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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
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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°
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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 - 250°C
B.6 - 12 kg/cm2 and 250 - 350°C
C.12 - 20 kg/cm2 and 350 - 450°C
D.20 - 30 kg/cm2 and 450 - 500°C
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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
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19. The maximum temperature in the I.C. engine cylinder is of the order of
A.500 - 1000°C
B.1000 - 1500°C
C.1500 - 2000°C
D.2000 - 2500°C
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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
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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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