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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

With increase in engine speed, the ignition of spark in petrol engine has to be __________________?
A Unaltered
B Increased
C Decreased
D Advanced
Correct Answer: Advanced
Carburretion is done to________________?
A feed petrol into cylinder
B govern the engine
C break up and mix the petrol with air
D heat up the charge to cylinder
Correct Answer: break up and mix the petrol with air
The theoretically correct mixture of air and petrol is approximately ________________?
A 0.334027778
B 0.500694444
C 0.625694444
D 0.834027778
Correct Answer: 0.625694444
The following type of carburettor is preferred_______________?
A concentric type
B eccentric type
C horizontal type
D vertical type
Correct Answer: concentric type
The part load efficiency of a carburettor is,___________________?
A Maximum
B Optimum
C Poor
D Constant
Correct Answer: Poor
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

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