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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

Diesel engines as compared to petrol engines require ______________________?
A bigger flywheel
B smaller flywheel
C same size flywheel
D no flywheel
Correct Answer: bigger flywheel
The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?
A lean mixture
B chemically correct mixture
C rich mixture
D unpredictable
Correct Answer: lean mixture
Air injection in I.C. engines refers to injection of___________________?
A air only
B liquid fuel only
C liquid fuel and air
D supercharging
Correct Answer: liquid fuel and air
With increase in speed of vehicle, the back pressure will________________?
A decrease
B increase
C remain unalfected
D depend on other factors
Correct Answer: increase
A 4-stroke diesel engine needs about following amount of air_________________?
A 75 cc per min. per h.p.
B 750 cc per min. per h.p.
C 7500 cc per min. per h.p.
D 75000 cc per min. per h.p.
Correct Answer: 75000 cc per min. per h.p.
Fuel consumption with increase in back pressure will________________?
A increase
B decrease
C remain unaffected
D depend on other factors
Correct Answer: increase
The ash content in diesel oil should bot be more than_______________?
A 1%
B 5%
C 0.1%
D 0.01%
Correct Answer: 1%
A fuel will detonate less if it has___________________?
A higher self ignition temperature
B lower self ignition temperature
C proper self ignition temperature
D self ingition temperature has nothing to do with detonation
Correct Answer: higher self ignition temperature
Pick up the wrong statement about supercharging __________________?
A supercharging reduces knocking in diesel engines
B there can be limited supercharging in petrol engines because of detonation
C supercharging at high altitudes is essential
D supercharging results in fuel economy
Correct Answer: supercharging results in fuel economy
Which of the following statements is correct ?
A All the irreversible engines have same efficiency
B All the reversible engines have same efficiency
C Both Rankine and Caront cycles have same efficiency between same temperature limits
D All reversible engines working between same temperature limits have same-efficiency
Correct Answer: All reversible engines working between same temperature limits have same-efficiency
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