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Machine Design MCQ Questions & Answers | Mechanical Engineering

Learn Machine Design MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Machine Design MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-8 section-2

Each section contains 100 MCQs on Machine Design .
71
The process extensively used for making bolts and nuts is
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
72
In a marine flange coupling, the pitch circle diameter of bolts is taken as
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
73
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.
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Answer & Solution
Answer: Option A
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74
In a steam engine, the valve rod is connected to an eccentric rod by means of
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Answer & Solution
Answer: Option B
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75
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
76
Cap screws are
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
77
All stresses produced in a belt are
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
78
The included angle for the British Association thread is
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Answer & Solution
Answer: Option C
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79
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
80
In nitrated parts, the origins of the fatigue cracks will occur at
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Answer & Solution
Answer: Option B
Solution:
Nitriding is a surface-hardening process that diffuses nitrogen into the surface, creating a hard, wear-resistant case with compressive residual stresses.

Fatigue crack initiation: Due to the compressive stresses at the surface, fatigue cracks are generally suppressed at the outer layer. Instead, they tend to originate just below the surface, where the protective effect of compressive stress is lower.

Why not surface: Although surface imperfections can sometimes cause cracks in practice, the theoretical and exam-oriented answer is that cracks start just beneath the hardened case.

Conclusion: From an exam perspective, the correct answer is Option B: Just below the surface.