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 | |
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