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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?
10°.
24°.
30°.
45°.
10°.
24°.
30°.
45°.
Answer
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Related Question
Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?
90 V.
60 V.
40 V.
30 V.
90 V.
60 V.
40 V.
30 V.
Answer
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Electrical Machines
Synchronous condensers are used to
reduce hunting
improve starting torque
improve the power factor
All of these
reduce hunting
improve starting torque
improve the power factor
All of these
Answer
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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will
produce sparking at brushes.
draw too much current.
open fuse or circuit breaker.
develop excessive speed and damage itself.
produce sparking at brushes.
draw too much current.
open fuse or circuit breaker.
develop excessive speed and damage itself.
Answer
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Electrical Machines
For power factor improvement the synchronous motor is to be
lightly loaded and underecited
heavily loaded and over excited
heavily loaded and underexcited
lightly loaded and over excited
lightly loaded and underecited
heavily loaded and over excited
heavily loaded and underexcited
lightly loaded and over excited
Answer
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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 = 4*ωm
ωe = 2*ωm
ωe = 1/2*ωm
ωe = ωm
ωe = 4*ωm
ωe = 2*ωm
ωe = 1/2*ωm
Answer
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