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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

Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?
A using additives in the fuel
B engine derating i.e. reducing the maxi-mum flow of fuel
C increasing the compression ratio
D adherence to proper fuel specification
Correct Answer: increasing the compression ratio
In a cycle, the spark lasts roughly for ____________________?
A 1 sec
B 0.1 sec
C 0.01 sec
D 0.001 sec
Correct Answer: 1 sec
A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?
A more efficient
B less efficient
C equally efficient
D unperdictable
Correct Answer: more efficient
Most high speed compression engines operate on ___________________?
A Otto cycle
B Diesel cycle
C Dual cycle
D Carnot cycle
Correct Answer: Dual cycle
The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
A 1500 rpm
B 750 rpm
C 3000 rpm
D any value independent of engine speed
Correct Answer: 750 rpm
Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
A the friction is high
B the friction is unpredictable
C the small difference in cooling water temperature or in internal friction has a disproportionate effect
D the engine is rarely operated
Correct Answer: the small difference in cooling water temperature or in internal friction has a disproportionate effect
A heat engine utilises the_________________?
A calorific value of oil
B low heat value of
C high heat value of oil
D mean heat value of oil
Correct Answer: high heat value of oil
The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
A increase linearly
B decrease linearly
C increase parabolically
D decrease parabolically
Correct Answer: decrease linearly
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?
A 250°C
B 500°C
C 1000°C
D 150CPC
Correct Answer: 1000°C
In a typical medium speed, 4-stroke cycle diesel engine ___________________?
A fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
B fuel injection starts at top dead center and ends at 20° after top dead center
C fuel injection starts at just before top dead center and ends just after top deac center
D may start and end anywhere
Correct Answer: fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
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