Revise fast: tempering, annealing, critical temperatures, soaking and quenching media — with answers & short explanations.
Quick Notes
Use these as last-minute revision points before you attempt the MCQs.
Tempering
Removes extreme brittleness after hardening and improves toughness.
Annealing
Relieves strain and stress, improves machinability and softens steel.
Critical temp
For plain carbon steels, lower critical temperature is 723°C.
Soaking
Holding at temp so heat becomes uniform throughout the section.
Quenching media
Process stages
1) Heating
Raise to required temperature.
2) Soaking
Hold for uniform heating.
3) Quenching
Rapid cooling in medium.
MCQs
Tap “Show answer” to check instantly.
1) Tempering aims to achieve:
2) Purpose of annealing:
3) Lower critical temperature for all plain carbon steels:
4) Upper critical temperature where steel fully changes to austenite:
5) For 0.84% carbon steel, both LCT and UCT are:
6) How many stages are involved in heat treatment process?
7) Purpose of soaking during heat treatment:
8) Quenching medium with the slowest cooling rate:
9) Brine solution is preferred because:
10) Common quenching medium for plain carbon steels:
Need a structured plan?
Daily practice + weekly tests + mentor feedback — built for engineering graduates.
