MCQOPTIONS
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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Nodular cast iron is produced by adding __________ to the molten cast iron. |
| A. | nickel |
| B. | chromium |
| C. | copper |
| D. | magnesium |
| Answer» E. | |
| 52. |
Free carbon in iron makes the metal |
| A. | soft and gives a coarse grained crystalline structure |
| B. | soft and gives a fine grained crystalline structure |
| C. | hard and gives a coarse grained crystalline structure |
| D. | hard and gives a fine grained crystalline structure |
| Answer» B. soft and gives a fine grained crystalline structure | |
| 53. |
The steel produced by bessemer or open hearth process is __________ to that produced by L-D process. |
| A. | superior |
| B. | inferior |
| Answer» C. | |
| 54. |
The cupola is used to manufacture |
| A. | pig iron |
| B. | cast iron |
| C. | wrought iron |
| D. | steel |
| Answer» C. wrought iron | |
| 55. |
Iron ore is, usually, found in the form of |
| A. | oxides |
| B. | carbonates |
| C. | sulphides |
| D. | all of these |
| Answer» E. | |
| 56. |
The hardness of steel increases if it contains |
| A. | pearlite |
| B. | ferrite |
| C. | cementite |
| D. | martensite |
| Answer» D. martensite | |
| 57. |
In full annealing, the hypo-eutectoid steel is heated from 30 C to 50 C above the upper critical temperature and then cooled |
| A. | in still air |
| B. | slowly in the furnace |
| C. | suddenly in a suitable cooling medium |
| D. | any one of these |
| Answer» C. suddenly in a suitable cooling medium | |
| 58. |
Ferrite and pearlite makes the steel soft and ductile. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 59. |
The coke in the charge of blast furnace |
| A. | controls the grade of pig iron |
| B. | acts as an iron-bearing mineral |
| C. | supplies heat to reduce ore and melt the iron |
| D. | forms a slag by combining with impurities |
| Answer» D. forms a slag by combining with impurities | |
| 60. |
Nimonic contains __________ percentage of nickel as that of Inconel. |
| A. | same |
| B. | less |
| C. | more |
| Answer» B. less | |
| 61. |
The heat treatment process used for softening hardened steel is |
| A. | carburising |
| B. | normalising |
| C. | annealing |
| D. | tempering |
| Answer» E. | |
| 62. |
The lower critical point for all steels is |
| A. | 600 C |
| B. | 700 C |
| C. | 723 C |
| D. | 913 C |
| Answer» D. 913 C | |
| 63. |
Dye penetrant method is generally used to locate |
| A. | core defects |
| B. | surface defects |
| C. | superficial defects |
| D. | temporary defects |
| Answer» C. superficial defects | |
| 64. |
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as |
| A. | eutectic cast irons |
| B. | hypo-eutectic cast irons |
| C. | hyper-eutectic cast irons |
| D. | none of these |
| Answer» C. hyper-eutectic cast irons | |
| 65. |
The type of space lattice found in gamma-iron is |
| A. | face centred cubic space lattice |
| B. | body centred cubic space lattice |
| C. | close packed hexagonal space lattice |
| D. | none of these |
| Answer» B. body centred cubic space lattice | |
| 66. |
The property of a material due to which it breaks with little permanent distortion, is called |
| A. | brittleness |
| B. | ductility |
| C. | malleability |
| D. | plasticity |
| Answer» B. ductility | |
| 67. |
The lower critical temperature |
| A. | decreases as the carbon content in steel increases |
| B. | increases as the carbon content in steel increases |
| C. | is same for all steels |
| D. | depends upon the rate of heating |
| Answer» D. depends upon the rate of heating | |
| 68. |
The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 69. |
The unit cells |
| A. | contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal |
| B. | have the same orientation and their similar faces are parallel |
| C. | may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice |
| D. | all of the above |
| Answer» E. | |
| 70. |
A small percentage of boron is added to steel in order to |
| A. | increase hardenability |
| B. | reduce machinability |
| C. | increase wear resistance |
| D. | increase endurance strength |
| Answer» B. reduce machinability | |
| 71. |
The charge is fed into the blast furnace through the |
| A. | stack |
| B. | throat |
| C. | bosh |
| D. | tuyers |
| Answer» C. bosh | |
| 72. |
Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur? |
| A. | Bessemer process |
| B. | Open hearth process |
| C. | Duplex process |
| D. | Electric process |
| Answer» D. Electric process | |
| 73. |
The quenching of steel from the upper critical point results in a fine grained structure. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 74. |
An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and |
| A. | chromium |
| B. | silicon |
| C. | manganese |
| D. | magnesium |
| Answer» D. magnesium | |
| 75. |
Which of the following has a fine gold colour and is used for imitation jewellery? |
| A. | Silicon bronze |
| B. | Aluminium bronze |
| C. | Gun metal |
| D. | Babbit metal |
| Answer» C. Gun metal | |
| 76. |
When the steel is normalised, its |
| A. | yield point increases |
| B. | ductility decreases |
| C. | ultimate tensile strength increases |
| D. | all of these |
| Answer» E. | |
| 77. |
White cast iron has a high tensile strength and a low compressive strength. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 78. |
The sliding pairs, turning pairs and screw pairs form lower pairs. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 79. |
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke ( ) is equal to |
| A. | 90 and 180 |
| B. | 45 and 225 |
| C. | 180 and 270 |
| D. | 270 and 360 |
| Answer» C. 180 and 270 | |
| 80. |
The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations. |
| A. | more than |
| B. | less than |
| C. | same as |
| Answer» C. same as | |
| 81. |
Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 82. |
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 83. |
When a particle moves round the circumference of a circle of radius r with rad/s, then its maximum acceleration is 2r. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 84. |
The dynamic friction is the friction experienced by a body, when the body |
| A. | is in motion |
| B. | is at rest |
| C. | just begins to slide over the surface of the other body |
| D. | none of the above |
| Answer» B. is at rest | |
| 85. |
A screw is said to be over hauling screw, if its efficiency is |
| A. | less than 50% |
| B. | more than 50% |
| C. | equal to 50% |
| D. | none of these |
| Answer» C. equal to 50% | |
| 86. |
The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 87. |
In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines, |
| A. | the algebraic sum of the primary forces must be equal to zero |
| B. | the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 88. |
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the |
| A. | pitch circle |
| B. | base circle |
| C. | pitch curve |
| D. | prime circle |
| Answer» D. prime circle | |
| 89. |
The gear train usually employed in clocks is a |
| A. | simple gear train |
| B. | reverted gear train |
| C. | sun and planet gear |
| D. | differential gear |
| Answer» C. sun and planet gear | |
| 90. |
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is |
| A. | 1.4 N-s/m |
| B. | 18.52 N-s/m |
| C. | 52.92 N-s/m |
| D. | 529.2 N-s/m |
| Answer» D. 529.2 N-s/m | |
| 91. |
The value of stress concentration factor depends upon |
| A. | material of the part |
| B. | geometry of the part |
| C. | material and geometry of the part |
| D. | none of these |
| Answer» D. none of these | |
| 92. |
A crankshaft is a __________ shaft. |
| A. | transmission |
| B. | machine |
| Answer» C. | |
| 93. |
According to Indian standard specifications, 100 H6/g5 means that the |
| A. | actual size is 100 mm |
| B. | basic size is 100 mm |
| C. | difference between the actual size and basic size is 100 mm |
| D. | none of the above |
| Answer» C. difference between the actual size and basic size is 100 mm | |
| 94. |
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called |
| A. | castle nut |
| B. | jam nut |
| C. | ring nut |
| D. | sawn nut |
| Answer» D. sawn nut | |
| 95. |
Slenderness ratio is the ratio of |
| A. | maximum size of column to minimum size of column |
| B. | width of column to depth of column |
| C. | effective length of column to least radius of gyration of the column |
| D. | effective length of column to width of column |
| Answer» D. effective length of column to width of column | |
| 96. |
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where = Stress for a plate with no hole i.e. nominal stress) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/563-94-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/563-94-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/563-94-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/563-94-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/machine-design/563-94-3.png"> | |
| 97. |
The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 98. |
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to |
| A. | zero |
| B. | one |
| C. | /2 |
| D. | |
| Answer» C. /2 | |
| 99. |
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.6 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 100. |
The sleeve or muff coupling is designed as a |
| A. | dun cylinder |
| B. | thick cylinder |
| C. | solid shaft |
| D. | hollow shaft |
| Answer» E. | |