The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________? A. 770°C B. 910°C C. 1050°C D. below recrystallisation temperature E. above recrystallization temperature
Which of the following constituents of steels is softest and least strong ________________? A. austenite B. pearliteC. ferrite D. cementlte E. bainite
A material is known as allotropic or polymorphic if it __________________? A. has a fixed structure under all conditionsB. exists in several crystal forms at different temperatures C. responds to heat treatment D. has its atoms distributed in a random…
Points of arrest for iron correspond to__________________? A. stages at which allotropic forms change B. stages at which further heating does not increase temperature for some time C. stages at which properties do not change with increase in temperature D.…
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________? A. increase B. decrease C. remain same D. first increase and then decrease E. show unpredictable behaviour
The ability of a material to resist softening at high temperature is known as____________________? A. creep B. hot temperingC. hot hardness D. fatigue E. superhardening
Isotropic materials are those which have the same ____________________? A. elastic properties in all directions B. stresses induced in all directions C. thermal properties in all directions D. electric and magnetic properties in all directions E. density throughout
Stress relaxation is- the phenomenon ___________________? A. in which parts are not loaded B. in which stress remains constant on in-creasing loadC. in which deformation tends to loosen the joint and produces a stress reduced D. stress reduces on increasing…
Mild steel belongs to the following category___________________? A. low carbon steel B. medium carbon steel C. high carbon steel D. alloy steel E. special steel
Malleability of a material can be defined as ______________________? A. ability to undergo large permanent deformations in compression B. ability to recover its original form C. ability to undergo large permanent deformations in tension D. all of the above E.…