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Electrical Machines

Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs load current
 Vt vs Ia
 Eg vs load current
 Eg vs Ia

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 1500 rpm
 3000 rpm
 4000 rpm

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 near to 1.
 0.25.
 0.5.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 600 A.
  3600 A.
 1200 A.
 2400 A.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 power factor and dc excitation at constant load
 power factor and supply voltage during hunting
 supply voltage and field current at constant excitation
All of these

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

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

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MORE MCQ ON Electrical Machines

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