Machine Design - Mechanical Engineering Multiple Choice Questions and Answers for Compitations exams

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

2.    The pci Tnissible stress for carbon steel under static loading is generally taken as
(a)    2000-3000 kg/pm2
(b)    3000-4000 kg/cm2
(c)    4000-J500 kg/cm2
(d)    7500-10,000 kg/cm2
(e)    10,000-15,000 kg/cm2.
Ans: c

3.    The property of a material which enables it to resist fracture due to high impact loads is known as
(a) elasticity   
(b) endurance
(c) strength   
(d) toughness
(e) resilience.
Ans: d

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
(a) brittle   
(b) ductile
(c) elastic   
(d) plastic
(e) tough.
Ans: b

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

7.    If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows
(a) vpE   
(b) vVvF
(c) WpE/2   
(d) IvHpE
(e) none of the above, where E = modulus of elasticity and p = mass density.
Ans: a

8.    Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
(a)     Brinell   
(b)     Rockwell
(c)    Vicker
(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.
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

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Machine Design - Mechanical Engineering MCQs Part1
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