McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 251. |
A body is subjected to two normal stresses 20 kN / m2 (tensile) and 10 kN / m2 (compressive) acting perpendicular to each other. The maximum shear stress is |
| A. | 5 kN / m2 |
| B. | 10 kN / m2 |
| C. | 15 kN / m2 |
| D. | 20 kN / m2 |
| Answer» C. 15 kN / m2 | |
| 252. |
In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least |
| A. | equal to |
| B. | 1.5 times |
| C. | double |
| D. | 2.5 times |
| Answer» B. 1.5 times | |
| 253. |
In a beam of uniform strength, the bending stress developed is constant and is equal to the allowable stress at every section of the beam. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 254. |
The rectrangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam B will be |
| A. | same |
| B. | double |
| C. | four times |
| D. | six times |
| Answer» B. double | |
| 255. |
A rod is enclosed centrally in a tube and the assembly is lightened by rigid washers. If the assembly is subjected to a compressive load, then |
| A. | rod is under compression |
| B. | tube is under compression |
| C. | both rod and tube are under compression |
| D. | rube is under tension and rod is under compression |
| Answer» C. both rod and tube are under compression | |
| 256. |
The shear force in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length, is |
| A. | zero |
| B. | wl2 / 2 |
| C. | wl2 / 4 |
| D. | wl2 / 8 |
| Answer» A. zero | |
| 257. |
A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at |
| A. | apex of the triangle |
| B. | mid of the height |
| C. | centre of gravity of the triangle |
| D. | base of the triangle |
| Answer» B. mid of the height | |
| 258. |
The stress developed in the material without any permanent set is called |
| A. | elastic limit |
| B. | yield stress |
| C. | ultimate stress |
| D. | breaking stress |
| Answer» A. elastic limit | |
| 259. |
The ductility of a material |
| A. | increases |
| B. | decreases |
| C. | remains same |
| Answer» A. increases | |
| 260. |
The rectrangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be |
| A. | same |
| B. | double |
| C. | four times |
| D. | six times |
| Answer» C. four times | |
| 261. |
A bar of length L metres extends by l mm under a tensile force of P. The strain produced in the bar is |
| A. | l / L |
| B. | 0.1 l / L |
| C. | 0.01 l / L |
| D. | 0.001 l / L |
| Answer» D. 0.001 l / L | |
| 262. |
In the Euler's formula, the value of C for a column with one end fixed and the other end free, is |
| A. | 1 ? 2 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 263. |
The maximum stress produced in a bar of tapering section is at |
| A. | smaller end |
| B. | larger end |
| C. | middle |
| D. | anywhere |
| Answer» A. smaller end | |
| 264. |
In a thin cylindrical shell subjected to an internal pressure p, the ratio of longitudinal stress to the hoop stress is |
| A. | 1 ? 2 |
| B. | 3 ? 4 |
| C. | 1 |
| D. | 1.5 |
| Answer» A. 1 ? 2 | |
| 265. |
When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal |
| A. | polar moment of inertia |
| B. | polar modulus |
| C. | diameter |
| D. | angle of twist |
| Answer» B. polar modulus | |
| 266. |
In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the |
| A. | normal stress remains constant in all directions |
| B. | normal stress varies linearly in the material |
| C. | elastic constants are same in all the directions |
| D. | elastic constants varies linearly in the material |
| Answer» C. elastic constants are same in all the directions | |
| 267. |
For the two shafts connected in parallel and sub-jected to twisting moment, the angle of twist of each shaft will be same. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 268. |
A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test was |
| A. | mild steel |
| B. | cast iron |
| C. | glass |
| D. | copper |
| Answer» B. cast iron | |
| 269. |
The compressive strength of brittle materials is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 270. |
Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 271. |
A welded joint as compared to a riveted joint has |
| A. | same |
| B. | less |
| C. | more |
| Answer» C. more | |
| 272. |
The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is |
| A. | zero |
| B. | wl / 4 |
| C. | wl / 2 |
| D. | wl |
| Answer» A. zero | |
| 273. |
The bending moment at a point on a beam is the algebraic |
| A. | sum |
| B. | difference |
| Answer» A. sum | |
| 274. |
In the Euler's formula, the value of C for a column with one end fixed and the other end hinged, is 1 / 2. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 275. |
The bending moment diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, will be |
| A. | a horizontal line |
| B. | a vertical line |
| C. | an inclined line |
| D. | a parabolic curve |
| Answer» D. a parabolic curve | |
| 276. |
Every direct stress is always accompanied by a strain in its own direction and an opposite kind of strain in every direction, at right angles to it. Such a strain is known as |
| A. | linear strain |
| B. | lateral strain |
| C. | volumetric strain |
| D. | shear strain |
| Answer» B. lateral strain | |
| 277. |
The bending stress in a beam is |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | directly proportional to |
| Answer» D. directly proportional to | |
| 278. |
The section nodulus (Z) of a beam is given by |
| A. | I / y |
| B. | I.y |
| C. | y / I |
| D. | M / I |
| Answer» A. I / y | |
| 279. |
According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end free is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» B. less than | |
| 280. |
A shear stress across a plane, is always accompanied by a balancing shear stress across the plane and normal to it. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 281. |
Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B'. The ratio of deflections in spring 'A' to spring 'B' is |
| A. | 1 ? 8 |
| B. | 1 ? 4 |
| C. | 1 ? 2 |
| D. | 2 |
| Answer» C. 1 ? 2 | |
| 282. |
A lap joint is always in |
| A. | single |
| B. | double |
| Answer» A. single | |
| 283. |
The shear force and bending moment zre zero at the free end of a cantilever beam, if it carries a |
| A. | point load at the free end |
| B. | point load at the middle of its length |
| C. | uniformly distributed load over the whole length |
| D. | none of the above |
| Answer» C. uniformly distributed load over the whole length | |
| 284. |
In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of a cylinder is |
| A. | maximum at the outer surface and minimum at the inner surface |
| B. | maximum at the inner surface and minimum at the outer surface |
| C. | maximum at the outer surface and zero at the inner surface |
| D. | maximum at the inner surface and zero at the outer surface |
| Answer» D. maximum at the inner surface and zero at the outer surface | |
| 285. |
The forsional rigidity of a shaft is given by |
| A. | T / J |
| B. | T / ? |
| C. | T / r |
| D. | T / G |
| Answer» B. T / ? | |
| 286. |
In a tensile test, when the material is stressed beyond elastic limit, the tensile strain |
| A. | decreases slowly |
| B. | increases slowly |
| C. | decreases more quickly |
| D. | increases more quickly |
| Answer» D. increases more quickly | |
| 287. |
Within elastic limit, shear stress is |
| A. | equal to |
| B. | less than |
| C. | directly proportional to |
| D. | inversely proportional to |
| Answer» C. directly proportional to | |
| 288. |
A cantilever beam of length / carries a gradually varying load from zero at free end and w per unit length at the fixed end. The maximum deflection oes at |
| A. | free end |
| B. | fixed end |
| C. | mid-span |
| Answer» A. free end | |
| 289. |
The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is |
| A. | 2 ? 3 |
| B. | 3 ? 4 |
| C. | one |
| D. | 9 ? 8 |
| Answer» D. 9 ? 8 | |
| 290. |
The rivets are used for |
| A. | permanent |
| B. | temporary |
| Answer» A. permanent | |
| 291. |
The maximum deflection of a fixed beam carrying a central point load lies at |
| A. | fixed ends |
| B. | centre of beam |
| C. | l / 3 from fixed ends |
| D. | none of these |
| Answer» B. centre of beam | |
| 292. |
Hook's law holds good up to |
| A. | yield point |
| B. | elastic limit |
| C. | plastic limit |
| D. | breaking point |
| Answer» B. elastic limit | |
| 293. |
At the neutral axis of a beam, the shear stress is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | infinity |
| Answer» C. maximum | |
| 294. |
The bending moment on a section is maximum where shear force is |
| A. | minimum |
| B. | maximum |
| C. | changing sign |
| D. | zero |
| Answer» C. changing sign | |
| 295. |
In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress across the thickness of a cylinder is |
| A. | maximum at the outer surface and minimum at the inner surface |
| B. | maximum at the inner surface and minimum at the outer surface |
| C. | maximum at the outer surface and zero at the inner surface |
| D. | maximum at the inner surface and zero at the outer surface |
| Answer» B. maximum at the inner surface and minimum at the outer surface | |
| 296. |
The shear modulus of most materials with respect to the modulus of elasticity is |
| A. | equal to half |
| B. | less than half |
| C. | more than half |
| D. | none of these |
| Answer» B. less than half | |
| 297. |
The maximum shear stress developed in a beam of rectangular section is |
| A. | equal to |
| B. | 4 / 3 time |
| C. | 1.5 times |
| D. | twice |
| Answer» C. 1.5 times | |
| 298. |
The maximum shear stress of a beam of triangular section occurs above the neutral axis. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 299. |
Which of the following is a proper sequence? |
| A. | proportional limit, elastic limit, yielding, failure |
| B. | elastic limit, proportional limit, yielding, failure |
| C. | yielding, proportional limit, elastic limit, failure |
| D. | none of the above |
| Answer» A. proportional limit, elastic limit, yielding, failure | |
| 300. |
Parallel fillet welds are designed for bending strength. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
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