a) Evaluate 3 factors that affect the Upper Flame Limit and Lower Flame Limit of a combustion mixture. [9 marks ] b) The compositions, limits of flammability and maximum flame velocity of the constituents of a cooking gas are tabulated in Table Q5b: From the data in Table Q5b, for the cooking gas-air mixture determine the: i) Upper limit of flammability in terms of equivalence ratio, [5 marks] ii) Lower limit of flammability in terms of equivalence ratio, [5 marks] iii) Composition required for the maximum velocity and, [3 marks] iv) Maximum flame velocity. [3 marks]