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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 ignition coil in diesel engines produces voltage of the order of________________?
A 6 to 12 volts
B 240 volts
C 1000 volts
D 20,000 volts
Correct Answer: 20,000 volts
In petrol engines, advancing the spark timing will_______________?
A increase the knocking tendency
B decrease the knocking tendency
C not affect the knocking tendncy
D increase or decrease knocking tendency depending on strenght and time of spark
Correct Answer: increase the knocking tendency
The essential equipment for producing high vlotage for sparking in petrol engines with battery is_______________?
A ignition coil
B ignition coil and distributor
C ignition coil and condenser
D ignition coil and contact breaker
Correct Answer: ignition coil
For low speed operation or for idling in petrol engines, the engine requirements are for_______________?
A lean mixture
B theoretically correct mixture
C rich mixture
D any type of mixture
Correct Answer: rich mixture
Power impulses from an I.C. engine are somoothed out by__________________?
A governor
B crank shaft
C gear box
D flywheel
Correct Answer: flywheel
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
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