Steel Making

20 Questions | By Manojkumarvelama | Last updated: Mar 21, 2022 | Total Attempts: 1927

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Refer to the material provided and answer the questions. This quiz has to be answered before 23:59 hrs of 21st May. Each correct answer will fetch you three points. There is negative marking of one point for each wrong answer

Questions and Answers

1.

Carbon is a major impurity in Blast Furnace metal. Explain how blowing air through the molten metal helps to remove the carbon.
2.

Between the ladle and the water cooled mould is a tundish. This acts as a kind of reservoir for the molten metal. Why do you think this casting reservoir of liquid metal is held in the tundish?
3.

Replacing ingot casting by continuous casting of steel has: (a) reduced energy consumption (b) increased productivity in the steel industry. Explain why continuous casting has benefited the industry in these ways.
4.

In the BOF(Basic Oxygen Furnace) process pure ______ at supersonic speed is blown vertically through a lance onto the surface of hot molten metal contained in a cylindrical-shaped converter.
- A.
  
  Oxygen
- B.
  
  Hydrogen
- C.
  
  Neon
- D.
  
  Carbon dioxide
5.

An important advantage of Bottom Blowing processes is that they operate ____________
- A.
  
  At the equilibrium
- B.
  
  Closer to equilibrium
- C.
  
  Farther from the equilibrium
6.

Blowing of Oxygen under vacuum is the technique used to produce ______________
- A.
  
  High Carbon steels
- B.
  
  Low Carbon steels
- C.
  
  Medium Carbon steels
- D.
  
  ULC steels
7.

The reactions involving the oxidation of metalloids are highly endothermic.
- A.
  
  True
- B.
  
  False
8.

The exit gas generated during blowing is rich in ____________
- A.
  
  Oxygen
- B.
  
  CO
- C.
  
  CO₂
- D.
  
  SO₂
9.

The converter contents often overflow through the tap hole or get ejected through the mouth opening and this is referred to as spitting (for metal droplets) or slopping (for slag-metal emulsion).
- A.
  
  True
- B.
  
  False
10.

The Basic Oxygen Steelmaking (BOS) process takes this liquid iron plus recycled scrap steel, and reduces the carbon content to ___________ by blowing oxygen through the metal in a"converter".
- A.
  
  0 to 2 percent
- B.
  
  0 to 1.5 percent
- C.
  
  1.5 to 2.5 percent
- D.
  
  1 to 1.5 percent
11.

Steel making process occurs at approximately ______________
- A.
  
  1500 degrees Celsius
- B.
  
  1600 degrees Celsius
- C.
  
  1700 degrees Celsius
- D.
  
  1800 degrees Celsius
12.

Which of these is a raw material in steel making?
- A.
  
  Iron Ore
- B.
  
  Coke
- C.
  
  Limestone
- D.
  
  All of these
13.

Bismuth is injected in deep cutting steels to improve machinability.
- A.
  
  True
- B.
  
  False
14.

In a steel alloyed with aluminium(Al 'killed'), if the ladle top slag is ______ (high levels of FeO and MnO), then aluminium in the steel can react with 'oxygen' in the slag to form hard alumina inclusions in the steel which are detrimental to product properties.
- A.
  
  Highly oxidized
- B.
  
  Highly reduced
15.

During steel casting, the steelmaking ladle is emptied through a valve in the bottom of the ladle; as the ladle gradually empties, the ladle top slag coats and solidifies on the side walls of the ladle, and remains there once the ladle is empty. This is termed as ___________
- A.
  
  Rolling
- B.
  
  Steel making
- C.
  
  Steel glazing
- D.
  
  Steel brazing
16.

In ladle stirring, Stokes' law to estimate the float rate, u of a particle. This law is applicable only for __________
- A.
  
  Cuboidal particle
- B.
  
  Spherical particle
- C.
  
  Pyramidal particle
- D.
  
  Any particle
17.

Vacuum treatment (generally called vacuum degassing) is a commonly used steelmaking process, used for removing ____________ from the steel.
- A.
  
  All impurities
- B.
  
  Dissolved gases
- C.
  
  Sulphur
- D.
  
  Phosphorus
18.

Flow from the tundish to the mould is uncontrolled.
- A.
  
  True
- B.
  
  False
19.

Direct strip casting minimises the need for substantial secondary processing.
- A.
  
  True
- B.
  
  False