A. increases markedly
B. decreases markedly
C. remains same
D. depends on heat treatment carried out
E. none of the above
Related Mcqs:
- 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 - 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
C. decrease with decrease in y
D. depend on other considerations
E. none of the above - The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________?
A. same in both cases
B. 2 times more
C. 3 times more
D. 4 times more
E. unpredictable - 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 - 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 - The notch angle of the Izod impact test specimen is________________?
A. 10°
B. 20°
C. 30°
D. 45°
E. 60°. - Brittle coating technique is used for_________________?
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 - Cold working________________?
A. increases the fatigue strength
B. decreases the fatigue strength
C. has no influence on fatigue strength
D. alone has no influence on fatigue strength
E. none of the above - If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation_______________?
A. 102 d
B. 124 d
C. 138 d
D. 151 d
E. 168 d - When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?
A. shank
B. head
C. in the middle
D. at the thread
E. anywhere in the bolt
