Fundamentals of Machine Design (3141907) MCQs

MCQs of Design Against Fluctuating Loads

Showing 1 to 10 out of 11 Questions
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1.
The yield point in static loading is ___________as compared to fatigue loading.
(a) higher
(b) lower
(c) same
Answer:

Option (a)

2.
The stress concentration factor is defined as the ratio of
(a) maximum stress to the endurance limit
(b) nominal stress to the endurance limit
(c) maximum stress to the nominal stress
(d) nominal stress to the maximum stress
Answer:

Option (c)

3.
Stress concentration is caused due to
(a) variation in properties of the material from point to point in a member
(b) pitting at points or areas at which loads on a member are applied
(c) the abrupt change of section
(d) all of the above
Answer:

Option (d)

4.
The fatigue life of a part can be improved by
(a) electroplating
(b) shot peening
(c) polishing
(d) coating
Answer:

Option (b)

5.
Failure of a material is called fatigue when it fails
(a) at the elastic limit
(b) below the elastic limit
(c) at the yield point
(d) below the yield point
Answer:

Option (d)

6.
The resistance to fatigue of a material is measured by
(a) elastic limit
(b) Young’s modulus
(c) ultimate tensile strength
(d) endurance limit
Answer:

Option (d)

7.
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.
(a) same
(b) less
(c) more
Answer:

Option (c)

8.
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for an infinite number of cycles, when subjected to
(a) static load
(b) dynamic load
(c) static as well as dynamic load
(d) completely reversed load
Answer:

Option (d)

9.
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called
(a) repeated stress
(b) fluctuating stress
(c) yield stress
(d) alternating stress
Answer:

Option (b)

10.
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using
(a) Gerber relation
(b) Soderberg relation
(c) Goodman relation
(d) none of these
Answer:

Option (c)

Showing 1 to 10 out of 11 Questions
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