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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?
A increase
B decrease
C be independent
D may increase or decrease depending on other factors
Correct Answer: decrease
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?
A 2%
B 4%
C 8%
D 14%
Correct Answer: 4%
In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?
A opens at 20° before top dead center and closes at 35° after the bottom dead center
B opens at top dead center and closes at bottom dead center
C opens at 10° after top dead center and closes 20° before the bottom dead center
D may open or close anywhere
Correct Answer: opens at 20° before top dead center and closes at 35° after the bottom dead center
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.
Correct Answer: m.e.p. and I.H.P.
If the intake air temperature of I.C. engine increases, its efficiency will_________________?
A increase
B decrease
C remain same
D unpredictable
Correct Answer: decrease
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?
A net efficiency
B efficiency ratio
C relative efficiency
D overall efficiency
Correct Answer: relative efficiency
In a diesel engine, the fuel is ignited by___________________?
A spark
B injected fuel
C heat resulting from compressing air that is supplied for combustion
D ignition
Correct Answer: heat resulting from compressing air that is supplied for combustion
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?
A same
B less
C more
D more or less depending on power rating
Correct Answer: more
Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
A yes
B no
C to some extent
D unpredictable
Correct Answer: no
Scavenging air in diesel engine means___________________?
A air used for combustion sent under pres-sure
B forced air for cooling cylinder
C burnt air containing products of combustion
D air used for forcing burnt gases out of engine’s cylinder during the exhaust period
Correct Answer: air used for forcing burnt gases out of engine’s cylinder during the exhaust period
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