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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?
both A and B
None of these
K × input power
(1-K) × input power
both A and B
None of these
K × input power
(1-K) × input power
Answer
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Related Question
Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is
zero.
less than normal speed.
more than normal speed.
normal speed.
zero.
less than normal speed.
more than normal speed.
normal speed.
Answer
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Electrical Machines
Synchronous reactance of an alternator represents
armature reactance and leakage reactance
a reactance operating at synchronous speed
field winding reactance
All of these
armature reactance and leakage reactance
a reactance operating at synchronous speed
field winding reactance
All of these
Answer
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Electrical Machines
Maximum power will be developed when back emf is
equal to supply voltage.
half of the supply voltage.
All of these
double the supply voltage.
equal to supply voltage.
half of the supply voltage.
All of these
double the supply voltage.
Answer
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Electrical Machines
Copper brushes in DC machine are used
None of these
where low voltage and high currents are involved.
where high voltage and low current.
in both of above cases.
None of these
where low voltage and high currents are involved.
where high voltage and low current.
in both of above cases.
Answer
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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 = 2/P*ωm
ωe = P/2*ωm
ωe = P*ωm
ωe = ωm
ωe = 2/P*ωm
ωe = P/2*ωm
ωe = P*ωm
ωe = ωm
Answer
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