The performance of candidates who attempted this question was very poor.  The required response to the various parts of the question are:

(a)       (i)         exhaust system of a motor vehicle.

            (ii)        V is flange
                        W is front exhaust pipe
                        X is intermediate pipe
                        Y is silencer or muffler
                        Z is Tail pipe/Exhaust pipe.

                                                (iii)       The purpose of the component is to:
                                                           

• carry the exhaust gas out of the cylinder.
• reduce the noise emitted by pressure of gas leaving the engine.

(iv)       The purpose of V is to connect the exhaust system
to the manifold

The purpose of Y is to reduce the noise in the exhaust system.

                                    (b)       -           carbon dioxide (CO2)
                                                -           water (H2O).
                                                -           Nitrogen (N2).