Internal Combustion Engine — Summer 2022

Compare S.I. and C.I. engine.

Explain the emission of S.I. and C.I. engine.

Compare properties of alternate fuels with Petrol and Diesel.

Define Stoichiometric, Rich and Lean mixture.

With neat sketch describe the simple carburetor.

Explain the working of M.P.F.I. system. State its advantages over carburetor.

Derive air fuel ratio through approximate analysis of simple carburetor.

How to control knocking tendency in S.I. engine?

Explain knocking in S. I. engine.

Explain stages of combustion in S. I. engine.

How to control knocking tendency in C.I. engine?

Explain Knocking in C. I. engine.

Explain stages of combustion in C.I. engine.

Explain supercharger.

Compare air cooling system with water cooling system.

With neat sketch explain working of full pressure lubrication system.

Explain turbocharger.

Compare wet sump lubrication with dry sump lubrication system

With neat sketch explain working of pressurized water cooling system.

Explain air box method to calculate the air consumption.

What are the requirements of a good fuel injection system for C.I. Engine?

In a test of 4 cylinder 4 stroke petrol engine having 80 mm bore and 110 mm stroke. The following results were obtained at full throttle at a constant speed and with a fixed setting of the fuel supply of 0.09 kg/min. B. P. with all cylinder working = 16.5 kW B. P. with cylinder 1 cut off = 11. 35 kW1 B. P. with cylinder 2 cut off = 10. 95 kW B. P. with cylinder 3 cut off = 11. 45 kW B. P. with cylinder 4 cut off = 11. 65 kW Calculate the indicated power, mechanical efficiency, Indicated thermal efficiency and air standard efficiency of the engine. Take calorific value of fuel is 44 MJ/kg. The clearance volume of engine is 120 cc.

Explain Willan’s line method to find friction power of the engine.

Explain C.R.D.I. system.

Explain heat balance sheet for engine.