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Mechanical Engineering
1000 Ic Engine
Quiz 2
Solution
Q.1.
The mechanical friction ___________ with increase in speed.
a) reduces
b) unpredictable
c) increases
d) none of the mentioned
Q.2.
Which of the following is the outlet cooling water temperature for small engines?
a) 60 to 65ºC
b) 80ºC
c) about 50ºC
d) none of the mentioned
Q.3.
The weight per B.P. of air-cooled engine is ___________ than that of water-cooled engine.
a) less
b) unpredictable
c) greater
d) none of the mentioned
Q.4.
Which of the following is/are the correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines?
a) 4-stroke S.I. engine, 4-stroke C.I. engine, 2-stroke S.I. engine
b) 4-stroke C.I. engine, 4-stroke S.I. engine, 2-stroke S.I. engine
c) 4-stroke S.I. engine, 2-stroke S.I. engine, 4-stroke C.I. engine
d) 2-stroke C.I. engine, 4-stroke C.I. engine, 4-stroke S.I. engine
Q.5.
For which of the following engines a prony brake is used to measure brake power?
a) low speed engine
b) variable speed engine
c) single cylinder engine
d) low power engine
Q.6.
Which one of the following event would reduce the volumetric efficiency of a vertical compression ignition engine?
a) exhaust valve closing after top dead center
b) inlet valve closing after bottom dead center
c) inlet valve closing before bottom dead center
d) inlet valve opening before top dead center
Q.7.
Which of the following is the main aim of an engine management system to achieve?
a) low levels of gaseous and particulate emissions
b) high reliability and durability with lowest possible initial cost
c) high power output and torque
d) all of the mentioned
Q.8.
The ignition timings and thermal load on the engine affect the knock limit of _____________ engine.
a) CI
b) SI
c) Both SI & CI
d) None of the mentioned
Q.9.
Which of the following engines will have a heavier flywheel than the remaining ones?
a) 30 kW four stroke diesel engine running at 750 r.p.m
b) 30 kW two stroke diesel engine running at 750 r.p.m
c) 30 kW four stroke petrol engine running at 1500 r.p.m
d) 30 kW two stroke petrol engine running at 1500 r.p.m
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