TOP Machine Design - Mechanical Engineering Multiple choice Questions and Answers
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Course
Mechanical Engineering
Institution
Mechanical Engineering
138 TOP Machine Design - Mechanical Engineering
Multiple choice Questions and Answers
Latest Machine Design Questions and Answers pdf free download
1. The ultimate strength of steel in tension in comparison to shear is in the ratio of
(a) 1 : l
(b) 2:1
(c) 3 : 2
(d) 2 : 3
(e) 1 : 2
Ans: ...
138 TOP Machine Design - Mechanical Engineering
Multiple choice Questions and Answers
Latest Machine Design Questions and Answers pdf free download
1. The ultimate strength of steel in tension in comparison to shear is in the ratio of
(a) 1 : l
(b) 2:1
(c) 3 : 2
(d) 2 : 3
(e) 1 : 2
Ans: c
ww
w.E
2. The permissible stress for carbon steel under static loading is generally taken as
(a) 2000-3000 kg/pm2
(b) 3000-4000 kg/cm2
(c) 4000-4500 kg/cm2 asy
(d) 7500-10,000 kg/cm2
(e) 10,000-15,000 kg/cm2. En
Ans: c
gin
eer
3. The property of a material which enables it to resist fracture due to high impact loads is known as
(a) elasticity
(b) endurance
ing
(c) strength .ne
(d) toughness
(e) resilience.
Ans: d
t
4. A hot short metal is
(a) brittle when cold
(b) brittle when hot
(c) brittle under all conditions
(d) ductile at high temperature
(e) hard when hot.
Ans: b
5. Guest's theory of failure is applicable for following type of materials
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6. Rankine's theory of failure is applicable for following type of materials
(a) brittle
(b) ductile
(c) elastic
(d) plastic
(e) tough.
Ans: a ww
w.E
7. If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid
asy
bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as
follows
(a) vpE
(b) vVvF En
(c) WpE/2
gin
(d) IvHpE
(e) none of the above, where E = modulus of elasticity and p = mass density. eer
Ans: a
ing
8. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test .ne
(a)
(b)
Brinell
Rockwell
(c) Vicker
t
(d) Shore's sceleroscope
(e) none of the above.
Ans: a
9. Resilience of a material is important, when it is subjected to
(a) combined loading
(b) fatigue
(c) thermal stresses
(d) wear and tear
(e) shock loading.
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, Ans: e
10. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock
load produced can be decreased by
(a) decreasing the cross-section area of' bar
(b) increasing the cross-section area of bar
(c) remain unaffected with cross-section area
(d) would depend upon other factors
(e) none of the above.
Ans: a
11. .Other method of reducing shock load in the above case can be
ww
(a) to decrease length
(b) to increase length
(c) unaffected by length
w.E
(d) other factors would decide same
(e) none of the above.
Ans: b asy
En
gin
12. If a load W is applied instantaneously on a bar; then the stress induced in bar will
(a) be independent of ratio of mass of load W to mass of bar (y)
(b) increase with increase in y eer
(c) decrease with decrease in y
(d) depend on other considerations
ing
(e) none of the above. .ne
Ans: a
13. Brittle coating technique is used for
t
(a) determining brittleness
(b) protecting metal against corrosion
(c) protecting metal against wear and tear
(d) experimental stress analysis
(e) non-destructive testing of metals.
Ans: d
14. Stress concentration is caused due to
(a) variation in properties of material from point to point in a member
(b) pitting at'points or areas at which loads on a member are applied
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