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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 carburettors, the top of the fuel jet with reference to the level in the float chamber is kept at_________________?
A same level
B slightly higher level
C slightly lower level
D may be anywhere
Correct Answer: slightly higher level
In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?
A 0.85
B 1
C 1.1 to 1.3
D 1.2 to 1.5
Correct Answer: 1
In petrol engine, increase of cooling water temperature will_________________?
A increase the knocking tendency
B decrease the knocking tendecny
C not affect the knocking tendency
D increase or decrease knocking tendency depedning on strength and time of spark
Correct Answer: increase the knocking tendency
The pour point of diesel oil must be_________________?
A lower than the coldest atmospheric temperature at which oil is to be pumped
B higher than above
C has no such relation
D more than 100°C
Correct Answer: lower than the coldest atmospheric temperature at which oil is to be pumped
High carbon content in diesel oil used for diesel engine leads to_________________?
A production of highly corrosive gases corroding the cylinder walls and exhaust system
B excessive engine wear
C damaging of both the storage tank and the engine
D deposition on engine parts
Correct Answer: deposition on engine parts
Ignition timing of a multicylider petrol engine can be adjusted by_________________?
A rotating the crank
B adjusting the spark plug gap
C adjusting ignition coil position
D rotating the distributor
Correct Answer: rotating the distributor
The cooling water requirement for diesel engine is of the order of________________?
A 0.2 to 1.0 liter per minute per h.p.
B 1 to 3 liters per minute per h.p.
C 5 to 10 liters per minute per h.p
D 10 to 20 liters per minute per h.p.
Correct Answer: 1 to 3 liters per minute per h.p.
Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?
A increases.
B decreases
C remains same
D unpredictable
Correct Answer: decreases
The function of a distributor in an automobile is to__________________?
A distribute charge, equally to all the cylinders
B regulate power
C feed lub oil to all moving parts
D time the spark
Correct Answer: time the spark
For same power and same speed, the flywheel of a four stroke engine as compared to two-stroke I.C. engine will be________________?
A smaller
B bigger
C same size
D dependent on other engine parameters
Correct Answer: bigger
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