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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / E2
 (V2 - E2) / V2
 (E2 - V2) / V2

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 8 KW.
 0.
 10 KW.
  2 KW.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 eddy-current loss
 temperature rise
 mechanical loss
 hysteresis loss

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Fleming's left hand rule.
 Ampere law.
 Fleming's right hand rule.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% decrease
 36.36% increase
 36.36% increase
 18.18% increase

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 4 time the initial value
 twice the initial value
 1/2 of the initial value

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