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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

In a typical medium speed 4-stroke cycle diesel engine________________?
A compression starts at 35° after bottom dead center and ends at top dead center
B compression starts at bottom dead center and ends at top dead center
C compression starts at 10° before bottom dead center and, ends just before top dead center
D may start and end anywhere
Correct Answer: compression starts at 35° after bottom dead center and ends at top dead center
The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?
A more
B loss
C same
D may be more or less depending on engine capacity
Correct Answer: loss
The specific fuel consumption per BHP hour for diesel engine is approximately___________________?
A 0.15 kg
B 0.2 kg
C 0.25 kg
D 0.3 kg
Correct Answer: 0.2 kg
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?
A 80°C
B 120°C
C 180°C
D 240°C
Correct Answer: 80°C
Combustion in compression ignition engines is____________________?
A homogeneous
B heterogeneous
C both A. and B.
D laminar
Correct Answer: heterogeneous
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
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