McqMate
301. |
A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be |
A. | same |
B. | double |
C. | half |
D. | one-fourth |
Answer» B. double |
302. |
The deformation of a bar under its own weight is |
A. | equal to |
B. | half |
C. | double |
D. | quadruple |
Answer» B. half |
303. |
A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission's ratio of the bar in tension will be |
A. | equal to |
B. | less than |
C. | greater than |
Answer» A. equal to |
304. |
The breaking stress is |
A. | equal to |
B. | less than |
C. | greater than |
Answer» B. less than |
305. |
Modulus of rigidity may be defined as the ratio of |
A. | linear stress to lateral strain |
B. | lateral strain to linear strain |
C. | linear stress to linear strain |
D. | shear stress to shear strain |
Answer» D. shear stress to shear strain |
306. |
A simply supported beam 'A' of length l, breadth b, and depth d carries a central point load W. Another beam 'B' has the same length and depth but its breadth is doubled. The deflection of beam 'B' will be |
A. | one-fourth |
B. | one-half |
C. | double |
D. | four times |
Answer» B. one-half |
307. |
The limit of eccentricity for no tensile condition for a column of circular section of diameter |
A. | d / 4 |
B. | d / 8 |
C. | d / 12 |
D. | d / 16 |
Answer» B. d / 8 |
308. |
When a rectangular beam is loaded transversely, the zero stress is developed on the neutral axis. |
A. | True |
B. | False |
Answer» A. True |
309. |
For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to |
A. | one half |
B. | one-third |
C. | one-fourth |
D. | one-eight |
Answer» C. one-fourth |
310. |
A pressure vessel is said to be a thick shell, when |
A. | it is made of thick sheets |
B. | the internal pressure is very high |
C. | the ratio of wall thickness of the vessel to its diameter is less than 1 / 10 |
D. | the ratio of wall thickness of the vessel to its diameter is greater than 1 / 10 |
Answer» D. the ratio of wall thickness of the vessel to its diameter is greater than 1 / 10 |
311. |
A uniformly distributed load may be assumed to behave like a point load at the centre of gravity of the load for all sorts of calculations. |
A. | Right |
B. | Wrong |
Answer» A. Right |
312. |
A riveted joint may fail by |
A. | tearing of the plate at an edge |
B. | tearing of the plate across a row of rivets |
C. | shearing of rivets |
D. | any one of these |
Answer» D. any one of these |
313. |
A column that fails due to direct strss, is called |
A. | short column |
B. | long column |
C. | weak column |
D. | medium column |
Answer» A. short column |
314. |
The ultimate tensile stress for mild steel is |
A. | equal to |
B. | less than |
C. | more than |
Answer» C. more than |
315. |
A load which acts at a point on a beam is not called uniformly distributed load. |
A. | Agree |
B. | Disagree |
Answer» A. Agree |
316. |
Young's modulus may be defined as the ratio of |
A. | linear stress to lateral strain |
B. | lateral strain to linear strain |
C. | linear stress to linear strain |
D. | shear stress to shear strain |
Answer» C. linear stress to linear strain |
317. |
The thermal or temperature stress is a function of |
A. | increase in temperature |
B. | modulus of elasticity |
C. | coefficient of linear expansion |
D. | all of these |
Answer» D. all of these |
318. |
A section of beam is said to be in pure bending, if it is subjected to |
A. | constant bending moment and constant shear force |
B. | constant shear force and zero bending moment |
C. | constant bending moment and zero shear force |
D. | none of the above |
Answer» C. constant bending moment and zero shear force |
319. |
The rivets are made from ductile material. |
A. | Yes |
B. | No |
Answer» A. Yes |
320. |
When there is a sudden increase or decrease in shear force diagram between any two points, it indicates that there is a |
A. | point load at the two points |
B. | no loading between the two points |
C. | uniformly distributed load between the two points |
D. | uniformly varying load between the two points |
Answer» A. point load at the two points |
321. |
A double strap butt joint with equal straps is |
A. | always in single shear |
B. | always in double shear |
C. | either in single shear or double shear |
D. | none of these |
Answer» B. always in double shear |
322. |
The ratio of the largest load in a test to the original cross-sectional area of the test piece is called. |
A. | elastic limit |
B. | yield stress |
C. | ultimate stress |
D. | breaking stress |
Answer» C. ultimate stress |
323. |
Fatigue test is carried out for |
A. | stresses varying between two limits of equal value, but of opposite sign |
B. | stresses varying between two limits of unequal value, but of opposite sign |
C. | stresses varying between two limits of unequal value but of same sign |
D. | all of the above |
Answer» D. all of the above |
324. |
A spring used to absorb shocks and vibrations is |
A. | conical spring |
B. | torsion spring |
C. | leaf spring |
D. | disc spring |
Answer» C. leaf spring |
325. |
The neutral axis of a beam is subjected to |
A. | zero |
B. | maximum tensile |
C. | minimum tensile |
D. | maximum compressive |
Answer» A. zero |
326. |
When a bar is cooled to -5?C, it will develop |
A. | no stress |
B. | shear stress |
C. | tensile stress |
D. | compressive stress |
Answer» C. tensile stress |
327. |
If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is |
A. | 0.2 |
B. | 0.3 |
C. | 0.5 |
D. | 0.6 |
Answer» C. 0.5 |
328. |
In case of an over-reinforced beam, the depth of actual neutral axis is the same as that of the critical neutral axis. |
A. | True |
B. | False |
Answer» B. False |
329. |
The bending moment diagram for a cantilever beam loaded with uniformly distributed load will be a parabolic curve. |
A. | Correct |
B. | Incorrect |
Answer» A. Correct |
330. |
The strain energy stored in a body, when suddenly loaded, is |
A. | equal to |
B. | one-half |
C. | twice |
D. | four times |
Answer» D. four times |
331. |
When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is compressive. |
A. | True |
B. | False |
Answer» A. True |
332. |
The neutral axis of the cross-section a beam is that axis at which the bending stress is |
A. | zero |
B. | minimum |
C. | maximum |
D. | infinity |
Answer» A. zero |
333. |
The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called |
A. | elastic limit |
B. | yield point |
C. | ultimate point |
D. | breaking point |
Answer» B. yield point |
334. |
The Young's modulus of a material is 125 Gpa and Poissons ratio is 0.25. The modulus of rigidity of the material is |
A. | 30 GPa |
B. | 50 GPa |
C. | 80 GPa |
D. | 100 GPa |
Answer» B. 50 GPa |
335. |
Euler's formula holds good only for |
A. | short column |
B. | long column |
C. | both short and long columns |
D. | weak columns |
Answer» B. long column |
336. |
A beam supported at its both ends is not a simply supported beam. |
A. | True |
B. | False |
Answer» B. False |
337. |
The shear force of a cantilever beam of length / carrying a uniformly distributed load of w per unit length is |
A. | zero |
B. | wl / 4 |
C. | wl / 2 |
D. | wl |
Answer» D. wl |
338. |
The shear force at the ends of a simply supported beam carrying a uniformly distributed load of w per unit length is |
A. | zero at its both ends |
B. | wl at one end and - wl at the other end |
C. | wl / 2 at one end and - wl / 2 at the other end |
D. | wl2 / 2 at one end and - wl2 / 2 at the other end |
Answer» C. wl / 2 at one end and - wl / 2 at the other end |
339. |
The shear force diagram for a cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is a |
A. | horizontal straight line |
B. | vertical straight line |
C. | inclined line |
D. | parabolic curve |
Answer» D. parabolic curve |
340. |
In a riveted joint, when the rivets in the adjacent rows are staggered in such a way that every rivet is in the middle of the two rivets of the opposite row, the joint is said to be diamond riveted. |
A. | Yes |
B. | No |
Answer» B. No |
341. |
The Rankine's formula holds good for |
A. | short columns |
B. | long columns |
C. | both short and long columns |
D. | weak columns |
Answer» C. both short and long columns |
342. |
The extremeties of any diameter on Mohr's circle represent |
A. | principal stresses |
B. | normal stresses on planes at 45? |
C. | shear stresses on planes at 45? |
D. | normal and shear stresses on a plane |
Answer» B. normal stresses on planes at 45? |
343. |
The Poisson's ratio for cast iron varies from |
A. | 0.23 to 0.27 |
B. | 0.25 to 0.33 |
C. | 0.31 to 0.34 |
D. | 0.32 to 0.42 |
Answer» B. 0.25 to 0.33 |
344. |
The centre to centre distance, between two consecutive rivets in a row, is called |
A. | margin |
B. | pitch |
C. | back pitch |
D. | diagonal pitch |
Answer» B. pitch |
345. |
The load at which the column just buckles, is known as |
A. | buckling load |
B. | critical load |
C. | crippling load |
D. | any one of these |
Answer» D. any one of these |
346. |
In a watch, the spring is used to store strain energy. This energy is released |
A. | to stop the watch |
B. | to run the watch |
C. | to change the time |
D. | all of these |
Answer» B. to run the watch |
347. |
The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as |
A. | bending moment |
B. | twisting moment |
C. | torsional rigidity |
D. | flexural rigidity |
Answer» B. twisting moment |
348. |
If the modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the material is equal to zero. |
A. | Correct |
B. | Incorrect |
Answer» A. Correct |
349. |
The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of |
A. | one right angled triangle |
B. | two right angled triangles |
C. | one equilateral triangle |
D. | two equilateral triangles |
Answer» B. two right angled triangles |
350. |
The columns whose slenderness ratio is less than 80, are known as |
A. | short column |
B. | long column |
C. | weak column |
D. | medium column |
Answer» A. short column |
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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