McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 201. |
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» C. 0.011 d | |
| 202. |
A beam of overall length / rests on two simple supports with equal overhangs on both sides. Two equal loads act at the free ends. If the deflection at the centre of the beam is the same as at either end, then the length of either overhang is |
| A. | 0 152 1 |
| B. | 0.207 1 |
| C. | 0.252 1 |
| D. | 0.277 1 |
| Answer» A. 0 152 1 | |
| 203. |
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» A. deflection at D in the first case will be equal to the deflection at C in the second case | |
| 204. |
If the deflection at the free end of a uniformly loaded cantilever beam is 15mm and the slope of the deflection curve at the free end is 0.02 radian, then the length of the beam is |
| A. | 0.8 m |
| B. | lm |
| C. | 1.2 m |
| D. | 1.5m |
| Answer» B. lm | |
| 205. |
A cantilever beam carries a uniformly distributed load from fixed end to the centre of the beam in the first case and a uniformly distributed load of same inten¬sity from centre of the beam to the free end in the second case. The ratio of deflections in the two cases is |
| A. | 1/2 |
| B. | 3/11 |
| C. | 5/24 |
| D. | 7/41 |
| Answer» D. 7/41 | |
| 206. |
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» C. eight times | |
| 207. |
A simply supported beam with rectangular cross-section is subjected to a central concentrated load. If the width and depth of the beam are doubled, then the deflection at the centre of the beam will be reduced to |
| A. | 50% |
| B. | 25% |
| C. | 12.5% |
| D. | 6.25% |
| Answer» D. 6.25% | |
| 208. |
A laminated spring is given an initial curvature because |
| A. | it is more economical |
| B. | it gives uniform strength |
| C. | spring becomes flat when it is subjec-ted to design load |
| D. | none of the above |
| Answer» C. spring becomes flat when it is subjec-ted to design load | |
| 209. |
A laminated spring is supported at |
| A. | ends and loaded at centre |
| B. | centre and loaded at ends |
| C. | ends and loaded anywhere |
| D. | centre and loaded anywhere |
| Answer» B. centre and loaded at ends | |
| 210. |
Laminated springs are subjected to |
| A. | direct stress |
| B. | bending stress |
| C. | shear stress |
| D. | none of the above |
| Answer» B. bending stress | |
| 211. |
Deflection in a leaf spring is more if its |
| A. | strength is more |
| B. | strength is less |
| C. | stiffness is less |
| D. | stiffness is more |
| Answer» C. stiffness is less | |
| 212. |
Buckling load for a given column depends upon |
| A. | length of column only |
| B. | least lateral dimension only |
| C. | both length and least lateral dimension |
| D. | none of the above |
| Answer» C. both length and least lateral dimension | |
| 213. |
When both ends of a column are fixed, the crippling load is P. If one end of the column is made free, the value of crippling load will be changed to |
| A. | P/16 |
| B. | P/4 |
| C. | P/2 |
| D. | 4P |
| Answer» A. P/16 | |
| 214. |
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» B. less than 80 | |
| 215. |
A long column has maximum crippling load when its |
| A. | both ends are hinged |
| B. | both ends are fixed |
| C. | one end is fixed and other end is hinged |
| D. | one end is fixed and other end is free |
| Answer» B. both ends are fixed | |
| 216. |
Effective length of a chimney of 20 m height is taken as |
| A. | 10 m |
| B. | 20m |
| C. | 28.28m |
| D. | 40m |
| Answer» D. 40m | |
| 217. |
Rankine's formula for column is valid when slenderness ratio |
| A. | lies between 0 and 140 |
| B. | lies between 0 and 100 |
| C. | is less than 80 |
| D. | has any value |
| Answer» D. has any value | |
| 218. |
Slenderness ratio of a 5 m long column hinged at both ends and having a circular crosssection with diameter 160 mm is |
| A. | 31.25 |
| B. | 62.5 |
| C. | 100 |
| D. | 125 |
| Answer» D. 125 | |
| 219. |
The effect of arching a beam is |
| A. | to reduce bending moment throughout |
| B. | to increase bending moment throughout |
| C. | to increase shear force |
| D. | to decrease shear force |
| Answer» A. to reduce bending moment throughout | |
| 220. |
Internal forces at every cross-section in a arch are |
| A. | nornal thrust and shear force |
| B. | shear force and bending moment |
| C. | normal thrust and bending moment |
| D. | normal thrust, shear force and bending moment |
| Answer» D. normal thrust, shear force and bending moment | |
| 221. |
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» A. bending moment | |
| 222. |
Due to rise in temperature in a three hinged arch, induced stress is |
| A. | direct compressive |
| B. | direct tensile |
| C. | shear |
| D. | none of the above |
| Answer» D. none of the above | |
| 223. |
In a three hinged arch, the linear and the actual arch meet at |
| A. | at least three points |
| B. | at least two points |
| C. | all points irrespective of loading |
| D. | nowhere |
| Answer» A. at least three points | |
| 224. |
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» A. normal thrust only | |
| 225. |
Three hinged arch is |
| A. | statically indeterminate by one degree |
| B. | statically indeterminate by two degrees |
| C. | statically determinate |
| D. | unstable structure |
| Answer» C. statically determinate | |
| 226. |
A linear arch has |
| A. | normal thrust only |
| B. | shear force only |
| C. | bending moment only |
| D. | normal thrust and shear force |
| Answer» A. normal thrust only | |
| 227. |
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» B. parabolic | |
| 228. |
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» A. m = 2j - 3 | |
| 229. |
The basic perfect frame is a |
| A. | triangle |
| B. | rectangle |
| C. | square |
| D. | hexagon |
| Answer» A. triangle | |
| 230. |
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» B. two | |
| 231. |
A short column of external diameter of 250 mm and internal diameter of 150 mm carries an eccentric load of 1000 kN. The greatest eccentricity which the load can have without producing tension anywhere is |
| A. | 20 mm |
| B. | 31.25 mm |
| C. | 37.5 mm |
| D. | 42.5 mm |
| Answer» D. 42.5 mm | |
| 232. |
Proof resilience is the maximum energy stored at |
| A. | limit of proportionality |
| B. | elastic limit |
| C. | plastic limit |
| D. | none of the above |
| Answer» B. elastic limit | |
| 233. |
Strain energy stored in a member is given by |
| A. | 0.5 x stress x volume |
| B. | 0.5 x strain x volume |
| C. | 0.5 x stress x strain x volume |
| D. | 0.5 x stress x strain |
| Answer» C. 0.5 x stress x strain x volume | |
| 234. |
A rectangular block of size 200 mm x 100 mm x 50 mm is subjected to a shear stress of 100 N/mm2. If modulus of rigidity of material is 1 x 105 N/mm2, strain energy stored will be |
| A. | 10 N.m |
| B. | 25 N.m |
| C. | 50 N.m |
| D. | 100N.m |
| Answer» C. 50 N.m | |
| 235. |
A steel rod of cross sectional area equal to 1000 mm2 is 5 m long. If a pull of 100 kN is suddenly applied to it, then the maximum stress intensity will be |
| A. | 50 N/mm2 |
| B. | 100 N/mm2 |
| C. | 200 N/mm2 |
| D. | 400 N/mm2 |
| Answer» C. 200 N/mm2 | |
| 236. |
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» D. 8 times | |
| 237. |
The specimen in a Charpy impact test is supported as a |
| A. | cantilever beam |
| B. | simply supported beam |
| C. | fixed beam |
| D. | continuous beam |
| Answer» B. simply supported beam | |
| 238. |
Impact test enables one to estimate the property of |
| A. | hardness |
| B. | toughness |
| C. | strength |
| D. | creep |
| Answer» B. toughness | |
| 239. |
A fletched beam is used to |
| A. | Change the shape of the beam |
| B. | Effect the saving in material |
| C. | Equalize the strength in tension and compression |
| D. | Increase the cross-section of the beam |
| Answer» C. Equalize the strength in tension and compression | |
| 240. |
The property of metal which allows it to deform continuously at slow rate without any further increase in stress is known as |
| A. | fatigue |
| B. | creep |
| C. | plasticity |
| D. | resilience |
| Answer» B. creep | |
| 241. |
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» B. elastic limit | |
| 242. |
A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will |
| A. | increase definitely |
| B. | decrease definitely |
| C. | be difficult to predict |
| D. | increase or decrease depending upon the radius of the segmental arch |
| Answer» B. decrease definitely | |
| 243. |
For ductile materials, the most appropriate failure theory is |
| A. | maximum shear stress theory |
| B. | maximum principal stress theory |
| C. | maximum principal strain theory |
| D. | shear strain energy theory |
| Answer» A. maximum shear stress theory | |
| 244. |
At a point in a steel member, the major principal stress is 2000 kg/cm2 and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500 kg/cm2, then the magnitude of the minor principal stress at which yielding will commence, according to the maximum shearing stress theory, is |
| A. | 1000 kg/cm2 |
| B. | 2000 kg/cm2 |
| C. | 2500 kg/cm2 |
| D. | 500 kg/cm2 |
| Answer» D. 500 kg/cm2 | |
| 245. |
For the design of a cast iron member, the most appropriate theory of failure is |
| A. | Mohr's theory |
| B. | Rankine's theory |
| C. | Maximum strain theory |
| D. | Maximum shear energy theory |
| Answer» B. Rankine's theory | |
| 246. |
In a riveted joint, when the rivets in the various rows are opposite to each other, the joint is said to be |
| A. | chain riveted |
| B. | zig-zag riveted |
| C. | diamond riveted |
| D. | none of these |
| Answer» A. chain riveted | |
| 247. |
Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is |
| A. | 1 ? 6 |
| B. | 1 ? 8 |
| C. | 1 ? 4 |
| D. | 15 ? 16 |
| Answer» D. 15 ? 16 | |
| 248. |
The ratio of change in volume to the original volume is called |
| A. | linear strain |
| B. | lateral strain |
| C. | volumetric strain |
| D. | Poisson's ratio |
| Answer» C. volumetric strain | |
| 249. |
The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be |
| A. | 1 ?3 |
| B. | 2 ? 3 |
| C. | 1 |
| D. | 3 ? 2 |
| Answer» B. 2 ? 3 | |
| 250. |
If the section modulus of a beam is increased, the bending stress in the beam will |
| A. | not change |
| B. | increase |
| C. | decrease |
| Answer» C. decrease | |
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