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.Management Sciences
Category: I.C. Engines
The air-fuel ratio in petrol engines-is controlled by__________________?
A. controlling valve opening/closing
B. governing
C. injection
D. carburettion
E. scavenging and supercharging
If overhead clearance is less, then the following type of engine should be selected__________________?
A. V-type
B. In-line
C. Vertical
D. Horizontal
E. Radial
The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?
A. 5:25:30:50
B. 25:35:5:35
C. 25:5:10:60
D. 40:30:15:15
E. 25:5:35:35
The pour point of diesel oil must be_________________?
A. lower than the coldest atmospheric temperature at which oil is to be pumped
B. higher than above
C. has no such relation
D. more than 100°C
E. none of the above
In a typical medium speed 4 stroke cycle diesel engine_______________?
A. exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
B. exhaust valve opens at bottom ‘dead center and closes at top dead center
C. exhaust valve opens just after bottom dead center and closes just before top dead center
D. may open and close anywhere
E. none of the above is true
An engine indicator is used to determine the following___________________?
A. speed
B. temperature
C. volume of cylinder
D. m.e.p. and I.H.P.
E. BHP
Pick up the wrong statement about supercharging __________________?
A. supercharging reduces knocking in diesel engines
B. there can be limited supercharging in petrol engines because of detonation
C. supercharging at high altitudes is essential
D. supercharging results in fuel economy
E. supercharging is essential in aircraft engines
Which of the following is not an interns combustion engine___________________?
A. 2-stroke petrol engine
B. 4-stroke petrol engine
C. diesel engine
D. gas turbine
E. steam turbine
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