McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 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 | |
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