MCQOPTIONS
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MCQOPTIONS
This section includes 176 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The crystal structure of brass is_________________? |
| A. | F.C.C. |
| B. | B.C.C. |
| C. | H.C.P. |
| D. | Orthorhombic crystalline structure |
| E. | none of the above |
| Answer» B. B.C.C. | |
| 52. |
The crystal of alpha iron is ____________________? |
| A. | body centred cubic |
| B. | face centred cubic |
| C. | hexagonal close packed |
| D. | cubic structure |
| E. | orthorhombic crystal |
| Answer» B. face centred cubic | |
| 53. |
The correct sequence for descending order of machinability is _____________________? |
| A. | grey cast iron, low carbon steel, wrought iron |
| B. | low carbon steel, grey cast iron, wrought iron |
| C. | wrought iron,low carbon steel, grey cast iron |
| D. | wrought iron, grey cast iron, low carbon steel |
| E. | grey cast iron, wrought iron, low carbon steel |
| Answer» B. low carbon steel, grey cast iron, wrought iron | |
| 54. |
The correct composition of Babbit metal is__________________? |
| A. | 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi |
| B. | 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg |
| C. | 87% Sn, 4% Cu, 8% Sb, 1% Al |
| D. | 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg |
| E. | none of the above |
| Answer» B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg | |
| 55. |
The composition of silver solder is ___________________? |
| A. | silver, copper, zinc |
| B. | silver, tin, nickel |
| C. | silver, lead, zinc |
| D. | silver, copper, aluminium |
| E. | silver, lead, tin |
| Answer» B. silver, tin, nickel | |
| 56. |
The basic constituents of Hastelloy are_________________? |
| A. | aluminium, copper etc |
| B. | nickel, molybdenum etc |
| C. | nickel, copper, etc |
| D. | all of the above |
| E. | none of the above |
| Answer» C. nickel, copper, etc | |
| 57. |
The alloy used for making electrical resistances and heating elements is____________________? |
| A. | nichrome |
| B. | invar |
| C. | magnin |
| D. | elinvar |
| E. | peiminvar |
| Answer» B. invar | |
| 58. |
Recrystallization temperature is one________________? |
| A. | at which crystals first start forming from molten metal when it is cooled |
| B. | at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated |
| C. | at which change of allotropic form takes place |
| D. | at which crystals grow bigger in size |
| E. | at which crystals are destroyed on heating |
| Answer» C. at which change of allotropic form takes place | |
| 59. |
Recrystallisation temperature can belowered by_________________? |
| A. | purification of metal |
| B. | grain refinement |
| C. | working at lower temperature |
| D. | all of the above |
| E. | none of the above |
| Answer» E. none of the above | |
| 60. |
Railway rails are normally made of_______________? |
| A. | mild steel |
| B. | alloy steel |
| C. | high carbon |
| D. | tungsten steel |
| E. | cast iron steel |
| Answer» D. tungsten steel | |
| 61. |
Pure iron is the structure of_______________? |
| A. | ferrite |
| B. | pearlite |
| C. | anstenite |
| D. | ferrite and cementite |
| E. | ferrite and pearlite |
| Answer» B. pearlite | |
| 62. |
Process of austempering results in__________________? |
| A. | formation of bainite structure |
| B. | carburised structure |
| C. | martenistic structure |
| D. | lamellar layers of carbide distributed throughout the structure |
| E. | relieving of stresses throughout a component |
| Answer» B. carburised structure | |
| 63. |
Preheating is essential in welding ___________________? |
| A. | cast iron |
| B. | high speed steel |
| C. | all non-ferrous materials |
| D. | all of the above |
| E. | none of the above |
| Answer» B. high speed steel | |
| 64. |
Points of arrest for iron correspond to__________________? |
| A. | stages at which allotropic forms change |
| B. | stages at which further heating does not increase temperature for some time |
| C. | stages at which properties do not change with increase in temperature |
| D. | there is nothing like points of arrest |
| E. | none of the above |
| Answer» B. stages at which further heating does not increase temperature for some time | |
| 65. |
Pipes for bicycle frames are made of___________________? |
| A. | cold rolled steel |
| B. | hot rolled steel |
| C. | forged steel |
| D. | cast steel |
| E. | carbon-chrome steel |
| Answer» B. hot rolled steel | |
| 66. |
Pig iron is the name given to________________? |
| A. | raw material for blast furnace |
| B. | product of blast furnace made by reduction of iron ore |
| C. | iron containing huge quantities of carbon |
| D. | iron in molten form in the ladles |
| E. | iron scrap |
| Answer» C. iron containing huge quantities of carbon | |
| 67. |
Pick up wrong statement about wrought iron ? |
| A. | It contains carbon of the order of 0 to 0.25% |
| B. | It melts at 1535°C |
| C. | It is very soft and ductile |
| D. | It can be easily forge welded |
| E. | It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling |
| Answer» F. | |
| 68. |
Pick up the wrong statement Nickel and chromium in steel help in _________________? |
| A. | providing corrosion resistance |
| B. | improving machining properties |
| C. | providing high strength at elevated temperatures |
| D. | raising the elastic limit |
| E. | improving the resilience and ductility |
| Answer» C. providing high strength at elevated temperatures | |
| 69. |
Phosphor bronze contains____________________? |
| A. | 0.5% of phosphorous |
| B. | 1% phosphorous |
| C. | 2.5% phosphorous |
| D. | 5% phosphorous |
| E. | none of the above |
| Answer» F. | |
| 70. |
Perminvar alloy having constant permeability is an alloy of________________? |
| A. | nickel, copper and iron |
| B. | nickel, copper and zinc |
| C. | copper, nickel and antimony |
| D. | iron, zinc and bismuth |
| E. | antimony, copper and zinc |
| Answer» B. nickel, copper and zinc | |
| 71. |
Permalloy is a___________________? |
| A. | kind of stainless steel |
| B. | none ferrous alloy |
| C. | polymer |
| D. | cutting tool material |
| E. | nickel and iron alloy having high permeability |
| Answer» F. | |
| 72. |
Pearlite is a combination of___________________? |
| A. | ferrite and cementite |
| B. | cementite and gamma iron |
| C. | ferrite and austenite |
| D. | ferrite and iron graphite |
| E. | pearlite and ferrite |
| Answer» B. cementite and gamma iron | |
| 73. |
Paramagnetic alpha iron changes to gamma iron at_______________? |
| A. | 770°C |
| B. | 910°C |
| C. | 1440°C |
| D. | 1539°C |
| E. | none of the above |
| Answer» C. 1440°C | |
| 74. |
Nodular iron has____________________? |
| A. | high maehinability |
| B. | low melting point |
| C. | high tensile strength |
| D. | good fluidity |
| E. | all of the above |
| Answer» F. | |
| 75. |
Neutral solution is one which has pH value__________________? |
| A. | greater than 7 |
| B. | less than 7 |
| C. | equal to 7 |
| D. | pH value has nothing to do with neutral solution |
| E. | none of the above |
| Answer» D. pH value has nothing to do with neutral solution | |
| 76. |
Muntz metal contains copper and zinc in the ratio of________________? |
| A. | 50 : 50 |
| B. | 40 : 60 |
| C. | 60 : 40 |
| D. | 20 : 80 |
| E. | 80 : 20 |
| Answer» D. 20 : 80 | |
| 77. |
Monel metal contains_________________? |
| A. | 63 to 67% nickel and 30% copper |
| B. | 88% copper and 10% tin and rest zinc |
| C. | alloy of tin, lead and cadmium |
| D. | malleable iron and zinc |
| E. | none of the above |
| Answer» B. 88% copper and 10% tin and rest zinc | |
| 78. |
Mild steel belongs to the following category___________________? |
| A. | low carbon steel |
| B. | medium carbon steel |
| C. | high carbon steel |
| D. | alloy steel |
| E. | special steel |
| Answer» B. medium carbon steel | |
| 79. |
Melting point of iron is__________________? |
| A. | 1539°C |
| B. | 1601°C |
| C. | 1489°C |
| D. | 1712°C |
| E. | 1131°C |
| Answer» B. 1601°C | |
| 80. |
Maximum percentage of carbon in austenite is______________? |
| A. | 0.025% |
| B. | 0.26% |
| C. | 0.8% |
| D. | 1.25% |
| E. | 1.7%. |
| Answer» F. | |
| 81. |
Maximum percentage of carbon in ferrite is___________________? |
| A. | 0.025% |
| B. | 0.06% |
| C. | 0.1% |
| D. | 0.25% |
| E. | 0.8%. |
| Answer» B. 0.06% | |
| 82. |
Materials after cold working are subjected to following process to relieve stresses__________________? |
| A. | hot working |
| B. | tempering |
| C. | normalising |
| D. | annealing |
| E. | special heat treatment |
| Answer» E. special heat treatment | |
| 83. |
Malleable cast iron _________________? |
| A. | contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron |
| B. | is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable |
| C. | is produced by annealing process. It is soft, tough, and easily machined metal |
| D. | is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout t |
| E. | none of the above |
| Answer» D. is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout t | |
| 84. |
Malleability of a material can be defined as ______________________? |
| A. | ability to undergo large permanent deformations in compression |
| B. | ability to recover its original form |
| C. | ability to undergo large permanent deformations in tension |
| D. | all of the above |
| E. | none of the above |
| Answer» B. ability to recover its original form | |
| 85. |
Machining properties of steel are improved by adding___________________? |
| A. | sulphur, lead, phosphorous |
| B. | silicon, aluminium, titanium |
| C. | vanadium, aluminium |
| D. | chromium, nickel |
| E. | lubricants |
| Answer» B. silicon, aluminium, titanium | |
| 86. |
Lead is poured into the joint between two pipes. These pipes may be made of____________________? |
| A. | cast iron |
| B. | vitrified clay |
| C. | asbestos cement |
| D. | concrete |
| E. | mild steel |
| Answer» B. vitrified clay | |
| 87. |
Large forgings, crank shafts, axles normally contain carbon up to________________? |
| A. | 0.05 to 0.20% |
| B. | 0.20 to 0.45% |
| C. | 0.45 to 0.55% |
| D. | 0.55 to 1.0% |
| E. | 1.0 to 1.2%. |
| Answer» D. 0.55 to 1.0% | |
| 88. |
‘Killed steels’ are those steels__________________? |
| A. | which are destroyed by burning |
| B. | which after their destruction are recycled to produce fresh steel |
| C. | which are deoxidised in the ladle with silicon and aluminium |
| D. | in which carbon is completely burnt |
| E. | which have poor properties due to improper manufacturing |
| Answer» D. in which carbon is completely burnt | |
| 89. |
Isotropic materials are those which have the same ____________________? |
| A. | elastic properties in all directions |
| B. | stresses induced in all directions |
| C. | thermal properties in all directions |
| D. | electric and magnetic properties in all directions |
| E. | density throughout |
| Answer» B. stresses induced in all directions | |
| 90. |
Iron is ____________________? |
| A. | paramagnetic |
| B. | ferromagnetic |
| C. | ferroelectric |
| D. | dielectric |
| E. | none of the above |
| Answer» C. ferroelectric | |
| 91. |
Induction hardening is the process of_____________________? |
| A. | hardening surface of workpiece to ob-tain hard and wear resistant surface |
| B. | heating and cooling rapidly |
| C. | increasing hardness throughout |
| D. | inducing hardness by continuous process |
| E. | hardening core |
| Answer» B. heating and cooling rapidly | |
| 92. |
increases the fluidity |
| A. | improves wear resistance, cutting ability and toughness |
| B. | refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties |
| C. | improves cutting ability and reduces hardenability |
| D. | gives ductility, toughness, tensile strength and anticorrosion properties |
| E. | none of the above |
| Answer» E. none of the above | |
| 93. |
Inconel is an alloy of___________________? |
| A. | nickel, chromium and iron |
| B. | nickel, copper |
| C. | nickel, chromium |
| D. | nickel, zinc |
| E. | nickel, lead |
| Answer» B. nickel, copper | |
| 94. |
In which of the following cases, consideration of creep is important_________________? |
| A. | flywheel of steam engine |
| B. | cast iron pipes |
| C. | cycle chains |
| D. | gas turbine blades |
| E. | piston I.C. engine |
| Answer» E. piston I.C. engine | |
| 95. |
In nodular iron, graphite is in the form of_____________________? |
| A. | cementite |
| B. | free carbon |
| C. | flakes |
| D. | spheroids |
| E. | nodular aggregates of graphite |
| Answer» E. nodular aggregates of graphite | |
| 96. |
In mottled cast iron, carbon is available in__________________? |
| A. | free form |
| B. | combined form |
| C. | nodular form |
| D. | flat form |
| E. | partly in free and partly in combined state |
| Answer» F. | |
| 97. |
In malleable iron, carbon is present in the form of___________________? |
| A. | cementite |
| B. | free carbon |
| C. | flakes |
| D. | spheroids |
| E. | nodular aggregates of graphite |
| Answer» F. | |
| 98. |
In grey cast iron, carbon is present in the form of____________________? |
| A. | cementite |
| B. | free carbon |
| C. | flakes |
| D. | spheroids |
| E. | nodular aggregates of graphite |
| Answer» D. spheroids | |
| 99. |
In compression, a prism of brittle material will break________________? |
| A. | by forming a bulge (l>) by shearing along oblique plane |
| B. | in direction perpendicular to application of load |
| C. | by crushing into thousands of pieces |
| D. | none of the above |
| Answer» B. in direction perpendicular to application of load | |
| 100. |
If a refractory contains high content of silicon, it means refractory is__________________? |
| A. | acidic |
| B. | basic |
| C. | neutral |
| D. | brittle |
| E. | none of the above |
| Answer» D. brittle | |