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Electrical Machines

Electrical Machines
Maximum power developed depends on

 voltage
 load angle
 reactance
 both 1and 2

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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 = 2*ωm
 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = ωm

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 open circuit and short circuit tests.
 short circuit and slip tests.
 open circuit and zero power factor tests.

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 any of the above.
 three phase to single phase transformation.
 three phase to two phase transformation.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 four.
 two.
 three.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.

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MORE MCQ ON Electrical Machines

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