McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 351. |
The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is |
| A. | zero |
| B. | wl / 4 |
| C. | wl / 2 |
| D. | wl |
| Answer» A. zero | |
| 352. |
When a beam is subjected to bending moment, the stress at any point is |
| A. | equal to |
| B. | directly proportional to |
| C. | inversely proportional to |
| D. | independent of |
| Answer» B. directly proportional to | |
| 353. |
A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the |
| A. | top of the section |
| B. | bottom of the section |
| C. | neutral axis of the section |
| D. | junction of web and flange |
| Answer» C. neutral axis of the section | |
| 354. |
The planes, which carry no shear stress, are known as principal planes. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 355. |
A masonry dam may fail due to |
| A. | tension in the masonry of the dam and its base |
| B. | overturning of the dam |
| C. | crushing of masonry at the base of the dam |
| D. | any one of the above |
| Answer» D. any one of the above | |
| 356. |
A thin cylindrical shell of diameter (d) length (l) and thickness (t) is subjected to an internal pressure (p). The longitudinal stress in the shell is |
| A. | pd / t |
| B. | pd / 2t |
| C. | pd / 4t |
| D. | pd / 6t |
| Answer» C. pd / 4t | |
| 357. |
The proof resilience is the maximum strain energy which can be stored in a body |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 358. |
A pressure vessel is said to be a thin shell when it is made of thin sheets. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 359. |
The distance between the centres of rivets in adjacent rows of zig-zag riveted joint, is called back pitch. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 360. |
A cantilever beam is one which is |
| A. | fixed at both ends |
| B. | fixed at one end and free at the other end |
| C. | supported at its ends |
| D. | supported on more than two supports |
| Answer» B. fixed at one end and free at the other end | |
| 361. |
The buckling load for a given column depends upon |
| A. | area of cross-section of the column |
| B. | length and least radius of gyration of the column |
| C. | modulus of elasticity for the material of the column |
| D. | all of the above |
| Answer» D. all of the above | |
| 362. |
If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then |
| A. | the material A is more ductile than material B |
| B. | the material B is more ductile than material A |
| C. | the ductility of material A and B is equal |
| D. | the material A is brittle and material B is ductile |
| Answer» A. the material A is more ductile than material B | |
| 363. |
The springs in brakes and clutches are used to |
| A. | to apply forces |
| B. | to measure forces |
| C. | to store strain energy |
| D. | to absorb shocks |
| Answer» A. to apply forces | |
| 364. |
The maximum shear stress is |
| A. | equal to |
| B. | one-fourth |
| C. | one-half |
| D. | twice |
| Answer» C. one-half | |
| 365. |
When a column is subjected to an eccentric load, the stress induced in the column will be |
| A. | direct stress only |
| B. | bending stress only |
| C. | shear stress only |
| D. | direct and bending stress both |
| Answer» D. direct and bending stress both | |
| 366. |
In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress is always a tensile stress where as the radial stress is a compressive stress |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 367. |
The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is |
| A. | wl / 4 |
| B. | wl / 2 |
| C. | wl |
| D. | wl2 / 2 |
| Answer» D. wl2 / 2 | |
| 368. |
When a rectangular beam is loaded longitudinally, the shear force develops on the top layer. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 369. |
A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The hoop stress in the shell is |
| A. | pd / t |
| B. | pd / 2t |
| C. | pd / 4t |
| D. | pd / 6t |
| Answer» B. pd / 2t | |
| 370. |
A bar of copper and steel form a composite system, which is heated to a temperature of 40?C. The stress induced in the copper bar will be |
| A. | tensile |
| B. | compressive |
| C. | shear |
| D. | zero |
| Answer» B. compressive | |
| 371. |
When one plate overlaps the other and the two plates are riveted together with two rows of rivets, the joint is known as |
| A. | single riveted lap joint |
| B. | double riveted lap joint |
| C. | double riveted single cover butt joint |
| D. | double riveted double cover butt joint |
| Answer» B. double riveted lap joint | |
| 372. |
A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be |
| A. | 400 MPa |
| B. | 500 MPa |
| C. | 900 MPa |
| D. | 1400 MPa |
| Answer» D. 1400 MPa | |
| 373. |
A leaf spring is supported at the |
| A. | ends and loaded at the centre |
| B. | centre and loaded at the ends |
| C. | ends and loaded anywhere |
| D. | centre and loaded anywhere |
| Answer» B. centre and loaded at the ends | |
| 374. |
In a simple bending of beams, the stress in the beam varies |
| A. | linearly |
| B. | parabolically |
| C. | hyperbolically |
| D. | elliptically |
| Answer» A. linearly | |
| 375. |
The unit of stress in S.I. units is |
| A. | N / mm2 |
| B. | kN / mm2 |
| C. | N / m2 |
| D. | any one of these |
| Answer» D. any one of these | |
| 376. |
In a simply supported beam carrying a uniformly distributed load w per unit length, the point of contraflexure |
| A. | lies in the centre of the beam |
| B. | lies at the ends of the beam |
| C. | depends upon the length of beam |
| D. | does not exist |
| Answer» D. does not exist | |
| 377. |
When a rectangular beam is loaded transversely, the maximum tensile stress is developed on the |
| A. | top layer |
| B. | bottom layer |
| C. | neutral axis |
| D. | every cross-section |
| Answer» A. top layer | |
| 378. |
The unit of Young's modulus is same as that of stress. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 379. |
The deformation per unit length is called |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | strain |
| Answer» D. strain | |
| 380. |
In case of eccentrically loaded struts |
| A. | solid section |
| B. | hollow section |
| C. | composite section |
| D. | reinforced section |
| Answer» C. composite section | |
| 381. |
The compression test is carried on |
| A. | ductile |
| B. | brittle |
| C. | malleable |
| D. | plastic |
| Answer» B. brittle | |
| 382. |
The point of contraflexure occurs in |
| A. | cantilever beams |
| B. | simply supported beams |
| C. | overhanging beams |
| D. | fixed beams |
| Answer» C. overhanging beams | |
| 383. |
The shear force at a certain point on a beam changes sign form +ve value to -ve value or vice versa. The bending moment at that point will be zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 384. |
When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is |
| A. | tensile stress, tensile strain |
| B. | compressive stress, compressive strain |
| C. | shear stress, tensile strain |
| D. | shear stress, shear strain |
| Answer» D. shear stress, shear strain | |
| 385. |
The formation of the bar per unit length in the direction of the force is known as |
| A. | linear strain |
| B. | lateral strain |
| C. | volumetric strain |
| D. | whear strain |
| Answer» A. linear strain | |
| 386. |
In a beam where shear force changes sign, the bending moment will be |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | infinity |
| Answer» C. maximum | |
| 387. |
When a change in length takes place, the strain is known as |
| A. | linear strain |
| B. | lateral strain |
| C. | volumetric strain |
| D. | shear strain |
| Answer» A. linear strain | |
| 388. |
The factor of safety is always more than unity. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 389. |
For long columns, the value of buckling load is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» B. less than | |
| 390. |
The capacity of a strained body for doing work on the removal of the straining force, is called |
| A. | strain energy |
| B. | resilience |
| C. | proof resilience |
| D. | impact energy |
| Answer» B. resilience | |
| 391. |
A body is subjected to a direct tensile stress of 300 Mpa in one plane accompanied by a simple shear stress of 200 Mpa. The maximum normal stress will be |
| A. | ? 100 MPa |
| B. | 250 MPa |
| C. | 300 MPa |
| D. | 400 MPa |
| Answer» D. 400 MPa | |
| 392. |
A beam which is fixed at one end and free at the other is called |
| A. | simply supported beam |
| B. | fixed beam |
| C. | overhanging beam |
| D. | cantilever beam |
| Answer» D. cantilever beam | |
| 393. |
The product of Young's modulus (E) and moment of inertia (I) is known as |
| A. | modulus of rigidity |
| B. | bulk modulus |
| C. | flexural rigidity |
| D. | torsional rigidity |
| Answer» C. flexural rigidity | |
| 394. |
The unit of modulus of elasticity is same as those of |
| A. | stress, strain and pressure |
| B. | stress, force and modulus of rigidity |
| C. | strain, force and pressure |
| D. | stress, pressure and modulus of rigidity |
| Answer» D. stress, pressure and modulus of rigidity | |
| 395. |
When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend its length, the stress and strain induced is |
| A. | compressive stress, tensile strain |
| B. | tensile stress, compressive strain |
| C. | tensile stress, tensile strain |
| D. | compressive stress, compressive strain |
| Answer» C. tensile stress, tensile strain | |
| 396. |
The total strain energy stored in a body is termed as |
| A. | resilience |
| B. | proof resilience |
| C. | impact energy |
| D. | modulus of resilience |
| Answer» A. resilience | |
| 397. |
The stiffness of a closely-coiled helical spring is |
| A. | directly |
| B. | inversely |
| Answer» B. inversely | |
| 398. |
For biaxial stress, the planes of maximum shear are at right angles to each other and are inclined at 45? to the principal planes. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 399. |
The perpendicular distance between the centre lines of the successive rows, is called pitch. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 400. |
In a thick cylindrical shell subjected to an internal pressure (p), the maximum radial stress at the inner surface of the shell is |
| A. | zero |
| B. | p (tensile) |
| C. | ? p (compressive) |
| D. | 2 p (tensile) |
| Answer» C. ? p (compressive) | |
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