MCQOPTIONS
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MCQOPTIONS
This section includes 123 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In which of the following bonding theory, water molecules break down to form H+ and OH- ions? |
| A. | electrostatic bonding theory |
| B. | hot strength theory |
| C. | surface tension theory |
| D. | block and wedge theory |
| Answer» B. hot strength theory | |
| 52. |
Quality checking of riveted joint is much expensive than that of welded joint. |
| A. | true |
| B. | false |
| Answer» C. | |
| 53. |
In joining steel plate and asbestos, welding is preferred over riveting. |
| A. | true |
| B. | false |
| Answer» C. | |
| 54. |
Riveting is not recommended for aluminium alloys. |
| A. | true |
| B. | false |
| Answer» C. | |
| 55. |
Among punching and drilling, punching is safer. |
| A. | true |
| B. | false |
| Answer» C. | |
| 56. |
The amount by which the two rods to be joined are drawn together is called as? |
| A. | draw |
| B. | portray |
| C. | lead |
| D. | pitch |
| Answer» B. portray | |
| 57. |
In hot riveting the shank portion is subjected to compressive stress. |
| A. | true |
| B. | false |
| Answer» C. | |
| 58. |
In hand riveting die is a part of hammer. |
| A. | true |
| B. | false |
| C. | topic 3.5 riveted joints for structures |
| Answer» C. topic 3.5 riveted joints for structures | |
| 59. |
A rivet is specified as a 20mm rivet. What does it mean? |
| A. | none of the mentioned |
| B. | shank dia 20mm |
| C. | head dia 20mm |
| D. | both head and shank dia 20mm |
| Answer» C. head dia 20mm | |
| 60. |
Which of the following isn’t a main part of rivet? |
| A. | head |
| B. | shank |
| C. | point |
| D. | thread |
| Answer» E. | |
| 61. |
Hard peening is |
| A. | hammering the weld across the length while the joint is hot |
| B. | hammering the weld along the length while the joint is hot |
| C. | hammering the weld along the length while the joint is cold |
| D. | hammering the weld across the length while the joint is cold |
| Answer» C. hammering the weld along the length while the joint is cold | |
| 62. |
Which type of welding is generally used in automobile sector? |
| A. | electric arc welding |
| B. | electric resistance welding |
| C. | gas welding |
| D. | forge welding |
| Answer» C. gas welding | |
| 63. |
In gas welding which of the following is generally used? |
| A. | oxygen-hydrogen |
| B. | oxygen-acetylene |
| C. | oxygen-hydrogen or oxygen-acetylene |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 64. |
Filler material is used in electric resistance welding. |
| A. | yes |
| B. | no filler material used |
| C. | depends on the type of welding |
| D. | none of the listed |
| Answer» C. depends on the type of welding | |
| 65. |
Rails in the field are generally welded by using |
| A. | thermit welding |
| B. | gas welding |
| C. | electric arc welding |
| D. | forge welding |
| Answer» B. gas welding | |
| 66. |
Themit consists of a finely divided mixture of iron oxide and copper. |
| A. | true |
| B. | false |
| Answer» C. | |
| 67. |
The capacity of welded structures to damp vibrations is quite good. |
| A. | true |
| B. | false |
| Answer» C. | |
| 68. |
Thickness of plate is required more in welding than in riveting. |
| A. | true |
| B. | false |
| Answer» C. | |
| 69. |
Cotter joint can be used to connect two rods for torque transmission purpose. |
| A. | true |
| B. | false |
| Answer» C. | |
| 70. |
Cold riveting holds the connected parts better than hot riveting. |
| A. | true |
| B. | false |
| Answer» C. | |
| 71. |
67 N/mm².; Spigot dia=65mm; thickness 0f collar=15mm |
| A. | 131mm |
| B. | 139mm |
| C. | 141mm |
| D. | 149mm |
| Answer» B. 139mm | |
| 72. |
Which of the following is not a part of cotter joint? |
| A. | socket |
| B. | spigot |
| C. | cotter |
| D. | collar |
| Answer» E. | |
| 73. |
Can the cotter joint be used to connect slide spindle and fork of valve mechanism? |
| A. | true |
| B. | false |
| Answer» B. false | |
| 74. |
The principle of wedge action is used in cotter joint. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 75. |
Which of the following are important parts of knuckle joint? |
| A. | eye |
| B. | pin |
| C. | fork |
| D. | each of the mentioned |
| Answer» E. | |
| 76. |
Determine the size of the bolts if yield strength of bolt is 400N/mm² and factor of safety is 4. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm. Also P=5kN acts at a distance of 200mm from the channel. |
| A. | 14.34mm |
| B. | 13.44mm c) 15.44mm d) 12.66mm |
| Answer» C. | |
| 77. |
A knuckle joint is unsuitable for two rotating shafts, which transmit torque |
| A. | true |
| B. | false |
| Answer» B. false | |
| 78. |
A knuckle joint can be used in valve mechanism of a reciprocating engine. |
| A. | yes |
| B. | no |
| C. | yes but there are stress probles |
| D. | no as it is very dangerous to use |
| Answer» B. no | |
| 79. |
Determine the secondary shear stress acting on the bolt 3 and its direction. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm.Also P=5kN acts at a distance of 200mm from the channel. |
| A. | 6100n vertically up |
| B. | 4500n vertically down |
| C. | 6100n vertically up |
| D. | 4500n vertically down |
| Answer» D. 4500n vertically down | |
| 80. |
Which bolt is under maximum shear stress? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | all are under equivalent shear stress |
| Answer» D. all are under equivalent shear stress | |
| 81. |
8’CW from the vertical. Hence net shear force = √ [5000cos36.8+1250]²+ [5000sin36.8]². |
| A. | 10.74mm |
| B. | 9.23mm c) 11.54mm |
| C. | d) 8.68mm |
| Answer» B. 9.23mm c) 11.54mm | |
| 82. |
Flexible shafts have              rigidity in bending moment. |
| A. | high |
| B. | low |
| C. | very high |
| D. | extremely low |
| Answer» C. very high | |
| 83. |
For which of the following design factor of safety the design will work properly? |
| A. | 0.1 |
| B. | 1 |
| C. | 2 d) 0.9 |
| Answer» D. | |
| 84. |
Flexible shafts have        rigidity in torsion making them flexible. |
| A. | low |
| B. | high |
| C. | very high |
| D. | infinitely small |
| Answer» C. very high | |
| 85. |
Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm². |
| A. | none of the listed |
| B. | 41.2mm |
| C. | 35.8mm |
| D. | 38.8mm |
| Answer» C. 35.8mm | |
| 86. |
If yielding strength=400N/mm², the find the permissible shear stress according to ASME standards. |
| A. | 72 n/mm² |
| B. | 76 n/mm² |
| C. | 268 n/mm² |
| D. | 422 n/mm² |
| Answer» B. 76 n/mm² | |
| 87. |
Does ASME Standard take into consideration shock and fatigue factors? |
| A. | yes |
| B. | no |
| Answer» B. no | |
| 88. |
Design factor for most aircraft structures is 2. |
| A. | true |
| B. | false |
| Answer» C. | |
| 89. |
If bending moment on point B in horizontal plate is M and in vertical plane is m, then the net bending moment at point B is? |
| A. | m |
| B. | m |
| C. | m+m |
| D. | √m²+m² |
| Answer» E. | |
| 90. |
What is a safe factor of failure for a component which on failure can result in financial loss or serious injury? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 91. |
What can understand by the factor of safety equal to one? |
| A. | it means that the structure will fail under load |
| B. | it means that the structure will only support the actual load |
| C. | it means that the structure will support more than the actual load |
| D. | there is no relation between factor safety and load application |
| Answer» C. it means that the structure will support more than the actual load | |
| 92. |
Factor of safety is used to find out the reliability of the design. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 93. |
Which of the following can be the factor of safety for a dead load? |
| A. | 6 |
| B. | 2 |
| C. | 4 |
| D. | 7 |
| Answer» D. 7 | |
| 94. |
Which of the following is the numerator of factor safety formula? |
| A. | working stress |
| B. | shear stress |
| C. | tensile stress |
| D. | ultimate stress |
| Answer» E. | |
| 95. |
Residual stresses are always added in the load stresses and hence are always harmful. |
| A. | true |
| B. | false |
| Answer» C. | |
| 96. |
1816/ [7200 x 10.8184 x 50] or σ=100.6N/mm². |
| A. | 14.80mm |
| B. | 13.95mm |
| C. | 16.5mm |
| D. | 17.2mm |
| Answer» C. 16.5mm | |
| 97. |
If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load. |
| A. | 97.3 |
| B. | 95.8 |
| C. | 100.6 |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 98. |
The bending stress in a straight beam varies linearly with the distance from neural axis like that in a curved beam. |
| A. | true |
| B. | false |
| C. | topic 1.4 impact and shock loading - calculation of principle stresses for various load combinations, eccentric loading - curved beams - crane hook and €ˌc€„¢ frame |
| Answer» C. topic 1.4 impact and shock loading - calculation of principle stresses for various load combinations, eccentric loading - curved beams - crane hook and €ˌc€„¢ frame | |
| 99. |
A curved beam has neutral axis is curved while loaded and straight when unloaded. |
| A. | true |
| B. | false |
| Answer» C. | |
| 100. |
How many modes are there for crack propagation? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |