| 1. | Carbon dissolved in iron to form a solid solution is called _________ ? | |
|
austenite
|
||
|
ferrite
|
||
|
cementite
|
||
|
pearlite
|
||
View Answer
Discuss in Forum
Report Question| 2. | At room temperature, plain carbon steel contains ? | |
|
ferrite and cementite
|
||
|
ferrite and pearlite
|
||
|
pearlite and cementite
|
||
|
ferrite, cementite and pearlite
|
||
| 3. | Which one of the following purpose of tempering a hardened steel component ? | |
|
to increase toughness
|
||
|
to increase ductility
|
||
|
to increase hardness
|
||
|
to decrease hardness
|
||
| 4. | Which one of the following structure of steel is obtained due to the drastic cooling from the austenite structure ? | |
|
ferrite
|
||
|
cementite
|
||
|
austenite
|
||
|
martensite
|
||
| 5. | Which one of the following group of quenching diameter is in order of there severity of the cooling rate, i.e. from slow to rapid cooling ? | |
|
oil, forced air, brine solution
|
||
|
oil, brine solution, forced air
|
||
|
forced air, oil, brine solution
|
||
|
brine solution, oil, forced air
|
||
| 6. | In a case hardening process, ammonia gas is introduced on steel, the process is know as ? | |
|
cyaniding
|
||
|
nitriding
|
||
|
ammonising
|
||
|
carburizing
|
||
| 7. | A carbon steel peace heated just above 730°c, maintained at that temperature for a few hours and then slowly cooled, what heat treatment process is carried out ? | |
|
hardening
|
||
|
tempering
|
||
|
normalising
|
||
|
annealing
|
||
| 8. | The purpose of normalising steel is to ? | |
|
remove induced stresses
|
||
|
improve machinability
|
||
|
soften the steel
|
||
|
increase the toughness and decrease the brittleness
|
||
| 9. | Hypo eutectoid steel is one which consists ____________ ? | |
|
carbon up to 0.8%
|
||
|
carbon having just 0.8%
|
||
|
carbon containing more than 0.8% and up to 2.1%
|
||
|
none of the above
|
||
| 10. | Carbonising is used to increase ? | |
|
fatigue strength
|
||
|
were resistance
|
||
|
surface hardness
|
||
|
all of these
|
||