An 6.6 kV. three-phase star-connected synchronous motor is working at full load and draws a curren of is-200 A at 0.8 p.f. leading. The armature resistance is 1.20 and synchronous reactance is 6 0 per phase. The rotational losses are 3 kW. Determine efficiency of the motor. a. 61% b. 67% c. 83% d. 96% e. 73% f. 88% g. 92%

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QUESTION 12
An 6.6 kV. three-phase star-connected synchronous motor is working at full load and draws a curren of is-200 A at 0.8 p.f. leading. The
armature resistance is 1.20 and synchronous reactance is 60 per phase. The rotational losses are 3 kW.
Determine efficiency of the motor.
a. 61%
b. 67%
c. 83%
d. 96%
e. 73%
f. 88%
g. 92%
h. 78%
Transcribed Image Text:QUESTION 12 An 6.6 kV. three-phase star-connected synchronous motor is working at full load and draws a curren of is-200 A at 0.8 p.f. leading. The armature resistance is 1.20 and synchronous reactance is 60 per phase. The rotational losses are 3 kW. Determine efficiency of the motor. a. 61% b. 67% c. 83% d. 96% e. 73% f. 88% g. 92% h. 78%
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