41
Manganese recovery in steel making is aided by
A)
low slag basicity
B)
low silicon content in hot metal
C)
high slag basicity and high silicon content in the hot metal
D)
none of these
Answer & Solution
Answer: Option
C
42
Most popular grades among all high-speed steels is designated as
A)
18-4-1
B)
18-6-1
C)
18-2-1
D)
18-8-1
Answer & Solution
Answer: Option
A
43
Which of the following is the consequence of hydrogen embrittlement?
A)
Blistering
B)
Pitting
C)
Catastrophic failure
D)
Progressive loss of metal from the surface
Answer & Solution
Answer: Option
A
44
In the acid Bessemer process, the hot metal should have the following composition:
A)
S < 0.05% and P < 0.05%
B)
S < 0.05% and P < 1.5%
C)
S < 0.05% and P > 1. 5%
D)
S > 1.5% and P < 0.05%
Answer & Solution
Answer: Option
A
45
During deoxidation of steel, the sequence of addition of elements should be as follows:
A)
Si, Mn, Al
B)
AI, Mn, Si
C)
Mn, Si, Al
D)
Al, Si, Mn
Answer & Solution
Answer: Option
C
46
Heat resistance steels possess
A)
High temperature strength
B)
Good resistance to oxidation or scaling
C)
Both A and B
D)
None of these
Answer & Solution
Answer: Option
C
A)
increases hardness
B)
decreases toughness
C)
increases strength
D)
all of these
Answer & Solution
Answer: Option
D
48
Ferritic stainless steels are
A)
magnetic
B)
non magnetic
C)
both A and B
D)
none of these
Answer & Solution
Answer: Option
A
49
Match the practices in
Group 1 with the reactors in
Group 2 .
Group 1 Group 2
P. Layered charging of coke and ore
1. Ladle furnace
Q. Oxygen injection through supersonic nozzle
2. Electric are furnace
R. Aluminium wire feeding
3. Blast furnace
S. Foamy slag practice
4. L.D. converter
A)
P-3, Q-1, R-2, S-4
B)
P-2, Q-4, R-3, S-1
C)
P-4, Q-3, R-2, S-1
D)
P-3, Q-4, R-1, S-2
Answer & Solution
Answer: Option
D
50
Hot work tool steels can be classified by
A)
Chromium base, tungsten base & molybdenum base tool steels
B)
Nickel base, tungsten base & molybdenum base tool steels
C)
Chromium base, cobalt base & molybdenum base tool steels
D)
Chromium base, tungsten base & zinc base tool steels
Answer & Solution
Answer: Option
A
