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Electrical Machines
When maximum starting torque is obtained, rotor power is
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Electrical Machines
The induction motor shaft is made of
mild steel.
cast iron.
aluminium.
stainless steel.
mild steel.
cast iron.
aluminium.
stainless steel.
Answer
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Electrical Machines
In which of the following generators negative voltage regulation can occur?
series generators
over compound generator
shunt generator
both B and C
series generators
over compound generator
shunt generator
both B and C
Answer
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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?
1037.5 r.p.m.
none of above.
1130 r.p.m.
4575.4 r.p.m.
1037.5 r.p.m.
none of above.
1130 r.p.m.
4575.4 r.p.m.
Answer
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Electrical Machines
Breather is provided in a transformer to
absorb moisture from air entering in transformer.
filter the transformer oil.
absorb moisture of air during breathing.
provide cold air in transformer.
absorb moisture from air entering in transformer.
filter the transformer oil.
absorb moisture of air during breathing.
provide cold air in transformer.
Answer
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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine
both the windings have thick leads
armature winding has thick leads whereas field winding has thin leads
armature winding has thin leads whereas field winding has thick leads
both the windings have thin leads
both the windings have thick leads
armature winding has thick leads whereas field winding has thin leads
armature winding has thin leads whereas field winding has thick leads
both the windings have thin leads
Answer
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