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1. |
Heating elements of electrical heaters are made of |
A. | Nichrome |
B. | Tungsten |
C. | Invar |
D. | Nicheloy |
E. | Phosphor bronze |
Answer» A. Nichrome |
2. |
Which of the following element does not impart hardness to steel? |
A. | Copper |
B. | Nickel |
C. | Silicon |
D. | Chromium |
E. | None of the above |
Answer» A. Copper |
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. Ductility |
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. Diamond square-based pyramid |
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. Brittle |
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. High carbon steel |
7. |
In nodular iron, graphite is present in the form of |
A. | Powder |
B. | Flakes |
C. | Needles |
D. | Spheroids |
E. | Prisms |
Answer» D. Spheroids |
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. Age hardening |
9. |
The flux used in brazing is usually |
A. | Common salt |
B. | Lime |
C. | Borax |
D. | Alum |
E. | None of the above |
Answer» C. Borax |
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. Less than that of ferromagnetic materials |
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. 30?C to 60?C above critical temperature |
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. Fine grains |
13. |
Major constituent of phosphor bronze is |
A. | Zinc |
B. | Copper |
C. | Phosphorous |
D. | Aluminium |
E. | Lead |
Answer» B. Copper |
14. |
Which of the following material is used for permanent magnets? |
A. | Duralumin |
B. | Elnivar |
C. | Delta metal |
D. | Invar |
E. | Alnico |
Answer» E. Alnico |
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. Austenite |
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. Hammers |
17. |
Nodular iron has low |
A. | Melting point |
B. | Tensile strength |
C. | Fluidity |
D. | Machinability |
E. | Rapid heating |
Answer» A. Melting point |
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. (A) and (B) above |
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. metre-2 second-1 |
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. Filling the stem with nitrogen under pressure |
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. All of the above |
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 be |
A. | 7A |
B. | 170 A |
C. | 70 A |
D. | 0.7 A |
E. | 0.07 A |
Answer» D. 0.7 A |
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. Any of the above |
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. T 75 W 18 Co 6 Cr 4 V 1 Mo 75 |
25. |
Percentage of iron in pig iron approximately |
A. | 95% |
B. | 80% |
C. | 90% |
D. | 99.90% |
E. | 78% |
Answer» C. 90% |
26. |
Silicon when added to copper increases its |
A. | Brittleness |
B. | Malleability |
C. | Electrical conductivity |
D. | Hardness |
E. | Machinability |
Answer» D. Hardness |
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. flame hardening |
28. |
Which of the following structure is least hard? |
A. | Pearlite |
B. | Presence of cementite |
C. | Martensite |
D. | Sorbite |
E. | Troosite |
Answer» A. Pearlite |
29. |
Highest specific gravity is of |
A. | Titanium |
B. | Copper |
C. | Lead |
D. | Steel |
E. | Brass |
Answer» C. Lead |
30. |
In which process steel is heated below the critical temperature |
A. | Temperting |
B. | Hardening |
C. | Carburizing |
D. | Annealing |
E. | Normalizing |
Answer» A. Temperting |
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. Chromel-constantan |
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. 0.035 percent |
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. Sodium hydroxide |
34. |
The number of atoms per unit cell in BCC is |
A. | 8 |
B. | 9 |
C. | 3 |
D. | 6 |
E. | 4 |
Answer» B. 9 |
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. 0.6 to 0.7 percent |
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. Iron and nickel |
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. Any of the above |
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. Cupola |
39. |
In order to observe the grain size of steel samples under microscope, the magnification should be the order of |
A. | 2 |
B. | 20 |
C. | 1500 |
D. | 100 |
E. | 10 |
Answer» D. 100 |
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. 0.4 tom |
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. reduces machinability |
42. |
Manganese is added to steel primarily to increase |
A. | Malleability |
B. | Ductility |
C. | Fatigue strength |
D. | Endurance limit |
E. | Tensile strength |
Answer» E. Tensile strength |
43. |
Just as strong is opposite of weak likewise elastic is opposite of |
A. | Rigid |
B. | Soft |
C. | Ductile |
D. | Inelastic |
E. | Hard |
Answer» A. Rigid |
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. 1400-1450?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. Tungsten- molybdenum |
46. |
Which of the following is the softest material? |
A. | Corundum |
B. | Fluorite |
C. | Diamond |
D. | Quartz |
E. | Calcite |
Answer» E. Calcite |
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. Gamma iron |
48. |
All of the following are magnetic materials EXCEPT |
A. | Cast iron |
B. | Zinc |
C. | Nickel |
D. | Cobalt |
E. | Iron |
Answer» B. Zinc |
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. Hardness and tensile strength |
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. Ferrous |
51. |
Which of the following metal has face centred cubic structure? |
A. | Tin |
B. | Gold |
C. | Magnesium |
D. | Zinc |
E. | Cadmium |
Answer» B. Gold |
52. |
Which colour of flame represents the highest temperature? |
A. | Dark red |
B. | Pink |
C. | White |
D. | Light yellow |
E. | Bright red |
Answer» C. White |
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. Tin |
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. Fatigue stress |
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. 1600?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 |
E. | Hardening temperature too low |
Answer» A. Internal stresses in the article before heating |
57. |
Which of the following is the hardest? |
A. | Fluorite |
B. | topaz |
C. | Quartz |
D. | Corundum |
E. | Talc |
Answer» D. Corundum |
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. Delta iron |
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. White stain |
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. High carbon steel |
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. Dead mild steel |
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. 18 percent |
63. |
Eutectoid steel has a structure of |
A. | Martensite |
B. | Bainite |
C. | Sorbite |
D. | Nickel |
E. | A combination of all above |
Answer» D. Nickel |
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. Lime stone |
65. |
Galvanising layer usually provides protection in the range of water |
A. | 7 to 14 |
B. | Complete protection is provided |
C. | 1 to 7 |
D. | 1 to 14 |
E. | 6 to 11 |
Answer» E. 6 to 11 |
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. Soft and ductile |
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. Non-uniform heating or cooling |
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. All of the above |
69. |
Which allotropic form of iron is magnetic at room temperature? |
A. | Alpha iron |
B. | Beta iron |
C. | Gamma iron |
D. | Delta iron |
E. | All of the above |
Answer» A. Alpha iron |
70. |
Persence of lead in brass improves |
A. | Malleability |
B. | Hardenability |
C. | Ductility |
D. | Fatigue resistance |
E. | Machining properties |
Answer» E. Machining properties |
71. |
Which of the following is a noble metal? |
A. | Aluminium |
B. | Chromium |
C. | Stainless steel |
D. | Nickel |
E. | Platinum |
Answer» E. Platinum |
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. Malleable iron |
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. White |
74. |
Nickel is |
A. | Ferromagnetic |
B. | Ferroelectric |
C. | Dielectric |
D. | Paramagnetic |
E. | None of the above |
Answer» A. Ferromagnetic |
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. 4000 kg/cm2 |
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. Any of the above |
77. |
Spherical metal powders are usually produced by |
A. | Milling |
B. | Electrolytic process |
C. | Oxidation |
D. | Automization |
E. | Reduction |
Answer» D. Automization |
78. |
In Brinell hardness testing the timer for loading is |
A. | 15 seconds |
B. | 1 second |
C. | 5 seconds |
D. | 1 minute |
E. | 2 seconds |
Answer» A. 15 seconds |
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. Chromium |
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. greater toughness |
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. Hoding the work piece vertically over the quenching bath and plunging it straight |
82. |
Which of the following is not a hardening process? |
A. | Nitriding |
B. | Carburising |
C. | Cyaniding |
D. | Sphcroidizing |
E. | Induction hardening |
Answer» D. Sphcroidizing |
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. 1.70% |
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. Nickel and chromium |
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. 0.21 percent |
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. Bismuth, lead and tin |
87. |
Stellite contains |
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. Cobalt, chromium and tungsten |
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. No core is used |
89. |
Mild steel has the structure of |
A. | BCC |
B. | Cubic |
C. | FCC |
D. | HCC |
E. | Orthorhombic |
Answer» A. BCC |
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. Converter |
91. |
Lowest melting point may be expected for |
A. | Brass |
B. | Lead |
C. | Zirconium |
D. | Copper |
E. | Aluminium |
Answer» B. Lead |
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. Wrought iron |
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. Brown stain |
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. Improve softness and flexibility |
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. Galvanising |
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. Seeback effect |
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. 2 mm |
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. All of the above |
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. It is malleable |
100. |
Which iron ore has least percentage of iron |
A. | Magnetite |
B. | Limonite |
C. | All have almost equal percentage of iron ore |
D. | Siderite |
E. | Hematite |
Answer» D. Siderite |
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