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Mechanical Engineering Objective Questions { Internal Combustion Engines }

15. In case of gas turbines, the gaseous fuel consumption guarantees are based on
A.High heat value
B.Low heat value
C.Net calorific value
D.Middle heat value

16. In a typical medium speed 4-stroke cycle diesel engine the inlet valve
A.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
B.Opens at 100 after top dead centre and closes 20 before the bottom dead centre
C.May open or close anywhere
D.Remains open for 200

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

18. The pressure at the end of compression in the case of diesel engine is of the order of
A.6 kg/cm2
B.35 kg/cm2
C.20 kg/cm2
D.27.5 kg/cm2

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

20. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will
C.Be independent
D.May increase or decrease depending on other factors

21. Pick up the wrong statement
A.2-stroke engine can run in any direction
B.Petrol engines occupy more space than diesel engines for same power output
C.Thermal efficiency of 4-stroke engine is more due to positive scavenging
D.Petrol engines work on otto cycle

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