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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 remains constant.
 decreases
 increases.

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Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 AC
 DC
 AC and DC

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 zero
 20 V
 40 V

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 half load
 any of the above
 no load

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)1.6 × full Load.
 (Pi / Pc)2 × full Load.
  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc) × full Load.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 generation of voltage.
 electromechanical energy conversion.
 commutation.
 development of torque.

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