Metallurgy

1 of 3 sets

1. Heating elements of electrical heaters are made of

A. Nichrome
B. Tungsten
C. Invar
D. Nicheloy
E. Phosphor bronze
Answer:A

2. Which of the following element does not impart hardness to steel?

A. Copper
o m
B. Nickel
. c
C. Silicon
te
D. Chromium a
E. None of the above
q M
Answer:A
c
M
3. The property which enables metals to be drawn into wire is known as
A. Plastic deformation
B. Ductility
C. Malleability
D. Elastic deformation
E. Straining
Answer:B

4. Endentor used in Vickers hardness testing machine is

A. Diamond square-based pyramid
B. 10 mm dia ball
C. 15 mm dia ball
D. 25 mm dia ball
E. Conical indentor with 120? apex angle
Answer:A

5. When steel is made from phosphatic iron, it is likely to be

A. Hard
B. Ductile
C. Brittle
D. Tough
E. Malleable
Answer:C

6. Compressive strength is highest in case of

A. Mild steel
B. Wrought iron
C. High carbon steel
D. Cast iron
E. Low carbon steel
Answer:C

7. In nodular iron, graphite is present in the form of

A. Powder
B. Flakes
C. Needles
D. Spheroids
E. Prisms
Answer:D

8. Which hardening process is generally not used for steels?

A. Age hardening
B. Pack carburising
C. Induction hardening
D. Nitriding
E. Cyanidin
Answer:A

9. The flux used in brazing is usually

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 A. Common salt
B. Lime
C. Borax
D. Alum
E. None of the above
Answer:C

10. The electrical conductivity of ferrites is

A. Very high as compared to that of ferromagnetic materials
B. Greater than that of ferromagnetic materials
C. Equal to that of ferromagnetic materials
D. Very low as compared to that of ferromagnetic materials
E. Less than that of ferromagnetic materials
Answer:E

11. For normalizing, steel is heated to

A. 900?C
B. 30?C to 60?C above critical temperature
C. 700?C
D. 100?C below critical temperature
E. Critical temperature
Answer:B

12. Steel recommended for induction hardening should have

A. Rough surface
B. Fine grains
C. Low electrical and thermal conductivity
D. Coarse grains
E. Low alloy content
Answer:B

13. Major constituent of phosphor bronze is

A. Zinc
B. Copper
C. Phosphorous

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 D. Aluminium
E. Lead
Answer:B

14. Which of the following material is used for permanent magnets?

A. Duralumin
B. Elnivar
C. Delta metal
D. Invar
E. Alnico
Answer:E

15. If the steel at room temperature is magnetic, the presence of which constituent
can be ruled out?
A. Ferrite
B. Pearlite
C. Austenite
D. Cementite
E. None of the above
Answer:C

16. Which of the following is usually made of high carbon steel?

A. Channels
B. Die blocks
C. Hammers
D. Solid drawn tubes
E. Angle iron
Answer:C

17. Nodular iron has low

A. Melting point
B. Tensile strength
C. Fluidity
D. Machinability
E. Rapid heating

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Answer:A

18. In order to improve machinability of stainless steels

A. 0.2 percent selenium is added
B. 0.35 percent sulphur is added
C. 0.5 percent manganese is added
D. (A) and (B) above
E. (B) or (C) above
Answer:D

19. The unit of diffusion coefficient is

A. metre second
B. Presence of cementite
C. metre2 second-1
D. metre second-1
E. metre-2 second-1
Answer:E

20. The upper range of mercury thermometer can be increased by

A. Filling the stem with nitrogen under pressure
B. Increasing tube diameter
C. Taking into account expansion of tube
D. Range cannot be increased
E. Providing steel tube
Answer:A

21. The depth of hardening is affected by

A. Size of specimen
B. Hardenability of steel
C. Quenching medium
D. All of the above
E. Low specific heat of quenching oil
Answer:D

22. Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? )

give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will

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be
A. 7A
B. 170 A
C. 70 A
D. 0.7 A
E. 0.07 A
Answer:D

23. During hardening soft spots can be avoided by

A. using a more effective cooling medium
B. protecting against decarburization in heating
C. obtaining a more homogeneous structure employing annealing or normalising before
hardening
D. Any of the above
E. Low specific heat of quenching oil
Answer:D

24. Which of the following is high speed steel?

A. T 55 Ni Cr 65 Mo 30
B. T 75 W 18 Co 6 Cr 4
C. T 10 Cr 5 Mo 75 V 23
D. T 75 W 18 Co 6 Cr 4 V 1 Mo 75
E. None of the above
Answer:D

25. Percentage of iron in pig iron approximately

A. 95%
B. 80%
C. 90%
D. 99.90%
E. 78%
Answer:C

26. Silicon when added to copper increases its

A. Brittleness

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 B. Malleability
C. Electrical conductivity
D. Hardness
E. Machinability
Answer:D

27. Local hardening of steel can be done by all of the following EXCEPT
A. flame hardening
B. stepped uniform heating
C. resistance heating
D. Low specific heat of quenching oil
E. induction hardening
Answer:A

28. Which of the following structure is least hard?

A. Pearlite
B. Presence of cementite
C. Martensite
D. Sorbite
E. Troosite
Answer:A

29. Highest specific gravity is of

A. Titanium
B. Copper
C. Lead
D. Steel
E. Brass
Answer:C

30. In which process steel is heated below the critical temperature

A. Temperting
B. Hardening
C. Carburizing
D. Annealing

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 E. Normalizing
Answer:A

31. Under identical values of cold and hot junction temperatures which
thermocouple given the highest output
A. Iron constantan
B. All give equal output
C. Nickel nimo
D. Chromel-constantan
E. Platinum-platinum-rhodium
Answer:D

32. In tool steel the sulphur content is usually not allowed to exceed
A. 3.5 percent
B. 0.035 percent
C. 5 percent
D. 0.001 percent
E. 0.35 percent
Answer:B

33. Which of the following material is not used for cyaniding?

A. Sodium carbonate
B. Sodium chloride
C. Sodium hydroxide
D. Sodium cyanide
E. All of the above
Answer:C

34. The number of atoms per unit cell in BCC is

A. 8
B. 9
C. 3
D. 6
E. 4
Answer:B

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35. As per IS code, C 65 steel will have carbon percentage of
A. 0.065 percent
B. 0.6 to 0.7 percent
C. 6 to 7 percent
D. 00 to 70 percent
E. None of the above
Answer:B

36. Invar is an alloy of

A. Iron and copper
B. Iron and nickel
C. Iron and chromium
D. Iron and zinc
E. Iron and vanadium
Answer:B

37. Which of the following can be used as fuel in open hearth furnace?
A. Liquid fuels
B. Coke oven gas
C. Producer gas
D. Any of the above
E. Low specific heat of quenching oil
Answer:D

38. Which of the following furnaces is not used for non-ferrous materials
A. Gas fired tilting furnace
B. Pit furnace
C. Cupola
D. Crucible furnace
E. Oil fired tilting furnace
Answer:C

39. In order to observe the grain size of steel samples under microscope, the
magnification should be the order of
A. 2
B. 20

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 C. 1500
D. 100
E. 10
Answer:D

40. For each ton of pig iron produced from blast furnace, the lime stone used is
approximately
A. 0.01 ton
B. 0.4 tom
C. 0.1 ton
D. 1.4 ton
E. 2.55 tons
Answer:B

41. Chilling, heat treatment and alloy addition to cast iron generally
A. reduces machinability
B. reduces carbon percentage
C. reduces wear resistance
D. improves machinability
E. None of the above
Answer:A

42. Manganese is added to steel primarily to increase

A. Malleability
B. Ductility
C. Fatigue strength
D. Endurance limit
E. Tensile strength
Answer:E

43. Just as strong is opposite of weak likewise elastic is opposite of

A. Rigid
B. Soft
C. Ductile
D. Inelastic

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 E. Hard
Answer:A

44. Which of the following temperatures represents the tempering temperature for
C 30 steel?
A. 1700?C
B. 100-150?C
C. 1400-1450?C
D. 550-660?C
E. 860-890?C
Answer:C

45. Which thermocouple can measure the highest temperature?

A. Tungsten- molybdenum
B. Copper-constantan
C. Chromel-alumel
D. Iron constantan
E. Platinum-rhodium
Answer:A

46. Which of the following is the softest material?

A. Corundum
B. Fluorite
C. Diamond
D. Quartz
E. Calcite
Answer:E

47. Which allotropic form of iron does not have body centred cubic lattice?
A. Alpha iron
B. Beta iron
C. Gamma iron
D. Delta iron
E. All of the above
Answer:C

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48. All of the following are magnetic materials EXCEPT
A. Cast iron
B. Zinc
C. Nickel
D. Cobalt
E. Iron
Answer:B

49. Machinability of metal depends on

A. Hardness
B. Hardness and tensile strength
C. Brittleness
D. Brittleness and toughness
E. None of the above
Answer:B

50. Which of the following is not a constituent of Stellite?

A. Cobalt
B. Tungsten
C. Ferrous
D. Chromium
E. All of the above
Answer:C

51. Which of the following metal has face centred cubic structure?
A. Tin
B. Gold
C. Magnesium
D. Zinc
E. Cadmium
Answer:B

52. Which colour of flame represents the highest temperature?

A. Dark red
B. Pink

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 C. White
D. Light yellow
E. Bright red
Answer:C

53. Which of the following metal does not have face centred cubic structure?
A. Nickel
B. Tin
C. Lead
D. Copper
E. Silver
Answer:B

54. The rollers of a cycle chain are subjected to

A. Shear stress
B. Tensile stress
C. Creep stress
D. Fatigue stress
E. Compressive stress
Answer:D

55. The maximum temperature inside a blast furnace gas is of the order of
A. 2600?C
B. 1000?C
C. 1600?C
D. 50?C
E. 3600?C
Answer:C

56. If an article develops insufficient hardening after quenching it could be due to

any of the following EXCEPT
A. Internal stresses in the article before heating
B. Low specific heat of quenching oil
C. Cooling rate too slow
D. Holding insufficient at the hardening temperature

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 E. Hardening temperature too low
Answer:A

57. Which of the following is the hardest?

A. Fluorite
B. topaz
C. Quartz
D. Corundum
E. Talc
Answer:D

58. The allotropic form of iron not having body centred cubic lattice is
A. Alpha iron
B. Beta iron
C. Gamma iron
D. Delta iron
E. All of the above
Answer:D

59. Dilute nitric acid applied to a clean fracture of wrought iron gives
A. Grey stain
B. Greenish stain
C. White stain
D. Blue stain
E. Black stain
Answer:C

60. Railway rails are made of

A. Mild steel
B. Low carbon steel
C. Medium carbon steel
D. Dead muld steel
E. High carbon steel
Answer:E

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61. High ductility wires are made on
A. Wrought iron
B. Medium carbon steel
C. Cast iron
D. Dead mild steel
E. High carbon steel
Answer:D

62. The highest percentage of chrommium that can be added to steel is usually
A. 18 percent
B. 25 percent
C. 15 percent
D. 50 percent
E. 12 percent
Answer:A

63. Eutectoid steel has a structure of

A. Martensite
B. Bainite
C. Sorbite
D. Nickel
E. A combination of all above
Answer:D

64. The flux used in blast furnace while melting iron ore is
A. Bauxite
B. Carbon
C. Oxygen
D. Sodium chloride
E. Lime stone
Answer:E

65. Galvanising layer usually provides protection in the range of water

A. 7 to 14
B. Complete protection is provided

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 C. 1 to 7
D. 1 to 14
E. 6 to 11
Answer:E

66. Ferrite is
A. Low specific heat of quenching oil
B. Present in abundance in high carbon steel
C. Soft and ductile
D. Hardenable under rapid cooling
E. Amorphous and brittle
Answer:C

67. If a sample of steel shows unsymmetrical deformation of a piece in quenching,

the probable cause could be
A. Impure quenching oil
B. Low specific heat of quenching oil
C. Excessive proportion of alloying elements
D. Non-uniform heating or cooling
E. Low temperature during heating
Answer:D

68. Attack of steel is increased by

A. Salt solution below a paint coat
B. Invisible moisture film present prior to painting
C. Graphite in the priming coat
D. Loose rust and partially removed mill scale
E. All of the above
Answer:E

69. Which allotropic form of iron is magnetic at room temperature?

A. Alpha iron
B. Beta iron
C. Gamma iron
D. Delta iron

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 E. All of the above
Answer:A

70. Persence of lead in brass improves

A. Malleability
B. Hardenability
C. Ductility
D. Fatigue resistance
E. Machining properties
Answer:E

71. Which of the following is a noble metal?

A. Aluminium
B. Chromium
C. Stainless steel
D. Nickel
E. Platinum
Answer:E

72. Which of the following form of iron is produced as a result of annealing of

white cast iron?
A. Wrought iron
B. Spheroidal iron
C. Nodular iron
D. Malleable iron
E. Grey iron
Answer:D

73. Which colour of heat represents the highest temperature?

A. Low specific heat of quenching oil
B. White
C. Salmon
D. Dry cherry
E. Blood red
Answer:B

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74. Nickel is
A. Ferromagnetic
B. Ferroelectric
C. Dielectric
D. Paramagnetic
E. None of the above
Answer:A

75. The tensile strength of nodular iron may be of the order of

A. 500 kg/cm2
B. 100 kg/cm2
C. 1000 kg/cm2
D. 2000 kg/cm2
E. 4000 kg/cm2
Answer:E

76. During heat treatment, deformation and volume changes can be minimised by
A. slowly cooling in the martensitic range
B. using surface hardening when possible
C. using alloy steels least prone to such changes
D. Any of the above
E. Low specific heat of quenching oil
Answer:D

77. Spherical metal powders are usually produced by

A. Milling
B. Electrolytic process
C. Oxidation
D. Automization
E. Reduction
Answer:D

78. In Brinell hardness testing the timer for loading is

A. 15 seconds
B. 1 second

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 C. 5 seconds
D. 1 minute
E. 2 seconds
Answer:A

79. The stainless steels owe their resistance to corrosion to the presence of
A. Chromium
B. Carbon
C. Sulphur
D. Manganese
E. Nickel
Answer:A

80. The effect of austenitic grain size development during heat treatment is
A. lower hardenability
B. greater toughness
C. lower internal stress
D. All of the above
E. Low specific heat of quenching oil
Answer:B

81. Warping may be avoided when quenching a long slender piece of work by
A. Holding the work piece between clamps and pouring water on it
B. Hoding the work piece vertically over the quenching bath and plunging it straight
C. Pulling the piece from both ends
D. Holding the piece horizontally in adequate supports
E. None of the above
Answer:B

82. Which of the following is not a hardening process?

A. Nitriding
B. Carburising
C. Cyaniding
D. Sphcroidizing
E. Induction hardening

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Answer:D

83. The maximum percentage of carbon in austenite is

A. 2%
B. 2.70%
C. 1.70%
D. 0.07%
E. 0.70%
Answer:C

84. Nichrome contains

A. Nickel, lead and zinc
B. Nickel and copper
C. Nickel and chromium
D. Nickel, copper and vanadium
E. Nickel, chromium and vanadium
Answer:C

85. Free cutting steels usually have sulphur content of

A. 0.02 percent
B. 0.21 percent
C. 2 percent
D. 10 percent
E. 0.002 percent
Answer:B

86. Fusible plug for boilers consists of

A. Zinc, bismuth and tin
B. Lead, tin and mercury
C. Copper, lead and tin
D. Bismuth, lead and tin
E. Zinc, copper and lead
Answer:D

87. Stellite contains

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 A. Nickel, zinc and aluminium
B. Nickel, copper and zinc
C. Cobalt, chromium and tungsten
D. Copper, tin and lead
E. Cobalt, vanadium and nickel
Answer:C

88. For producing cast iron pipes by centrifugal casting method the core used is
A. Wax core
B. Clay core
C. Metallic core
D. Sand core
E. No core is used
Answer:E

89. Mild steel has the structure of

A. BCC
B. Cubic
C. FCC
D. HCC
E. Orthorhombic
Answer:A

90. Which of the following furnace is used to convert liquid pig iron into steel?
A. Open hearth furnace
B. Cupola
C. Converter
D. Induction arc furnace
E. Low specific heat of quenching oil
Answer:C

91. Lowest melting point may be expected for

A. Brass
B. Lead
C. Zirconium

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 D. Copper
E. Aluminium
Answer:B

92. Which of the following is easiest to bend?

A. Grey pig iron
B. Wrought iron
C. Mottled pig iron
D. Cast iron
E. Steel
Answer:B

93. Dilute nitric acid applied to a clean fracture of white cast iron will produce
A. Grey stain
B. Black stain
C. Pink stain
D. White stain
E. Brown stain
Answer:E

94. Plasticisers are added to plastic compounds to

A. Improve resistance to acids
B. Provide a protective layer
C. Improve resistance to alkalies
D. Increase tensile strength
E. Improve softness and flexibility
Answer:E

95. The process of providing zinc coating on steel pipes is known as

A. Cold working
B. Pickling
C. Galvanising
D. Blistering
E. Spheroidising
Answer:C

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96. Th phenomenon of emf development between two diferent metals placed in
contact is known as
A. Kelvin effect
B. Thomson effect
C. Seeback effect
D. Peltier effect
E. Thermocouple effect
Answer:C

97. Hardening by carburizing is limited to

A. 2 mm
B. 5 mm
C. 0.05 mm
D. Low specific heat of quenching oil
E. 0.1 mm
Answer:A

98. Which of the following is by product from blast furnace?

A. Slag
B. Flue dust
C. Blast furnace gas
D. All of the above
E. None of the above
Answer:D

99. Which of the following is not true in case of white cast iron
A. It is strong
B. It is brittle
C. It is malleable
D. It is whitish in colour
E. It is hard
Answer:C

100. Which iron ore has least percentage of iron

A. Magnetite
B. Limonite

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 C. All have almost equal percentage of iron ore
D. Siderite
E. Hematite
Answer:D

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