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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

Deposition of carbon in petrol engine cylinder would result in increase of__________________?
A clearance volume
B swept volume
C compression ratio
D volumetric efficiency
Correct Answer: compression ratio
If petrol is used in a diesel engine, then______________?
A higher knocking will occur
B efficiency will be low
C low power will be produced
D black smoke will be produced
Correct Answer: higher knocking will occur
In turbulence chamber in diesel engine__________________?
A the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of 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 there are no valves
Correct Answer: fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?
A Supercharged
B Not supercharged
C Charged
D Supercharged provided its speed is low
Correct Answer: Not supercharged
A two stroke engine is usually identified by__________________?
A size of flywheel
B weight of engine
C type of lubrication system
D absence of valves
Correct Answer: absence of valves
In the case of compression ignition engine, the %age of CO in exhaust gases is________________?
A Zero
B 5-10%
C Depends on load
D Considerable percent
Correct Answer: Zero
The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?
A increase
B decrease
C remain unaffected
D increase/decrease depending upon engine capacity
Correct Answer: increase
In precombustion chamber in diesel engine________________?
A The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of 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 There are no valves
Correct Answer: 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
In a diesel engine, injection pressure developed by injector is of the order of______________?
A 10 kg/cm2
B 100 kg/cm2
C 500 kg/cm2
D 1400 kg/cm2
Correct Answer: 1400 kg/cm2
In the case of petrol engine at maximum output, the percentage of CO in exhaust gases is ____________________?
A Zero
B 5-10%
C Depends on load and quality of fuel
D Considerable percent
Correct Answer: Considerable percent
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