HEAT TREATMENT MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

 

HEAT TREATMENT MULTIPLE

CHOICE QUESTIONS

(MCQ) WITH ANSWERS 

MCQ increases the understanding and

clarity about heat treatment. More MCQ as

well as other questions on heat treatment

will be further useful.

Sr. No.
Heat Treatment Process
1.
Annealing
(i) Stress Relieving
(ii)Spherodising
(iii)Homogenizing
(iv) Grain control size
2.
Normalizing
3.
Tempering
4.
Isothermal Transformations

 

Sr. No.
Material
% allowing elements
1.
Low carbon steel
< 0.3 %
2.
Medium carbon steel
> 0.3 <0.5 %
3.
High carbon steel
>0.5 < 0.8 %
4.
Low alloy steels
< 2 %
5.
High alloy steels
> 2 %

Fig. Heat Treatment Processes

Fig. Temperature Range for Heat Treatment Processes

 

  1.  Low carbon steel contains carbon

  1. 0.3 %

  2. 0.03%

  3. 5%

  4. None

Ans: (i)

  1.  Medium carbon steel contains carbon between

  1. 0.1 to % 0.3 %

  2. 0.3% to 0.7%

  3. 0.3 to 0.5 %% and

  4. None

Ans: (iii)

  1.  High carbon steel contains carbon

  1. 0.5% to 1.0 %and

  2. 0.5 % t0 0.9%

  3. 0.5 % to 0.7 %

  4. None

Ans: (iii)

  1.  Tool steel has carbon

  1. 0.5% and  1.0 %

  2.  ≤0.5 %  and 1% and 

  3. 7% and ≤2.0 %

  4. None

Ans: (iii)

  1.  Cast iron has carbon

  1. <2.0%

  2. > 7%

  3. > 2.0%

  4. None

Ans: (iii)

  1.  Steels with low alloys has carbon

  1. ≤1 %

  2. ≤2 %

  3. ≥2 %

  4. None

Ans: (ii)

  1.  Carbon in High alloy steels is

  1. ≤2 %

  2. ≤1 %

  3. ≥2 %

  4. None

Ans: (iii)

  1. Lower critical temperature (A1) in iron carbon diagram is

  1. 5270C

  2. 7270C

  3. 9110C

  4. None

Ans: (ii)

  1. Curie temperature (A2) in iron carbon diagram is

  1. 727 C

  2. 7680C

  3. 9110C

  4. None

Ans: (ii)

  1. Maximum upper critical temperature in iron carbon diagram is

  1. 9110C

  2. 11480C

  3. 15380C

  4. None

Ans: (i)

  1. Slowest cooling is obtainable

  1. Air

  2. Furnace

  3. Water

  4. None

Ans: (ii)

  1. Fastest cooling is obtainable by cooling in

  1. Water

  2. Air

  3. Brine

  4. None

Ans: (iii)

  1. Hardness of steel increases with the

  1. Increase of carbon %

  2. Decrease of carbon %

  3. By slow cooling

  4. None

Ans: (i)

  1.  Hypo-eutectoid steel contains carbon

  1. <0.022 %

  2. < 0.770 %

  3. < 6.77 %

  4. None

Ans: (ii)

  1.  Hypereutectoid steel contains carbon

  1. < 0.770 %

  2. < 0.22 %

  3. > 0.770

  4. None

Ans: (iii)

  1.  α ferrite iron has the micro-structure as

  1. FCC

  2. BCC

  3. HCP

  4. None

Ans: (ii)

  1. Which micro-structure γ-Austenite has

  1. BCC

  2. FCC

  3. HCP

  4. None

Ans: (ii)

  1.  δ-Ferrite has which micro-structure

  1. HCP

  2. FCC

  3. BCC

  4. None

Ans: (iii)

  1. Referring iron carbon diagrams, super-cooling takes place when

  1. All Transformations take place at temperatures below the predicted by the phase diagram

  2. Such  that Transformations take place at temperatures equal to the predicted by the phase diagram

  3. Transformations take place at temperatures above the predicted by the phase diagram

  4. None

Ans: (i)

  1. Super-heating applies to transformations in iron carbon diagrams when

  1. Such that transformations take place at temperatures below the predicted by the phase diagram

  2. Transformations take place at temperatures equal to the predicted by the phase diagram

  3. All Transformations take place at temperatures above the predicted by the phase diagram

  4. None

Ans: (iii)

  1. TTT diagrams stand for

  1. Time, temperature and transformation

  2. Temperature, transformation and time

  3. Temperature, time and transformation

  4. None

Ans: (iii )

  1. All TTT diagrams are family of

  1. V-shaped curves

  2. Z-shaped curves

  3. S-shaped curves

  4. None

Ans: (iii)

  1. At low temperatures, transformations are

  1. Slow

  2. Fast

  3. Neither fast nor slow

  4. None

Ans: (i)

  1. The growth of grain at low temperatures is

  1. Neither fast nor slow

  2. Fast

  3. Slow

  4. None

Ans: (ii)

  1. Martensite forms from Austenite on

  1. Fast cooling

  2. Slow cooling

  3. Medium cooling

  4. None

Ans: (i)