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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 isochronous governing, speed droop is_______________?
A 100%
B 50%
C 30%
D
Correct Answer: 30%
An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________?
A 2%
B 4%
C 8%
D ±4%
Correct Answer: 4%
If diesel is fed by mistake in the oil tank of a petrol engien, then engine will________________?
A give lot of smoke
B detonate
C knock
D not run
Correct Answer: not run
For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?
A about twice
B about 0.5 times
C nearly equal
D about 1.7 times
Correct Answer: about 1.7 times
For low load operation, more suitable (economical) engine is_______________?
A S.I. engine
B C.I. engine
C both are equally good
D multicylinder engine
Correct Answer: C.I. engine
Hot air standard diesel cycle efficiency with increase in value of C„_______________?
A increases
B decreases
C remains unaffected
D depends on other factors
Correct Answer: decreases
Which of the following engines can work on very lean mixture__________________?
A S.I. engine
B C.I. engine
C two stroke engine
D four stroke engine
Correct Answer: C.I. engine
In open combustion chamber in diesel engines____________________?
A the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
B fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
C only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
D fuel is injected at atmospheric pres¬sure
Correct Answer: the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?
A increase the knocking tendency
B decrease the knocking tendency
C not affect the knocking tendency
D increase or decrease knocking tendency depending on strength and time of spark
Correct Answer: increase the knocking tendency
The thermal efficiency of a diesel engine is of the order of_________________?
A 92%
B 68%
C 52%
D 34%
Correct Answer: 34%

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