Open-circuit (O.C.) and short-circuit (S.C.) tests on a synchronous machine were performed at a certain excitation and rated speed. If the speed is increased by 10% keeping the excitation same, which of the following statements are true?
1. Open circuit voltage decreases by 10%
2. Short circuit current increases by 10 %
3. Open circuit voltage increases by 10%
4. Short circuit current remains same1
1 and 2
2
2 and 3
3
1 and 4
4
3 and 4