Month: January 2019

A. the points where no further change oc-curs
B. constant for all metals
C. the points where there is no further flow of metal
D. the points of discontinuity
E. the points where major changes take place

A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal

A. molecular change
B. physical change
C. allotropic change
D. solidus change
E. atomic change

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