Test: Heat Treatment of Steels - 3 - Mechanical Engineering MCQ

Tempering is a process of annealing

Hardness of steel greatly improves with

Primary objective of full annealing is to

Carburized machine components have high endurance limit because carburization

Tempering temperature of most of the material is of the order of

Case hardening is the only method suitable for hardening

Which of the following materials cannot be heat treated

The machine tool guide ways are hardened by

The Iron-carbon diagram and the TTT curves are determined under

Cast steel crankshaft surface is hardened by

TTT diagram indicates time, temperature and transformation of

When the temperature of a solid metal increases

The main purpose of spheroidising treatment is to improve

The essential constituent of a hardened steel is

Which of the following is defined as the ability of the structure to transform into martensite?

Normalizing of steel is done by

The heat treatment process used for hardening of steel is

Microstructure of annealed hypereutectoid plain carbon steel consists of

Which one of the following cooling methods is best suited for converting Austenite steel into very fine Peariite steel?

Doubling the frequency of current in an induction hardening process

“Matching Exercise”. Choose the correct one out of the alternatives A, B, C, D.
Heat treatment process
P. Annealing
Q. Normalising
R. Martempering sizes
S. Nitriding
Application
1. Surface hardening
2. Relieving stress
3. Refining grain
4. Reducing warping and cracking

Match List-I (Heat Treatment) with List-ll (Effect on the properties) and select the correct answer using the codes given below the lists:
List-I
A. Annealing
B. Nitriding
C. Martempering
D. Normalizing
List-ll
1. Refined grain structure
2. Improves the hardness of the whole mass
3. Increases surface hardness
4. Improves ductility
Codes:
    A B C D
(a) 4 3 2 1
(b) 1 3 4 2
(c) 4 2 1 3
(d) 2 1 3 4

Match List-I (Name of treatment) with List-ll (Media used) and select the correct answer using the codes given below the lists:
List-I
A. Pack carburising
B. Gas carburising
C. Cyaniding
D. Nitriding
List-ll
1. Ammonia gas
2. Sodium cyanide
3. Carburising compound
4. Ethane
Codes:
     A B C D
(a) 3 4 2 1
(b) 2 1 3 4
(c) 3 1 2 4
(d) 2 4 3 1

Match List-I (Temperature) with List-ll (Tempering) and select the correct answer using the codes given below the lists:
List-I
A. Low temperature tempering
B. Medium temperature tempering
C. High temperature tempering
List-ll
1. 150°C to 250°C
2. 250°C to 350°C
3. 350°C to 450°C
4. 500°C to 650°C
Codes:
     A B C
(a) 1 2 3
(b) 1 2 4
(c) 2 3 4
(d) 4 3 1

Which one of the following advantage of cyaniding is incorrect?

Globular form of cementite is the structure of steel is obtained through

Presence of hydrogen in steel causes