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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 included angle in unified of American National threads is___________________?
A 60°
B 55°
C 47°
D 29°
Correct Answer: 60°
A tap bolt_____________________?
A has a head on one end and a nut fitted to the other
B has head at one end and other end fits into a tapped hole in the other part o be joined
C has both the ends threaded
D has pointed threads
Correct Answer: has head at one end and other end fits into a tapped hole in the other part o be joined
A stud________________________?
A has a head on one end and a nut fitted to the other
B has head at one end and other end fits into a tapped hole in the other part to be joined
C has both the ends threaded
D has pointed threads
Correct Answer: has both the ends threaded
Maximum principal stress theory is applicable for_____________________?
A ductile materials
B brittle materials
C elastic materials
D all of the above
Correct Answer: brittle materials
The crest diameter of a screw thread is same as _____________________?
A major diameter
B minor diameter
C pitch diameter
D core diameter
Correct Answer: major diameter
At low temperatures (say 75°C) the notched-bar impact value of steel____________________?
A increases markedly
B decreases markedly
C remains same
D depends on heat treatment carried out
Correct Answer: decreases markedly
The ratio of endurance limit in shear to the endurance limit in flexure is__________________________?
A 0.33
B 0.4
C 0.5
D 0.55
Correct Answer: 0.5
Residual stress in materials_________________?
A acts when external load is applied
B becomes zero when external load is removed
C is independent of external loads
D is always harmful
Correct Answer: is independent of external loads
Cold working________________?
A increases the fatigue strength
B decreases the fatigue strength
C has no influence on fatigue strength
D alone has no influence on fatigue strength
Correct Answer: increases the fatigue strength
Which process will increase the fatigue duration of parts ?
A finishing and polishing
B shot-peening
C decarburisation
D electroplating
Correct Answer: shot-peening
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