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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 √3
 1/√3
 1/3

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 460 V
 200 V
 115 V
 230 V

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

None of these
 AC and DC
 DC
 AC

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 4.8% and -3.2%
None of these
 3.2% and -1.6%
 6% and -4%

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 below rated speed
None of these
 both 1 and 2

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Electrical Machines
The armature shaft must be able to with stand

All of these
 Twisting stains due to transmission of torque.
 Bending moment due to weight of the armature.
 Any unbalanced magnetic pull on the armature core.

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