Internal Combustion Engines, Question Paper of B.Tech 4th Semester,Download Previous Years Question Paper 4

Roll No. ......................

Total No. of Questions : 09]

B.Tech. (Sem. – 4th)

INTERNAL COMBUSTION ENGINES

SUBJECT CODE : AE - 202

Paper ID : [A0708]

Time : 03 Hours

Instruction to Candidates:

1) Section - A is Compulsory.

2) Attempt any Four questions from Section - B.

3) Attempt any Two questions from Section - C.

Section - A

1.     Write short notes on :

a.     Name the two general classes of combustion engine.

b.     What is an air standard efficiency ?

c.      State the application of C.I. Engine.

d.     Write the advantages of induction swirl.

e.      Define Combustion.

f.       What do you mean by term ‘carburetion’?

g.     What are the main function of a nozzle?

h.     What are additives?

i.       What is supercharging?

j.       Write the demerits of under cooling.

Section –B

2.     Explain with suitable sketch the working of a four stroke otto engine.

3.     Explain briefly the combustion phenomenon in C.I. engtines.

4.     What is ignition lag? Discuss the effect of engine variables on ignition lag.

5. With the help of neat sketch explain the working principle of simple

carburettor.

6. A two stroke cycle internal combustion engine has a mean effective

pressure of 6 bar. The speed of the engine is 1000 r.p.m. if the diameter

of piston and stroke are 110 mm and 140 mm respectively, find the

indicated power developed.                   

SECTION-C

7. Explain the following terms as applied to I.C. Engine:

(a) Bore                (b) Swept Volume

(c) Stroke             (d) Compression Ratio

(e) T.D.C.             (f) Piston Speed

(g) B.D.C.             (h) Clearance Volume

8. Derive expression of efficiency for carnot cycle.

9. An un-supercharged petrol engine develops 735 kW with air fuel ratio

12.8. The bsfc in 0.350 kg/kWh and mechanical efficiency 86%. The

inlet pressure is 730 mm of mercury absolute and the mixture temperature

is 323 K. The engine is supercharged to a pressure ratio of 1.6 by a

supercharger of adiabatic efficiency 0.7 and mechanical efficiency 0.9.

Assuming that air fuel ratio remains unchanged and I.P. is proportional to

inlet density, calculate the power required to run the supercharger. Assume

the volumetric efficiency does not change due to supercharging.