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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-3 section-4

Each section contains 100 MCQs on Machine Design .
21
The material used for brake lining should have __________ coefficient of friction.
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Answer & Solution
Answer: Option B
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22
Form coefficient of spring is
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Answer: Option C
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23
The piston pin bearings in heavy duty diesel engines are
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Answer: Option A
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24
A locking device extensively used in automobile industry is a
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Answer: Option B
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25
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using
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Answer & Solution
Answer: Option B
Solution:
When designing machine components under fluctuating or alternating loads, it is essential to account for fatigue failure.

Different failure theories or criteria are used to estimate the safety of such components, with varying levels of conservativeness.

Gerber relation uses a parabolic curve and is less conservative, allowing for higher allowable stresses.

Goodman relation is linear and more conservative than Gerber but less than Soderberg.

Soderberg relation is the most conservative. It uses the yield strength instead of the ultimate strength for comparison and assumes a linear relation. This provides the lowest permissible stress, making it the safest design for fluctuating loads when using the same factor of safety.

Therefore, using the Soderberg relation yields the most conservative estimates for fluctuating loads.

Correct Answer: Option B: Soderberg relation
26
Creep in belt is due to
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Answer: Option C
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27
The spring mostly used in gramophones is
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Answer: Option C
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28
In designing a connecting rod, it is considered like __________ for buckling about X-axis.
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Answer: Option A
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29
In designing a connecting rod, it is considered like __________ for buckling about Y-axis.
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Answer: Option B
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30
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
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Answer: Option A
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