
high and low
low and low
low and high
high and high
high and low
low and low
low and high
high and high
Answer
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Electrical Machines
In an alternator the voltage generated per phase is proportional to
flux per pole.
All of these
number of turns in coil.
frequency of waveform.
flux per pole.
All of these
number of turns in coil.
frequency of waveform.
Answer
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