Heat Treatment MCQ - Machinist(Set-1) with Answers

Heat Treatment MCQ - Machinist(Set-1) with Answers

6) The toughness in a steel is increased and brittleness is decreased by a heat treatment operation called as

Answer is:

Tempering

7) In a case hardening process, ammonia gas is produced on steel; the process is known as

Answer is:

Nitriding

8) 'Cyaniding' and 'Nitriding' are two methods of

Answer is:

Case Hardening

Explanation:

List of case hardening or surface hardening methods are
Carburising
Cyaniding
Nitriding
Induction hardening
Flame hardening

'Cyaniding' and 'Nitriding' are two methods of

9) After heating up to required hardening temperature, why must tool steels be quenched ?

Answer is:

To build up hardening structure

Explanation:

After heating up to required hardening temperature, tool steels be quenched to build up hardening structure.

10) A punch is made out of alloyed steel. After hardening it, a crack takes place. What can be the reason to develop this crack ?

Answer is:

The punch is heated too little