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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 a typical medium speed 4 stroke cycle diesel engine_______________?
A exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
B exhaust valve opens at bottom ‘dead center and closes at top dead center
C exhaust valve opens just after bottom dead center and closes just before top dead center
D may open and close anywhere
Correct Answer: exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
Supercharging is essential in_____________?
A diesel engines
B gas turbines
C petrol engines
D aircraft engines
Correct Answer: aircraft engines
The reason for supercharging in any engine is to________________?
A increase efficiency
B increase power
C reduce weight and bulk for a given out-put
D effect fuel economy
Correct Answer: reduce weight and bulk for a given out-put
The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?
A equal to stroke volume
B equal to stroke volume and clearance volume
C less than stroke volume
D more than stroke volume
Correct Answer: less than stroke volume
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?
A higher
B lower
C remain unaffected
D unpredictable
Correct Answer: higher
Which of the following statement is wrong ?
A The mortise gauge has two scribing pins
B The gouges are chisels with a hollow shaped blade
C An auger is a planning tool
D all of these
Correct Answer: An auger is a planning tool
The operation of straightening a curved sheet metal, is known as____________________?
A squeezing
B coining
C planishing
D drawing
Correct Answer: planishing
Tandem drawing of wires and tubes is necessary because_________________?
A accuracy in dimensions is not possible otherwise
B surface finish improves after every drawing stage
C it is not possible to reduce at one stage
D annealing is needed between stages
Correct Answer: annealing is needed between stages
The shrinkage allowance for cast iron pattern is________________?
A 15 mm/m
B 20 mm/m
C 26 mm/m
D 10 mm/m
Correct Answer: 10 mm/m
In spot welding, the spacing between two spot weld should not be less than _______________?
A d
B 1.5d
C 3d
D 6d
Correct Answer: d
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