Engineering Materials

A. below 723°C
B. 770 – 910°C
C. 910-1440°C
D. 1400-1539°C
E. above 1539°C

A. 770°C
B. 910°C
C. 1050°C
D. below recrystallisation temperature
E. above recrystallization temperature

A. austenite
B. pearlite
C. ferrite
D. cementlte
E. bainite

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

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. there is nothing like points of arrest
E. none of the above

A. increase
B. decrease
C. remain same
D. first increase and then decrease
E. show unpredictable behaviour

A. creep
B. hot tempering
C. hot hardness
D. fatigue
E. superhardening

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

A. in which parts are not loaded
B. in which stress remains constant on in-creasing load
C. in which deformation tends to loosen the joint and produces a stress reduced
D. stress reduces on increasing load
E. none of the above

A. low carbon steel
B. medium carbon steel
C. high carbon steel
D. alloy steel
E. special steel