Mechanical Engineering Questions And Answers :: Engineering Materials: part1



Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part1 : 16 to 20

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2014 and IES 2014 examinations :

16.The elastic stress strain behavior of rubber is

linear
non-linear
plastic
no fixed relationship
unpredictable behavior.

17.Stress relaxation is- the phenomenon

in which parts are not loaded
in which stress remains constant on increasing load
in which deformation tends to loosen the joint and produces a stress reduced
stress reduces on increasing load
none of the above.

18.A material is known as allotropic or polymorphic if it

has a fixed structure under all conditions
exists in several crystal forms at different temperatures
responds to heat treatment
has its atoms distributed in a random pattern
none of the above.

19.The ultimate tensile strength of low carbon steel by working at a high strain rate will

decrease
increase
remain constant
first increase and then decrease
first decrease and then increase.

20.Isotropic materials are those which have the same

elastic properties in all directions
stresses induced in all directions
thermal properties in all directions
electric and magnetic properties in all directions
density throughout.

More Engineering Materials QUESTIONS AND ANSWERS available in next pages

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