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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

Hot air standard diesel cycle efficiency with increase in value of C„_______________?
A increases
B decreases
C remains unaffected
D depends on other factors
Correct Answer: decreases
Which of the following engines can work on very lean mixture__________________?
A S.I. engine
B C.I. engine
C two stroke engine
D four stroke engine
Correct Answer: C.I. engine
In open combustion chamber in diesel engines____________________?
A the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on 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 fuel is injected at atmospheric pres¬sure
Correct Answer: the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?
A increase the knocking tendency
B decrease the knocking tendency
C not affect the knocking tendency
D increase or decrease knocking tendency depending on strength and time of spark
Correct Answer: increase the knocking tendency
The thermal efficiency of a diesel engine is of the order of_________________?
A 92%
B 68%
C 52%
D 34%
Correct Answer: 34%
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
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