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Machine Design QUESTIONS AND ANSWERS

Mechanical Engineering : Machine Design QUESTIONS AND ANSWERS :: part1 : 16 to 20

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.A hot short metal is

brittle when cold

brittle when hot

brittle under all conditions

ductile at high temperature

hard when hot.

17.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

vpE

vVvF

WpE/2

IvHpE

none of the above, where E = modulus of elasticity and p = mass density.

18.Coaxing is the procedure of increasing

metal strength by cycling

metal hardness by surface treatment

metal resistance to corrosion by coating

fatigue limit by overstressing the metal by successively increasing loadings

none of the above.

19.Stress concentration in cyclic loading is more serious in

ductile materials

brittle materials

equally serious in both cases

depends on other factors

unpredictable.

20.Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

dynamic loading

static loading

combined static and dynamic loading

completely reversed loading

all of the above.

More Machine Design QUESTIONS AND ANSWERS available in next pages