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
-
Low carbon steel contains carbon
-
0.3 %
-
0.03%
-
5%
-
None
Ans: (i)
-
Medium carbon steel contains carbon between
-
0.1 to % 0.3 %
-
0.3% to 0.7%
-
0.3 to 0.5 %% and
-
None
Ans: (iii)
-
High carbon steel contains carbon
-
0.5% to 1.0 %and
-
0.5 % t0 0.9%
-
0.5 % to 0.7 %
-
None
Ans: (iii)
-
Tool steel has carbon
-
≥0.5% and ≤ 1.0 %
-
≤0.5 % and ≥ 1% and
-
≥ 7% and ≤2.0 %
-
None
Ans: (iii)
-
Cast iron has carbon
-
<2.0%
-
> 7%
-
> 2.0%
-
None
Ans: (iii)
-
Steels with low alloys has carbon
-
≤1 %
-
≤2 %
-
≥2 %
-
None
Ans: (ii)
-
Carbon in High alloy steels is
-
≤2 %
-
≤1 %
-
≥2 %
-
None
Ans: (iii)
-
Lower critical temperature (A1) in iron carbon diagram is
-
5270C
-
7270C
-
9110C
-
None
Ans: (ii)
-
Curie temperature (A2) in iron carbon diagram is
-
727 0 C
-
7680C
-
9110C
-
None
Ans: (ii)
-
Maximum upper critical temperature in iron carbon diagram is
-
9110C
-
11480C
-
15380C
-
None
Ans: (i)
-
Slowest cooling is obtainable
-
Air
-
Furnace
-
Water
-
None
Ans: (ii)
-
Fastest cooling is obtainable by cooling in
-
Water
-
Air
-
Brine
-
None
Ans: (iii)
-
Hardness of steel increases with the
-
Increase of carbon %
-
Decrease of carbon %
-
By slow cooling
-
None
Ans: (i)
-
Hypo-eutectoid steel contains carbon
-
<0.022 %
-
< 0.770 %
-
< 6.77 %
-
None
Ans: (ii)
-
Hypereutectoid steel contains carbon
-
< 0.770 %
-
< 0.22 %
-
> 0.770
-
None
Ans: (iii)
-
α ferrite iron has the micro-structure as
-
FCC
-
BCC
-
HCP
-
None
Ans: (ii)
-
Which micro-structure γ-Austenite has
-
BCC
-
FCC
-
HCP
-
None
Ans: (ii)
-
δ-Ferrite has which micro-structure
-
HCP
-
FCC
-
BCC
-
None
Ans: (iii)
-
Referring iron carbon diagrams, super-cooling takes place when
-
All Transformations take place at temperatures below the predicted by the phase diagram
-
Such that Transformations take place at temperatures equal to the predicted by the phase diagram
-
Transformations take place at temperatures above the predicted by the phase diagram
-
None
Ans: (i)
-
Super-heating applies to transformations in iron carbon diagrams when
-
Such that transformations take place at temperatures below the predicted by the phase diagram
-
Transformations take place at temperatures equal to the predicted by the phase diagram
-
All Transformations take place at temperatures above the predicted by the phase diagram
-
None
Ans: (iii)
-
TTT diagrams stand for
-
Time, temperature and transformation
-
Temperature, transformation and time
-
Temperature, time and transformation
-
None
Ans: (iii )
-
All TTT diagrams are family of
-
V-shaped curves
-
Z-shaped curves
-
S-shaped curves
-
None
Ans: (iii)
-
At low temperatures, transformations are
-
Slow
-
Fast
-
Neither fast nor slow
-
None
Ans: (i)
-
The growth of grain at low temperatures is
-
Neither fast nor slow
-
Fast
-
Slow
-
None
Ans: (ii)
-
Martensite forms from Austenite on
-
Fast cooling
-
Slow cooling
-
Medium cooling
-
None