MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 134 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
A strip of steel (E = 200 GPa, 0.25) has a length of 1 m, width of200 mm and thickness of 10 mm. A line of length 1 m is drawn parallel to its length on one of its side surfaces. When the strip is subjected to an axial tensile force of100 kN, the length of the line will be mm. |
| A. | 1000 |
| B. | 1000.25 |
| C. | 999.25 |
| D. | 0.25 |
| Answer» C. 999.25 | |
| 102. |
If all the dimensions of a prismatic bar are doubled, then the maximum stress produced in it under its own weight will |
| A. | decrease |
| B. | remain unchanged |
| C. | increase to two times |
| D. | increase to four times |
| Answer» D. increase to four times | |
| 103. |
For an isotropic, homogeneous and elastic material obeying Hooke's law, number of independent elastic constants is |
| A. | 2 |
| B. | 3 |
| C. | 9 |
| D. | 1 |
| Answer» B. 3 | |
| 104. |
The relationship between Young's, modulus of elasticity E, bulk modulus K and Poisson's ratio u is given by |
| A. | E = 2K(l-2u.) |
| B. | E = 3K(l + u) |
| C. | E = 3K(l-2u) |
| D. | E = 2K(l + u) |
| Answer» D. E = 2K(l + u) | |
| 105. |
A cantilever beam AB of length 1 carries a concentrated load W at its midspan C. If the free end B is supported on a rigid prop, then there is a point of contraflexure |
| A. | between A and C |
| B. | between C and B |
| C. | one between A and C and other between C and B |
| D. | nowhere in the beam |
| Answer» B. between C and B | |
| 106. |
Of the several prismatic beams of equal lengths, the strongest in flexure is the one having maximum |
| A. | moment of inertia |
| B. | section modulus |
| C. | tensile strength |
| D. | area of cross-section |
| Answer» C. tensile strength | |
| 107. |
The stress below which a material has a high probability of not failing under reversal of stress is known as |
| A. | tolerance limit |
| B. | elastic limit |
| C. | proportional limit |
| D. | endurance limit |
| Answer» C. proportional limit | |
| 108. |
According to Unwin's formula, the dia meter of rivet in mm to suit the t mm thickness of plate is given by |
| A. | 6t |
| B. | 6Vt |
| C. | 1.9-y/t |
| D. | 1.5 t+ 4 |
| Answer» C. 1.9-y/t | |
| 109. |
At a point in a strained body carrying two unequal unlike principal stresses pi and p2 (Pi > P2X the maximum shear stress is given by |
| A. | p,/2 |
| B. | p2/2 |
| C. | (p,-p2)/2 |
| D. | (p, + p2)/2 |
| Answer» E. | |
| 110. |
If the rivet value is 16.8 kN and force in the member is 16.3 kN, then the number of rivets required for the connection of the member to a gusset plate is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 111. |
The ratio between change in volume to original volume of body is called strain. |
| A. | tensile |
| B. | compressive |
| C. | shear |
| D. | volumetric |
| Answer» E. | |
| 112. |
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» B. indirectly | |
| 113. |
.Strain is the deformation of the bar per unit length in the direction of force. |
| A. | volumetric |
| B. | shear |
| C. | lateral |
| D. | linear |
| Answer» E. | |
| 114. |
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» C. bending | |
| 115. |
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» E. | |
| 116. |
The elongation of circular tapered rod is given by . Where P=axial pull and d1, d2= diameters at two ends. |
| A. | 4pl/ ed1d2 |
| B. | 2pl/ ed1d2 |
| C. | 4pl/ed1d2 |
| D. | 4p2l/ed1d2 |
| Answer» B. 2pl/ ed1d2 | |
| 117. |
A tensile material is having Young s modulus 2.1 x105 N/mm2 and modulus of Rigidity is 0.82 x105 N/mm2. The value of Bulk Modulus is .. |
| A. | 1.4 x105 n/mm2 |
| B. | 1.6 x105 n/mm2 |
| C. | 1.81 x105 n/mm2 |
| D. | 1.5 x105 n/mm2 |
| Answer» C. 1.81 x105 n/mm2 | |
| 118. |
A steel rod of length is manufactured at a temperature 200C and its temperature increases upto 1350C.What are thermal stresses induced? E=200Gpa, =12*10-6/0C |
| A. | 312mpa |
| B. | 310mpa |
| C. | 320mpa |
| D. | 276mpa |
| Answer» E. | |
| 119. |
For a determinate pin-jointed plane frame, the relation between the number of joints j and members m is given by |
| A. | m = 2j - 3 |
| B. | m = 3j-6 |
| C. | m > 2j - 3 |
| D. | m > 3j - 6 |
| Answer» B. m = 3j-6 | |
| 120. |
Method of joints is applicable only when the number of unknown forces at the joint under consideration is not more than |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 121. |
A beam ABC rests on simple supports at A and B with BC as an overhang. D is centre of span AB. If in the first case a concentrated load P acts at C while in the second case load P acts at D, then the |
| A. | deflection at D in the first case will be equal to the deflection at C in the second case |
| B. | deflection at C in the first case is equal to the deflection at D in the second case |
| C. | deflection at D in the first case will always be smaller than the deflection at C in the second case |
| D. | deflection at D in the first case will always be greater than the deflection at C in the second case |
| Answer» B. deflection at C in the first case is equal to the deflection at D in the second case | |
| 122. |
If the length of a simply supported beam carrying a concentrated load at the centre is doubled, the defection at the centre will become |
| A. | two times |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» D. sixteen times | |
| 123. |
If the depth of a beam of rectangular section is reduced to half, strain energy stored in the beam becomes |
| A. | 1/4 time |
| B. | 1/8 time |
| C. | 4 times |
| D. | 8 times |
| Answer» E. | |
| 124. |
The portion, which should be removed from top and bottom of a circular cross section of diameter d in order to obtain maximum section modulus, is |
| A. | 0.01 d |
| B. | 0.1 d |
| C. | 0.011 d |
| D. | 0.11 d |
| Answer» D. 0.11 d | |
| 125. |
A prismatic beam of length 1 and fixed at both ends carries a uniformly distributed load. The distance of points of contraflexure from either end is |
| A. | 0.2071 |
| B. | 0.2111 |
| C. | 0.2771 |
| D. | 0.251 |
| Answer» C. 0.2771 | |
| 126. |
If a three hinged parabolic arch carries a uniformly distributed load over the entire span, then any section of the arch is subjected to |
| A. | normal thrust only |
| B. | normal thrust and shear force |
| C. | normal thrust and bending moment |
| D. | normal thrust, shear force and bending moment |
| Answer» B. normal thrust and shear force | |
| 127. |
Euler's formula for a mild steel long column hinged at both ends is not valid for slenderness ratio |
| A. | greater than 80 |
| B. | less than 80 |
| C. | greater than 180 |
| D. | greater than 120 |
| Answer» C. greater than 180 | |
| 128. |
According to Eddy's theorem, the vertical intercept between the linear arch and the centre line of actual arch at any point represents to some scale |
| A. | bending moment |
| B. | shear force |
| C. | normal thrust |
| D. | deflection |
| Answer» B. shear force | |
| 129. |
A three hinged arch is carrying uniformly distributed load over the entire span. The arch is free from shear force and bending moment if its shape is |
| A. | circular |
| B. | parabolic |
| C. | elliptical |
| D. | none of the above |
| Answer» C. elliptical | |
| 130. |
Two beams, one of circular cross-section and other of square cross-section, have equal areas of cross-section. If subjected to bending |
| A. | circular section is more economical |
| B. | square section is more economical |
| C. | both sections are equally strong |
| D. | both sections are equally stiff |
| Answer» C. both sections are equally strong | |
| 131. |
A steel rod of 3m length is manufactured at 250C the temperature of this rod increases to 1250C. What is the free expansion? Take E=200Gpa, =12*10-6/0C,diameter=12mm |
| A. | 3.2mm |
| B. | 2.6mm |
| C. | 4mm |
| D. | 3.6mm |
| Answer» E. | |
| 132. |
If the member shown in Fig. 1.1 has a square cross section of 25 mm25 mm and E = 200 GPa, the change in length of portion AB is mm. |
| A. | 0.24 |
| B. | -0.24 |
| C. | 0.32 |
| D. | -0.32 |
| Answer» B. -0.24 | |
| 133. |
The factor of safety depends oni)Magnitude of external forceii) Properties of materialiii) Dimension of the componentiv) All of the above |
| A. | i) and ii) |
| B. | ii) and iii) |
| C. | i) , ii) and iii) |
| D. | iv |
| Answer» E. | |
| 134. |
The thermal stress is given by where = coeffeicient of linear expansion T = Rise in temperature |
| A. | e t |
| B. | et/ |
| C. | e /t |
| D. | 1/e t |
| Answer» B. et/ | |