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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as
they have maximum efficiency and maximum starting torque.
they are capable of operation under range of leading and lagging pf.
these are cheaper in cost, simple and rugged in construction.
they have very good speed regulation.
they have maximum efficiency and maximum starting torque.
they are capable of operation under range of leading and lagging pf.
these are cheaper in cost, simple and rugged in construction.
they have very good speed regulation.
Answer
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Related Question
Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.
decreased.
increased.
kept constant to certain value.
remains same.
decreased.
increased.
kept constant to certain value.
remains same.
Answer
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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be
15.28 Nm
16.55 Nm
15.92 Nm
15.6 Nm
15.28 Nm
16.55 Nm
15.92 Nm
15.6 Nm
Answer
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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?
armature mmf
armature current
All of these
armature flux
armature mmf
armature current
All of these
armature flux
Answer
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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?
Oil impregnated paper.
Vacuum.
Glass.
Mica.
Oil impregnated paper.
Vacuum.
Glass.
Mica.
Answer
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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then
Ia remains constant but ωm increase
both decrese
both armature current Ia and speed ωm increase
Ia increases and ωm decreses
Ia remains constant but ωm increase
both decrese
both armature current Ia and speed ωm increase
Ia increases and ωm decreses
Answer
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