A large truck has a supercharged V10 SI engine with a displacement of which is equipped with variable compression ratio. The Otto cycle engine is operated in two different modes, high load when...

A large truck has a supercharged V10 SI engine with a displacement of which is equipped with variable compression ratio. The Otto cycle engine is operated in two different modes, high load when starting up or going up a hill and low load when cruising on level roadway. The operating conditions are as follows:

Calculate:

(a) Indicated thermal efficiency at high load and at low load. [%]

(b) Rate of fuel flow into engine at high load and at low load. [%]

(c) Indicated power at high load and at low load. [hp]

(d) The isfc at high load and at low load. [lbm/hp-hr]