SSE JE Electrical Engineering 24 March 2021 Shift 2 Paper

Consider the following statements with respect to synchronous machines. State whether these statements are true or false.
(a) Armature reaction is demagnetising when a generating machine supplies zero power factor lagging current.
(b) Armature reaction is magnetising when a generating machine supplies zero power factor leading current.
(c) Armature reaction is mostly cross-magnetising, though it has a small demagnetising component, when a generating machine supplies unity power factor current.