5. A six-cylinder four stroke spark ignition engine having a piston displacement of 700 m3 3 per cylinder produced 78 kw

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5. A six-cylinder four stroke spark ignition engine having a
piston displacement of
700 m3
3 per cylinder produced 78 kw at 3200 rpm and consumed 27 kg
of
petrol per hour. The calorific value of petrol is 44 MJ/kg.
Determine:
(i) The volumetric efficiency of engine if air-fuel ratio is 12 and
the intake air is
at 0.9 bar, 32°C;
(il) The brake thermal efficiency;
(ili) The brake torque