| 1. | In heat treatment process annealing is done to ? | |
|
increase the toughness
|
||
|
increase the softness
|
||
|
increase the hardness
|
||
|
increase the brittleness
|
||
View Answer
Discuss in Forum
Report Question| 2. | To purpose of the hardening process is ? | |
|
to harden the steel to the maximum level
|
||
|
to reduce the carbon on the surface of steel
|
||
|
to induce controlled residual stresses
|
||
|
to re-soften the steel after cold working
|
||
| 3. | Most rapid method of farming metal into desired shape by plastic deformation in between roles is called ? | |
|
drawing
|
||
|
pearcing
|
||
|
extrusion
|
||
|
rolling
|
||
| 4. | As the carbon percentage increase the steel, hardness value ________ ? | |
|
increase
|
||
|
decrease
|
||
|
remains constant
|
||
|
does not depend on carbon percentage
|
||
| 5. | Which of the following method is also now as their quenching ? | |
|
annealing
|
||
|
case hardening
|
||
|
tempering
|
||
|
normalising
|
||
| 6. | For case hardening the first stage is carbonising. By carbonising it is meant .......... ? | |
|
increasing the percentage of carbon of the steel piece
|
||
|
increasing the percentage of carbon of the core of the piece
|
||
|
increasing the percentage of carbon on the surface
|
||
|
decreasing the percentage of carbon of the steel peace
|
||
| 7. | What is the hardening temperature of high speed steel ? | |
|
750°c
|
||
|
850°c
|
||
|
950°c
|
||
|
1250°c
|
||
| 8. | During the heat treatment when carbon is dissolved to form solid solution, it is known as ? | |
|
ferrite
|
||
|
cementite
|
||
|
austenite
|
||
|
martensite
|
||
| 9. | Lower critical temperature of high carbon steel while hardening ? | |
|
970°c
|
||
|
560°c
|
||
|
723°c
|
||
|
660°c
|
||
| 10. | This instrument is used to measure in the high temperature of furnace is ? | |
|
thermometer
|
||
|
pyrometer
|
||
|
hydrometer
|
||
|
barometer
|
||