(a) Illustrate why a rich mixture is required for the following
(i) idling (ii) sudden acceleration (iii) Maximum power
(b) A simple jet carburetor is required to supply 5Kg of air and 0.5 Kg of fuel per minute. The fuel specific gravity is 0.75. the air is initially at 1 bar and 300 K. Evaluate the throat diameter of the choke for the flow velocity of 100 m/s. velocity coefficient is 0.8.