11
What do you mean by basicity
A)
It is the ratio of basic oxide to acidic oxide
B)
It is the ratio of acidic oxide to basic oxide
C)
It is the ratio of basic oxide
D)
It is the ratio of acidic oxide
Answer & Solution
Answer: Option
A
12
Necessary condition for removal of sulphur from liquid steel are
A)
high temperature, high Viscosity, high FeO content of slag
B)
high temperature, low viscosity, low FeO content of salg
C)
low temperature, low viscosity, low FeO content of slag
D)
high temperature, high viscosity, low FeO content of slag
Answer & Solution
Answer: Option
B
13
In which year the open-hearth furnace is developed
A)
1879
B)
1865
C)
1953
D)
1856
Answer & Solution
Answer: Option
B
14
Thomas steel making is used when
A)
When P content is more than 1.5%
B)
When P content is less than 0.05%
C)
Both A and B
D)
None of these
Answer & Solution
Answer: Option
A
15
The steel which contains carbon percentage up to 0.35 - 0.65% is called
A)
Mild steel
B)
Low carbon steel
C)
Medium carbon steel
D)
High carbon steel
Answer & Solution
Answer: Option
C
16
Manganese recovery insteelmaking is aided by
A)
P, Q
B)
Q, S
C)
R, T
D)
Q, R
Answer & Solution
Answer: Option
D
17
When quenched in water, the structured produced is austenitic provided manganese to carbon ratio in the given Hadfield steel is
A)
1 : 1
B)
5 : 1
C)
10 : 1
D)
1 : 10
Answer & Solution
Answer: Option
C
18
Stainless steel having a similar carbon content becomes least susceptible to intergranular corrosion if it is
A)
Ferritic
B)
austenitic
C)
martensitic
D)
duplex
Answer & Solution
Answer: Option
D
19
In AOD process of stainless steel making, a mixture of argon and oxygen gas in blown through the bottom because the argon gas
A)
dissolve in steel to offer better corrosion protection
B)
acts as a catalyst for the reaction of carbon and oxygen
C)
lowers the partial pressure of CO gas in the bubble and hence helps to increase the decarburisation rate
D)
Prevents the oxidation of expensive nickel in the stainless steel
Answer & Solution
Answer: Option
D
20
475°C embrittlement phenomenon is observed when stainless steels are heated into the range of
A)
400 - 550°C
B)
500 - 850°C
C)
850 - 950°C
D)
950 - 1050°C
Answer & Solution
Answer: Option
A
