McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 101. |
In a tensile test of specimen,the ratio of maximum load to the original cross sectional area of test piece is called |
| A. | yield stress |
| B. | ultimate stress |
| C. | safe stress |
| D. | breaking stress |
| Answer» B. ultimate stress | |
| 102. |
In a body, thermal stress is one which arises because of the existence of |
| A. | latent heat |
| B. | temperature gradient |
| C. | total heat |
| D. | specific heat |
| Answer» B. temperature gradient | |
| 103. |
A localized compressive stress at the area of contact between the two surfaces is called as |
| A. | tensile stress |
| B. | bending stress |
| C. | bearing stress |
| D. | shear stress |
| Answer» C. bearing stress | |
| 104. |
The ratio between change in volume to original volume of body is called ………… strain. |
| A. | tensile |
| B. | compressive |
| C. | shear |
| D. | volumetric |
| Answer» D. volumetric | |
| 105. |
There is always a limiting value of load up to which the strain totally disappears on the removal of load; the stress corresponding to this load is called………… |
| A. | elastic limit |
| B. | unit stress |
| C. | yield stress |
| D. | none of the above |
| Answer» A. elastic limit | |
| 106. |
Robert Hooke discovered experimentally that within elastic limit |
| A. | stress = strain |
| B. | stress x strain = constant |
| C. | stress/strain = constant |
| D. | none of the above |
| Answer» C. stress/strain = constant | |
| 107. |
When a tensile or compressive force (P) acts on a body, the change in its length is given by |
| A. | pl/ae |
| B. | ae/pl |
| C. | pe/al |
| D. | pa/le |
| Answer» A. pl/ae | |
| 108. |
Modulus of elasticity is defined as the ratio of |
| A. | shear stress to shear strain |
| B. | linear stress to linear strain |
| C. | linear strain to lateral strain |
| D. | lateral strain to linear strain |
| Answer» B. linear stress to linear strain | |
| 109. |
The ratio of linear strain to lateral strain is known as |
| A. | modulus of elasticity |
| B. | modulus of rigidity |
| C. | poisson's ratio |
| D. | none of above |
| Answer» D. none of above | |
| 110. |
The ratio of lateral strain to linear strain is known as |
| A. | modulus of elasticity |
| B. | modulus of rigidity |
| C. | poisson's ratio |
| D. | elastic limit |
| Answer» C. poisson's ratio | |
| 111. |
The relation between E (modulus of elasticity) and C (modulus of rigidity) is given by |
| A. | e = c (1+µ) |
| B. | e =2 c (1+µ) |
| C. | e = c (1+2µ) |
| D. | e =2 c (1+2µ) |
| Answer» B. e =2 c (1+µ) | |
| 112. |
The relation between E (modulus of elasticity) and K (bulk modulus of elasticity) is given by |
| A. | e=k(1-2µ) |
| B. | e=2k(1-2µ) |
| C. | e=3k(1-2µ) |
| D. | e=4k(1-2µ) |
| Answer» C. e=3k(1-2µ) | |
| 113. |
Relation between E, K and C is given by |
| A. | e=9kc/(3k+c) |
| B. | e=(3k+c)/6kc |
| C. | e=6kc/(k+3c) |
| D. | e=3kc/(3k+c) |
| Answer» A. e=9kc/(3k+c) | |
| 114. |
Which of the following statement is incorrect? |
| A. | stress is directly proportional to strain within elastic limit |
| B. | the stress is force per unit area. |
| C. | hooke's law holds good up to the breaking point |
| D. | the ratio of linear stress to linear strain is called young's modulus. |
| Answer» C. hooke's law holds good up to the breaking point | |
| 115. |
When a bar is subjected to a change of temperature and its deformation is prevented, which of the following stress is induced? |
| A. | thermal stress |
| B. | shear stress |
| C. | tensile stress |
| D. | compressive stress |
| Answer» A. thermal stress | |
| 116. |
Temperature stress developed in a bar depends on which of the following? |
| A. | coefficient of linear expansion |
| B. | change of temperature |
| C. | young's modulus |
| D. | all of above |
| Answer» D. all of above | |
| 117. |
The temperature strain in a bar is ……………..proportional to the change in temperature. |
| A. | directly |
| B. | indirectly |
| C. | either of above |
| D. | none of the above |
| Answer» A. directly | |
| 118. |
…………….Strain is the deformation of the bar per unit length in the direction of force. |
| A. | volumetric |
| B. | shear |
| C. | lateral |
| D. | linear |
| Answer» D. linear | |
| 119. |
Strain in a direction at right angles to the direction of applied force is known as |
| A. | lateral strain |
| B. | shear strain |
| C. | volumetric strain |
| D. | none of the above |
| Answer» A. lateral strain | |
| 120. |
A localized compressive stress at the area of contact between two members is known as ……………..stress. |
| A. | shear |
| B. | crushing |
| C. | bending |
| D. | tensile |
| Answer» B. crushing | |
| 121. |
A material with identical properties in all directions is known as |
| A. | homogeneous |
| B. | isotropic |
| C. | elastic |
| D. | none of the above |
| Answer» A. homogeneous | |
| 122. |
The units of stress in the SI system are |
| A. | kg/m2 |
| B. | n/m2 |
| C. | kg/mm2 |
| D. | none of the above |
| Answer» B. n/m2 | |
| 123. |
In a lap riveted joint the rivets are mainly subjected to --------------stress |
| A. | shear |
| B. | tensile |
| C. | bending |
| D. | compressive |
| Answer» A. shear | |
| 124. |
The resistance to deformation of a body per unit area is known as |
| A. | stress |
| B. | strain |
| C. | modulus of elasticity |
| D. | modulus of rigidity |
| Answer» A. stress | |
| 125. |
stress developed due to external force in an elastic material |
| A. | depends on elastic constants |
| B. | does not depend on elastic constants |
| C. | depends partially on elastic constants |
| D. | none of the above |
| Answer» B. does not depend on elastic constants | |
| 126. |
Strain is defined as deformation per unit |
| A. | area |
| B. | length |
| C. | load |
| D. | volume |
| Answer» B. length | |
| 127. |
The units of modulus of elasticity are the same as of |
| A. | stress |
| B. | modulus of rigidity |
| C. | pressure |
| D. | any of the above |
| Answer» D. any of the above | |
| 128. |
Approximate value of Young's modulus for mild steel is |
| A. | 100gpa |
| B. | 205mpa |
| C. | 205gpa |
| D. | 100mpa |
| Answer» C. 205gpa | |
| 129. |
1MPa is equal to |
| A. | 1n/m2 |
| B. | 1 n/mm2 |
| C. | 1kn/m2 |
| D. | 1kn/mm2 |
| Answer» B. 1 n/mm2 | |
| 130. |
Temperature stress is a function of |
| A. | modulus of elasticity |
| B. | coefficient of linear expansion |
| C. | change in temperature |
| D. | all of the above |
| Answer» D. all of the above | |
| 131. |
Factor of safety is defined as ratio of |
| A. | ultimate stress to allowable stress |
| B. | ultimate stress to yield stress |
| C. | allowable stress to yield stress |
| D. | allowable stress to ultimate stress |
| Answer» A. ultimate stress to allowable stress | |
| 132. |
The stress at which elongation of a material is quite large as compared to increase in load is known as |
| A. | ultimate point |
| B. | yield point |
| C. | elastic limit |
| D. | rupture point |
| Answer» B. yield point | |
| 133. |
Poisson's ratio is defined as ratio of |
| A. | axial strain to transverse strain |
| B. | transverse strain to axial strain |
| C. | shear strain to axial strain |
| D. | axial strain to shear strain |
| Answer» B. transverse strain to axial strain | |
| 134. |
During free expansion due to temperature rise or fall, |
| A. | no stress is developed |
| B. | no strain is developed |
| C. | both are developed |
| D. | only stress is developed but strain not developed |
| Answer» A. no stress is developed | |
| 135. |
For any material, the maximum value of E in terms of G is E = |
| A. | g |
| B. | 2g |
| C. | 3g |
| D. | 2.5g |
| Answer» C. 3g | |
| 136. |
For any material, the minimum value of E in terms of G is E |
| A. | g |
| B. | 2g |
| C. | 3g |
| D. | 2.5g |
| Answer» B. 2g | |
| 137. |
Two materials are having modulus of elasticity, modulus of rigidities and bulk modulus as (E1, E2), (C1, C2), and (K1, K2). The modulus ratio is given by |
| A. | e1/c2 |
| B. | e1/k2 |
| C. | e1/e2 |
| D. | c1/k2 |
| Answer» C. e1/e2 | |
| 138. |
The force |
| A. | stiffness |
| B. | plasticity |
| C. | flexibility |
| D. | resilience |
| Answer» A. stiffness | |
| 139. |
Thermal stress is developed in a temperature when _. |
| A. | allowed to expand freely |
| B. | not allowed to expand freely |
| C. | either a) or b) |
| D. | none of the above |
| Answer» B. not allowed to expand freely | |
| 140. |
Which of the following beams will develop thermal stress when subjected to a change in temperature ? |
| A. | cantilever beam |
| B. | beam with hinges at both ends |
| C. | simply supported beam |
| D. | none of the above |
| Answer» B. beam with hinges at both ends | |
| 141. |
Change in length of a rod due to change in depend on _. |
| A. | original length |
| B. | change in temperature |
| C. | modulus of elasticity |
| D. | coefficient of thermal expansion |
| Answer» C. modulus of elasticity | |
| 142. |
A steel strip is welded to a copper strip of the same dimensions along the length. The coefficient of thermal expansion for copper is greater than that for steel. If temperature is increased, ___ . |
| A. | copper has tensile stress |
| B. | steel has tensile stress |
| C. | both have tensile stress |
| D. | none of the above |
| Answer» B. steel has tensile stress | |
| 143. |
While punching a hole in a metal sheet using a punch, stress is developed in the metal sheet. |
| A. | normal compressive |
| B. | normal tensile |
| C. | shear |
| D. | lateral |
| Answer» C. shear | |
| 144. |
While punching a hole in a metal sheet using a punch, stress is developed in the Punch. |
| A. | normal compressive |
| B. | normal tensile |
| C. | shear |
| D. | lateral |
| Answer» A. normal compressive | |
| 145. |
Poisson’s ratio for rubber is……that for steel. |
| A. | larger than |
| B. | equal to |
| C. | smaller than |
| D. | any of the above |
| Answer» A. larger than | |
| 146. |
For a certain material, the Poisson's ratio is 0. The relation between modulus of elasticity E and the bulk modulus K is E = ____ _. |
| A. | 0 |
| B. | 3k |
| C. | 1.5k |
| D. | 1.2k |
| Answer» B. 3k | |
| 147. |
For a certain material, E = 3K . The value of Poisson's ratio for the material will be__ _. |
| A. | 0 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 0.75 |
| Answer» A. 0 | |
| 148. |
Modulus of rigidity is defined as the ratio of |
| A. | longitudinal stress to longitudinal strain |
| B. | shear stress to shear strain |
| C. | stress to strain |
| D. | stress to volumetric strain |
| Answer» B. shear stress to shear strain | |
| 149. |
If the Young's modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the material is |
| A. | -1 |
| B. | -0.5 |
| C. | 0.5 |
| D. | zero |
| Answer» D. zero | |
| 150. |
Limit of proportionality depends upon |
| A. | area of cross-section |
| B. | type of loading |
| C. | type of material |
| D. | all of the above |
| Answer» C. type of material | |
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