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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 size of inlet valve of.an engine in comparison to exhaust valve is_________________?
A more
B less
C same
D more/less depending on capacity of engine
Correct Answer: less
The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
A same
B more
C less
D less or more depending on operating conditions
Correct Answer: more
Engine pistons ‘are usually made of aluminium alloy because it_________________?
A is lighter
B wears less
C absorbs shocks
D is stronger
Correct Answer: is lighter
In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
A same
B less
C more
D variable
Correct Answer: more
Polymerisation is a chemical process in which molecules of a compound become________________?
A larger
B slowed down
C smaller
D liquid
Correct Answer: larger
Gaseous-fuel guarantees are based on___________________?
A calorific value of oil
B low heat value of oil
C high heat value of oil
D mean heat value of oil
Correct Answer: low heat value of oil
A 75 cc engine has following parameter as 75 cc ___________________?
A fuel tank capacity
B lub oil capacity
C swept volume
D cylinder volume
Correct Answer: swept volume
Diesel fuel, compared to petrol is_________________?
A less difficult to ignite
B just about the same difficult to ignite
C more difficult to ignite
D highly ignitable
Correct Answer: more difficult to ignite
The air-fuel ratio of the petrol engine is controlled by__________________?
A fuel pump
B governor
C injector
D carburettor
Correct Answer: carburettor
The accunmulation of carbon in a cylinder results in increase of________________?
A clearance volume
B volumetric efficiency
C ignition time
D effective compression ratio
Correct Answer: effective compression ratio
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