The percentage of carbon in low carbon steel is__________________?
The percentage of carbon in low carbon steel is__________________?
A. 0.05%
B. 0.15%
C. 0.3%
D. 0.5%
E. 0.7%.
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The transistor is made of___________________?
The transistor is made of___________________?A. silver
B. gold
C. copper
D. germanium
E. german silverA steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as
Question: A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as
[A].normalising [B].
annealing [C].
austempering [D].
martempering Answer: Option C
Explanation:
No answer description available for this question.
A material is known as allotropic or polymorphic if it __________________?
A material is known as allotropic or polymorphic if it __________________?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 aboveFor the allotropic forms of iron, the points of arrest are __________________?
For the allotropic forms of iron, the points of arrest are __________________?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 placeIn low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.
Question: In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.
[A].sulphur [B].
phosphorus [C].
manganese [D].
silicon Answer: Option B
Explanation:
No answer description available for this question.
Hardness of martensite is about___________________?
Hardness of martensite is about___________________?A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32