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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

If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________?
A diameter of bolt
B 0.75 x diameter of bolt
C 1.25 x diameter of bolt
D 1.5 x diameter of bolt
Correct Answer: diameter of bolt
Basic hole is one_________________?
A whose upper deviation is zero
B whose lower deviation is zero
C whose lower as well as upper deviations are zero
D does not exist
Correct Answer: whose lower deviation is zero
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?
A 0.4 times
B 0.6 times
C 0.7 times
D 0.8 times
Correct Answer: 0.4 times
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?
A shank
B head
C in the middle
D at the thread
Correct Answer: at the thread
The connecting rod bolts are tightened up with initial tension greater than the external load so that___________________?
A joint may not open up
B bolts are weakest elements
C the resultant load on the bolt would not be affected by the external cyclic load
D bolts will not loosen during service
Correct Answer: the resultant load on the bolt would not be affected by the external cyclic load
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?
A square
B acme
C buttress
D BSW
Correct Answer: buttress
The connecting rod bolts are tightened up so that tightening stress _________________?
A is just sufficient to hold parts together
B approaches yield point
C is 50% of yield point
D is about yield point divided by safety factor
Correct Answer: approaches yield point
Allen bolts are___________________?
A self locking bolts
B designed for shock load
C used in aircraft application
D provided with hexagonal depression in head
Correct Answer: provided with hexagonal depression in head
I.S. specifies following total number of grades of tolerances__________________?
A 18
B 16
C 20
D 22
Correct Answer: 18
In composite or reverse laid ropes___________________?
A direction of twist of wires in strands is opposite to the direction of twist of strands
B direction of twist of wires and strands are same
C wires in two adjacent strands are twisted in opposite direction
D wires are not twisted
Correct Answer: wires in two adjacent strands are twisted in opposite direction
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