

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
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 |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.