Quiznetik
Metallurgy | Set 3
1. In grey cast iron, carbon is present in the form of
A. Cementite
B. Flakes
C. Powder
D. Spheroids
E. None of the above
Correct : B. Flakes
2. Which of the following affects the hardenability of steel?
A. Austenitic composition
B. Austenitic grain size
C. Amount, nature and distribution of undissolved or insoluble particles in austenite
D. All of the above
E. Low specific heat of quenching oil
Correct : D. All of the above
3. Electric process for steel making is used in which of the following steel plant?
A. Bhilai
B. Bokaro
C. Durgapur
D. TISCO
E. None of the above
Correct : E. None of the above
4. In a diamagnetic material the effect of an applied magnetic field is that
A. A net dipole moment is induced in the material
B. There is a net reduction in flux density
C. The induced magnetism is in opposition to applied field
D. All of the above
E. None of the above
Correct : D. All of the above
5. In tool steel the percentage of silicon is usually restricted to
A. 1 percent
B. 2 percent
C. 0.5 percent
D. 0.2 percent
E. 5 percent
Correct : D. 0.2 percent
6. The highest rate of quenching is possible in
A. Cold furnace
B. Oil
C. Air
D. Water
E. Hot furnace
Correct : D. Water
7. There are 14 atoms in a unit cell of
A. Body centred cubic space lattice
B. Face centred cubic space lattice
C. Close packed hexagonal space lattice
D. All of the above
E. None of the above
Correct : B. Face centred cubic space lattice
8. Coarse grained steels
A. Are less tough
B. Are less liable to distortion
C. Have poor machinability
D. Have leser depth hardening power
E. None of the above
Correct : A. Are less tough
9. Normal mercury thermometer can be used upto
A. 300?C
B. 500?C
C. 100?C
D. 800?C
E. 212?C
Correct : A. 300?C
10. During heat treatment the formation of thick layer of scale on the surface of steel articles is mainly due to
A. oxidation
B. excessive hardness
C. Low specific heat of quenching oil
D. coarse grain structure
E. reduction
Correct : A. oxidation
11. Ultimate tensile strength is least in case of
A. Cast iron
B. Mild steel
C. Wrought iron
D. High carbon steel
E. Low carbon steel
Correct : A. Cast iron
12. An instrument which is used for measuring temperature variations by change in a metallic resistance is called a
A. thermo-generator
B. Thermo-galvanometer
C. Thennocouple
D. Thermopile
E. Bolometer
Correct : E. Bolometer
13. White metal contains
A. Mercury and zinc
B. Copper, zinc and mercury
C. Lead and copper
D. Lead and bismuth
E. Lead and zinc
Correct : D. Lead and bismuth
14. For acid resistance cast iron should have silicon percentage of
A. 1 percent
B. 15 percent
C. 10 percent
D. 25 percent
E. 2 percent
Correct : B. 15 percent
15. Which of the following gives granular fracture?
A. Steel
B. Wrought iron
C. Cast iron
D. All of the above
E. None of the above
Correct : A. Steel
16. The crystal structure of alpha iron is
A. BCC
B. FCC
C. HCC
D. Cubic
E. None of the above
Correct : A. BCC
17. Which of the following operation on grey cast iron will result in the production of white cast iron?
A. Rapid heating
B. Tumbling
C. Tempering
D. Shot peening
E. Rapid cooling
Correct : A. Rapid heating
18. A solder consists of
A. Tin and antimony
B. Tin and white metal
C. Lead and tin
D. Zinc and lead
E. Zinc and tin
Correct : C. Lead and tin
19. Ferrites are a sub-group of
A. Ferromagnetic materials
B. Ferrimagnetic materials
C. Diamagnetic materials
D. Paramagnetic materials
E. None of the above
Correct : B. Ferrimagnetic materials
20. Which of the following material is added to cast iron to obtain nodular cast iron?
A. Chromium
B. Copper
C. Magnesium
D. Manganese
E. Molybdenum
Correct : C. Magnesium
21. Pure iron has the structure of
A. Ferrite
B. Pearlite and austenite
C. Pearlite
D. Austenite
E. Pearlite, austenite and ferrite
Correct : A. Ferrite
22. A hardness value of 1400 BHN can be expected in case of
A. Cementite
B. Ferrite
C. Pearlite
D. All of the above
E. None of the above
Correct : A. Cementite
23. During first charge in cupola the time taken by material to melt is approximately
A. 2
B. 5 to 6 hours
C. 10 minutes
D. 1 hour
E. Half an hour
Correct : A. 2
24. Chromium percentage in cutlery stainless steel is
A. 11 - 13 percent
B. 18 - 20.5 percent
C. 6 - 8 percent
D. 15 - 18 percent
E. 8 - 10 percent
Correct : E. 8 - 10 percent
25. Percentage of carbon is least in case of
A. Pig iron
B. Wrought iron
C. Malleable iron
D. Cast iron
E. Steel
Correct : B. Wrought iron
26. Slow plastic deformation of metals under a constant stress is known as
A. Endurance failure
B. Proof deformation
C. Creep
D. Gradual deformation
E. Fatigue
Correct : C. Creep
27. The chemical formula of cementite is
A. FeC3
B. Fe2C3
C. FeC
D. Fe3C2
E. Fe3C
Correct : E. Fe3C
28. A steel specimen is heated to 730?C and cooled at the slowest possible rate in the furnace. Which property will be imparted to the steel piece?
A. Low specific heat of quenching oil
B. Tempering
C. Softness
D. Toughness
E. Hardness
Correct : C. Softness
29. Insufficient hardness after tempering may be due to
A. tempering temperature too low
B. tempering temperature too high
C. oxidising atmosphere in the furnace
D. Any of the above
E. Low specific heat of quenching oil
Correct : B. tempering temperature too high
30. Which of the following element has hexagonal close packed structure?
A. Molybdenum
B. Cadmium
C. Chromium
D. Lead
E. Aluminium
Correct : B. Cadmium
31. Brass in an alloy of
A. Copper and lead
B. Copper and tin
C. Copper and nickel
D. Copper and aluminium
E. Copper and zinc
Correct : E. Copper and zinc
32. Which of the following metals has highest specific gravity?
A. Silver
B. Copper
C. Iron
D. Aluminium
E. Brass
Correct : A. Silver
33. Which of the following material is generally not used as deoxidiser for producing killed steel?
A. Copper
B. Ferro-silicon
C. Ferro-manganese
D. Aluminium
E. All of the above
Correct : A. Copper
34. The net magnetic moment is zero is case of
A. Ferromagnetic materials
B. Ferrimagnetic materials
C. Anti-ferromagnetic materials
D. All of the above
E. None of the above
Correct : C. Anti-ferromagnetic materials
35. In Brinell hardness tester the load for aluminium is
A. 1000 kg
B. 500 kg
C. 300 kg
D. 100 kg
E. 1500 kg
Correct : B. 500 kg
36. The nature of atomic bond found in diamond is
A. Ionic
B. Covalent
C. Metallic
D. Either of above
E. None of the above
Correct : B. Covalent
37. Annealing treatment is normally used for
A. Forgings
B. Cold worked sheets
C. Wires
D. Castings
E. All of the above
Correct : E. All of the above
38. During dielectric heating, the heat is generated primarily due to
A. Eddy currents
B. High voltage
C. High flux density
D. High power consumption
E. Stray magnetic fields
Correct : A. Eddy currents
39. For each ton of pig iron produced in a blast furnace, the amount of ore used is approximately.
A. 1 ton
B. 13 tons
C. 5 tons
D. 2 tons
E. 12.5 tons
Correct : D. 2 tons