IE Engines Quiz Questions Test1

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1. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
1/2	1
2	4

2. In a diesel engine, the fuel is ignited by ______.
spark	injected fuel
heat resulting from compressing air that is supplied for combustion	ignitor

3. Scavenging air in diesel engine means
air used for combustion sent under pressure	forced air for cooling cylinder
burnt air containing products of combustion	air used for forcing burnt gases out of engine's cylinder during the exhaust period

4. Supercharging is the process of _____.
supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere	providing forced cooling air
injecting excess fuel for raising more load	supplying compressed air to remove combustion products fully

5. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
yes	no
to some extent	unpredictable

6. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called _____.
net efficiency	efficiency ratio
relative efficiency	overall efficiency

7. Compression ratio of LC. engines is ______.
the ratio of volumes of air in cylinder before compression stroke and after compression stroke	volume displaced by piston per stroke and clearance volume in cylinder
ratio of pressure after compression and before compression	swept volume/cylinder volume

8. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is _____.
same	less
more	more or less depending on power rating

9. The calorific value of gaseous fuels is expressed in terms of ______.
kcal	kcal/kg
kcal/m2	kcal/n?

10. If the intake air temperature of I.C. engine increases, its efficiency will ____.
increase	decrease
remain same	unpredictable

11. All heat engines utilise ______.
low heat value of oil	high heat value of oil
net claorific value of oil	calorific value of fuel

12. An engine indicator is used to determine the following _____.
speed	temperature
volume of cylinder	m.e.p. and I.H.P.

13. Fuel oil consumption guarantees for I .C. engine are usually based on ____.
low heat value of oil	high heat value of oil
net calorific value of oil	calorific value of fuel

14. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be
2%	4%
8%	14%

15. In case of gas turbines, the gaseous fuel consumption guarantees are based on
high heat value	low heat value
net calorific value	middle heat value

16. In a typical medium speed 4-stroke cycle diesel engine the inlet valve
opens at 20° before top dead centre and closes at 35° after the bottom dead centre	opens at top dead centre and closes at bottom dead centre
opens at 10° after top dead centre and closes 20° before the bottom dead centre	may open or close anywhere

17. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of _____.
4 - 6 kg/cm2 and 200 - 250°C	6 - 12 kg/cm2 and 250 - 350°C
12 - 20 kg/cm2 and 350 - 450°C	20 - 30 kg/cm2 and 450 - 500°C

18. The pressure at the end of compression in the case of diesel engine is of the order of ______.
6 kg/cm	12kg/cmz
20 kg/cmz	35 kg/cm

19. The maximum temperature in the I.C. engine cylinder is of the order of ______.
500- 1000°C	1000- 1500°C
1500-2000°C	2000-2500°C

20. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will_____.
increase	decrease
be independent	may increase or decrease depending on other factors