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EK-General : 2015/DEC/10 – 2018/DEC/09 – 2022/JUL/09
Question
Q9. With reference to the paralleling of a.c. generators:
(a) outline the requirements of synchronisation; (2)
(b) explain how KW power is shared; (1)
(c) explain how K var power is shared; (1)
(d) state SIX types of damage that may be caused when machines are incorrectly synchronised.(6)
Asked in Year/Month/Ques No.
Marker's Feedback
2018/DEC >> Parts (a) and (b) Most candidates had no problems here.
>> Part (c) A lot of candidates just said damage to stator, damage to rotor, damage to crankshaft etc. The question asked for types of damage and should have been along the lines of deformation, crack propagation and twisting etc.