MCQOPTIONS
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MCQOPTIONS
This section includes 1003 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 case of pressure vessels having open ends, the fluid pressure induces |
| A. | longitudinal stress |
| B. | circumferential stress |
| C. | shear stress |
| D. | none of these |
| Answer» C. shear stress | |
| 52. |
The set screws are used to prevent relative motion between the two parts. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 53. |
Two shafts will have equal strength, if |
| A. | diameter of both the shafts is same |
| B. | angle of twist of both the shafts is same |
| C. | material of both the shafts is same |
| D. | twisting moment of both the shafts is same |
| Answer» E. | |
| 54. |
A turn buckle is used to connect two round rods subjected to tensile loading and requiring subsequent adjustment for tightening or loosening. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 55. |
The plasticity is the property of a material which enables it to |
| A. | regain its original shape after deformation when the external forces are removed |
| B. | draw into wires by the application of a tensile force |
| C. | resist fracture due to high impact loads |
| D. | retain deformation produced under load permanently |
| Answer» E. | |
| 56. |
An open coiled helical compression spring '' of mean diameter 50 mm is subjected to an axial load . Another spring '' of mean diameter 25 mm is similar to spring '' in all respects. The deflection of spring '' will be __________ as compared to spring ''. |
| A. | one-eighth |
| B. | one-fourth |
| C. | one-half |
| D. | double |
| Answer» B. one-fourth | |
| 57. |
During hot working of metals, |
| A. | porosity of the metal is largely eliminated |
| B. | grain structure of the metal is refined |
| C. | mechanical properties are improved due of refinement of grains |
| D. | all of the above |
| Answer» E. | |
| 58. |
The static tooth load should be __________ the dynamic load. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 59. |
Power screws are used to convert rotary motion into translatory motion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 60. |
The function of the washer is to |
| A. | fill up the axial gap |
| B. | provide bearing area |
| C. | provide cushioning effect |
| D. | absorb shocks and vibrations |
| Answer» C. provide cushioning effect | |
| 61. |
A rivet is specified by |
| A. | shank diameter |
| B. | length of rivet |
| C. | type of head |
| D. | length of tail |
| Answer» B. length of rivet | |
| 62. |
In thrust bearings, the load acts |
| A. | along the axis of rotation |
| B. | parallel to the axis of rotation |
| C. | perpendicular to the axis of rotation |
| D. | in any direction |
| Answer» B. parallel to the axis of rotation | |
| 63. |
According to Indian standard specifications, a grey cast iron designated by 'FG 200' means that the |
| A. | carbon content is 2% |
| B. | maximum compressive strength is 200 N/mm |
| C. | minimum tensile strength is 200 N/mm |
| D. | maximum shear strength is 200 N/mm |
| Answer» D. maximum shear strength is 200 N/mm | |
| 64. |
In the levers of first type, the mechanical advantage is __________ one. |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» D. | |
| 65. |
The load placed at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swivelling mechanism. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 66. |
The usual proportion for the width of key is (where = Diameter of shaft or diameter of hole in the hub) |
| A. | /8 |
| B. | /6 |
| C. | /4 |
| D. | /2 |
| Answer» D. /2 | |
| 67. |
Two concentric helical springs used to provide greater spring force are wound is opposite direction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 68. |
The ratio of driving tensions in V-belt drives is __________ flat belt drives. |
| A. | equal to |
| B. | sin α times more than |
| C. | sin α times less than |
| D. | cosec α times more than |
| Answer» E. | |
| 69. |
Two rigid plates are clamped by means of bolt and nut with an initial force . After tightening, a separating force ( < ) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is |
| A. | + |
| B. | - |
| Answer» B. - | |
| 70. |
The shear stress at a point in a shaft subjected to a torque is |
| A. | directly proportional to the polar moment of inertia and to the distance of the point from the axis |
| B. | directly proportional to the applied torque and inversely proportional to the polar moment of inertia |
| C. | directly proportional to the applied torque and the polar moment of inertia |
| D. | inversely proportional to the applied torque and the polar moment of inertia |
| Answer» C. directly proportional to the applied torque and the polar moment of inertia | |
| 71. |
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress. |
| A. | one-fourth |
| B. | one-third |
| C. | one-half |
| D. | double |
| Answer» C. one-half | |
| 72. |
The design of pin of a rocker arm of an I.C. engine is based on |
| A. | bearing failure |
| B. | shearing failure |
| C. | bending failure |
| D. | all of these |
| Answer» E. | |
| 73. |
A wood-ruff key is |
| A. | a tapered key with head at one end |
| B. | fitted in pairs at right angles |
| C. | capable of tilting in a recess milled out in the shaft |
| D. | all of the above |
| Answer» D. all of the above | |
| 74. |
In a V-belt drive, the belt makes contact at the bottom of the groove of the pulley. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 75. |
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the |
| A. | initial tension |
| B. | external load applied |
| C. | sum of the initial tension and external load applied |
| D. | initial tension or external load, whichever is greater |
| Answer» D. initial tension or external load, whichever is greater | |
| 76. |
Which one of the following loading is considered for the design of axles? |
| A. | Bending moment only |
| B. | Twisting moment only |
| C. | Combined bending moment and twisting moments |
| D. | Combined action of bending moment, twisting moment and axial thrust |
| Answer» B. Twisting moment only | |
| 77. |
The shear stress in a beam varies from zero at the outer fibres to a maximum at the neutral surface. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 78. |
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways. |
| A. | 90° |
| B. | 135° |
| C. | 160° |
| D. | 180° |
| Answer» B. 135° | |
| 79. |
In worm gears, the pressure angle is half the angle between two inclined faces in axial plane. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 80. |
For crank shaft bearings, the ratio of the length of the journal to its diameter is less than unity. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 81. |
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that |
| A. | the effect of curvature of the cylinder wall is neglected |
| B. | the tensile stresses are uniformly distributed over the section of the walls |
| C. | the effect of the restraining action of the heads at the end of the pressure vessel is neglected |
| D. | all of the above |
| Answer» E. | |
| 82. |
In designing a connecting rod, it is considered like __________ for buckling about Y-axis. |
| A. | both ends hinged |
| B. | both ends fixed |
| C. | one end fixed and the other end hinged |
| D. | one end fixed and the other end free |
| Answer» C. one end fixed and the other end hinged | |
| 83. |
A steel containing __________ 0.8% carbon is known as hypo-eutectoid steel. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 84. |
When two non-parallel or intersecting but coplaner shafts are connected by gears, the arrangement is known as bevel gearing. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 85. |
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a |
| A. | short bearing |
| B. | long bearing |
| C. | medium bearing |
| D. | square bearing |
| Answer» E. | |
| 86. |
A connecting rod should be |
| A. | strong in buckling about X-axis |
| B. | strong in buckling about Y-axis |
| C. | equally strong in buckling about X-axis and Y-axis |
| D. | any one of the above |
| Answer» D. any one of the above | |
| 87. |
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» E. | |
| 88. |
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by |
| A. | increasing the length of bar |
| B. | decreasing the cross-sectional area of the bar |
| C. | decreasing the modulus of elasticity of the bar |
| D. | all of the above |
| Answer» E. | |
| 89. |
A shaft is designed on the basis of rigidity and stiffness. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 90. |
Which of the following spring is used in mechanical wrist watch? |
| A. | Helical compression spring |
| B. | Spiral spring |
| C. | Torsion spring |
| D. | Bellevile spring |
| Answer» D. Bellevile spring | |
| 91. |
In helical bevel gearing, the axes of shafts are __________ and the teeth are curved. |
| A. | intersecting |
| B. | non-intersecting and non-parallel |
| Answer» C. | |
| 92. |
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as hollow saddle key. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 93. |
In levers, leverage is the ratio of |
| A. | load lifted to the effort applied |
| B. | mechanical advantage to the velocity ratio |
| C. | load arm to the effort arm |
| D. | effort arm to the load arm |
| Answer» E. | |
| 94. |
The diameter of washer is generally taken bigger than the nut size. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 95. |
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value? |
| A. | Maximum principal stress theory |
| B. | Maximum shear stress theory |
| C. | Maximum strain energy theory |
| D. | Maximum distortion energy theory |
| Answer» B. Maximum shear stress theory | |
| 96. |
The radial stress across the thickness of a thick cylinder is maximum at the inner surface and zero at the outer surface. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 97. |
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» D. | |
| 98. |
The resilience of a bolt may be increased by |
| A. | increasing its shank diameter |
| B. | increasing its length |
| C. | decreasing its shank diameter |
| D. | decreasing its length |
| Answer» C. decreasing its shank diameter | |
| 99. |
In worm, gears, pitch lead angle is |
| A. | half the angle between two inclined faces in axial plane |
| B. | the angle between the tangent to the pitch helix and the plane of rotation |
| C. | the angle between the tangent to the pitch helix and an element of the cylinder |
| D. | none of the above |
| Answer» C. the angle between the tangent to the pitch helix and an element of the cylinder | |
| 100. |
The ratio of the ultimate stress to the design stress is known as |
| A. | elastic limit |
| B. | strain |
| C. | factor of safety |
| D. | bulk modulus |
| Answer» D. bulk modulus | |