SSC JE Electrical 15 Nov 2022 Shift 2 Paper
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Question : 115 of 200
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A 10,000 KVA, 3-phase, star-connected 11,000 V, 2-pole turbo generator has the following losses.
(i) Open circuit core loss at 11000 V = 80 kW;
(ii) Windage and frictional loss = 40 kW;
(iii) Full load armature copper loss = 200 kW; and,
(iv) Field copper loss = 90 kW.
Ignoring the change in field current compute the percentage efficiency at rated load 0.8 pf leading.
(i) Open circuit core loss at 11000 V = 80 kW;
(ii) Windage and frictional loss = 40 kW;
(iii) Full load armature copper loss = 200 kW; and,
(iv) Field copper loss = 90 kW.
Ignoring the change in field current compute the percentage efficiency at rated load 0.8 pf leading.
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