engineering recuitment Indian Coast Guard Yantrik Mock Test 2024 Electrical Machines Alternator and Synchronous Motors Tests of Synchronous Machine
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.
1
86.62
2
91.23
3
88.27
4
95.12