McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 401. |
The springs in cars are used to store strain energy. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 402. |
Factor of safety is defined as the ratio of |
| A. | ultimate stress to working stress |
| B. | working stress to ultimate stress |
| C. | breaking stress to ultimate stress |
| D. | ultimate stress to breaking stress |
| Answer» A. ultimate stress to working stress | |
| 403. |
When a beam is subjected to a bending moment, the strain in a layer is |
| A. | equal to |
| B. | directly proportional to |
| C. | inversely proportional to |
| D. | independent of |
| Answer» B. directly proportional to | |
| 404. |
In the above question, the normal stress on an oblique section will be maximum, when ? is equal to |
| A. | 0? |
| B. | 30? |
| C. | 45? |
| D. | 90? |
| Answer» A. 0? | |
| 405. |
The Rankine's constant for a mild steel column with both ends hinged is |
| A. | 1 / 750 |
| B. | 1 / 1600 |
| C. | 1 ? 7500 |
| D. | 1 ? 9000 |
| Answer» C. 1 ? 7500 | |
| 406. |
A tensile test is performed on a mild steel round bar. Its diameter after fracture will |
| A. | remain same |
| B. | increase |
| C. | decrease |
| D. | depend upon rate of loading |
| Answer» C. decrease | |
| 407. |
The hoop stress in a thick cylindrical shell is maximum at the inner radius. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 408. |
For riveting, the size of hole drilled in plates is |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 409. |
When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | bending stress |
| Answer» C. shear stress | |
| 410. |
The line of intersection of the neutral layer with any normal cross-section of the beam is called neutral axis. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 411. |
A reinforced cement concrete beam is considered to be made of |
| A. | homogeneous material |
| B. | hetrogeneous material |
| C. | composite material |
| D. | isotropic material |
| Answer» B. hetrogeneous material | |
| 412. |
The strength of the shaft is judged by the torque transmitted by the shaft. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 413. |
In a leaf spring the length of all the leaves are equal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 414. |
The ductility of the material |
| A. | increases |
| B. | decreases |
| C. | remains same |
| Answer» B. decreases | |
| 415. |
The ratio of linear stress to the linear strain is called |
| A. | modulus of rigidity |
| B. | modulus of elasticity |
| C. | bulk modulus |
| D. | Poisson's ratio |
| Answer» B. modulus of elasticity | |
| 416. |
The load required to produce a unit deflection in a spring is called |
| A. | flexural rigidity |
| B. | torsional rigidity |
| C. | spring stiffness |
| D. | Young's modulus |
| Answer» C. spring stiffness | |
| 417. |
When a thin cylindrical shell is subjected to an internal pressure, there will be |
| A. | a decrease in diameter and length of the shell |
| B. | an increase in diameter and decrease in length of the shell |
| C. | a decrease in diameter and increase in length of the shell |
| D. | an increase in diameter and length of the shell |
| Answer» D. an increase in diameter and length of the shell | |
| 418. |
The design of thin cylindrical shells is based on |
| A. | hoop stress |
| B. | longitudinal stress |
| C. | arithmetic mean of the hoop and the longitudinal stress |
| D. | geometric mean of the hoop and longitudinal stress |
| Answer» A. hoop stress | |
| 419. |
A column of length (l) with both ends fixed may be considered as equivalent to a column of length |
| A. | l / 8 |
| B. | l / 4 |
| C. | l / 2 |
| D. | l |
| Answer» C. l / 2 | |
| 420. |
Resilience is the |
| A. | energy stored in a body when strained within elastic limits |
| B. | energy stored in a body when strained upto the breaking of the specimen |
| C. | maximum strain energy which can be stored in a body |
| D. | none of the above |
| Answer» D. none of the above | |
| 421. |
Two closely-coiled helical springs 'A' and 'B' of the same material, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be |
| A. | 1 ? 8 |
| B. | 1 ? 4 |
| C. | 2 |
| D. | 4 |
| Answer» A. 1 ? 8 | |
| 422. |
The neutral axis of the symmetrical beam does not pass through the centroid of the beam. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 423. |
The maximum bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length lies at the middle of its length. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 424. |
A body is subjected to a direct tensile stress (?) in one plane. The shear stress is maximum at a section inclined at |
| A. | 45? and 90? |
| B. | 45? to 135? |
| C. | 60? and 150? |
| D. | 30? and 135? |
| Answer» B. 45? to 135? | |
| 425. |
A localised compressive stress at the area of contact between two members is known as |
| A. | tensile stress |
| B. | bending stress |
| C. | crushing stress |
| D. | shear stress |
| Answer» C. crushing stress | |
| 426. |
The shear stress at the outermost fibres of a circular shaft under torsion is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | infinity |
| Answer» C. maximum | |
| 427. |
A shaft of diameter D is subjected to a twisting moment (T) and a bending moment (M). If the maximum bending stress is equal to maximum shear stress developed, then M is equal to |
| A. | T / 2 |
| B. | T |
| C. | 2 T |
| D. | 4 T |
| Answer» A. T / 2 | |
| 428. |
Which of the following statement is correct? |
| A. | The size of hole drilled in riveting plates is less than the actual size of rivet. |
| B. | The centre to centre distance between two consecutive rivets in a row is called margin. |
| C. | Rivets are generally specified by its shank diameter |
| D. | Tearing of plates can be avoided by taking the pitch of rivets equal to 1.5 times the diameter of rivet hole. |
| Answer» C. Rivets are generally specified by its shank diameter | |
| 429. |
A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then |
| A. | bolt and tube are under tension |
| B. | bolt and tube are under compression |
| C. | bolt is under compression and tube is under tension |
| D. | bolt is under tension and tube is under compression |
| Answer» D. bolt is under tension and tube is under compression | |
| 430. |
The thermal stress |
| A. | depends |
| B. | does not depend |
| Answer» B. does not depend | |
| 431. |
When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | thermal stress |
| Answer» D. thermal stress | |
| 432. |
When a material is loaded within elastic limit, the material will regain its shape and size when the load is removed. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 433. |
When a bar of length l, width b and thickness t is subjected to a pull of P, its |
| A. | length, width and thickness increases |
| B. | length, width and thickness decreases |
| C. | length increases, width and thickness decreases |
| D. | length decreases, width and thickness increases |
| Answer» C. length increases, width and thickness decreases | |
| 434. |
A beam of uniform strength has |
| A. | same cross-section throughout the beam |
| B. | same bending stress at every section |
| C. | same bending moment at every section |
| D. | same shear stress at every section |
| Answer» B. same bending stress at every section | |
| 435. |
In the above question, the ratio of stiffness of spring 'B' to spring 'A' will be |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 436. |
A load which is spread over a beam in such a manner that it varies uniformly over the whole length of a beam is called uniformly |
| A. | distributed |
| B. | varying |
| Answer» B. varying | |
| 437. |
Which of the following statement is wrong? |
| A. | In the theory of simple bending, the assumption is that the plane sections before bending remains plane after bending. |
| B. | In a beam subjected to bending moment, the strain is directly proportional to the distance from te neutral axis. |
| C. | At the neutral axis of a beam, the bending stress is maximum |
| D. | The bending stress in a beam is inversely proportional to the section modulus |
| Answer» C. At the neutral axis of a beam, the bending stress is maximum | |
| 438. |
Which of the following statement is correct? |
| A. | A continuous beam has only two supports at the ends |
| B. | A uniformly distributed load spreads uniformly over the whole length of a beam. |
| C. | The bending moment is maximum where whear force is maximum. |
| D. | The maximum bending moment of a simply supported beam of length l with a central point load W is W l/8. |
| Answer» B. A uniformly distributed load spreads uniformly over the whole length of a beam. | |
| 439. |
A fixed beam is one which is fixed at |
| A. | One |
| B. | both |
| Answer» B. both | |
| 440. |
On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 441. |
If the magnitude of direct stress and bending stress is equal, then there will be zero stress at one of the extreme ends of a column. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 442. |
The ratio of the lateral strain to the linear strain is called |
| A. | modulus of elasticity |
| B. | modulus of rigidity |
| C. | bulk modulus |
| D. | Poisson's ratio |
| Answer» D. Poisson's ratio | |
| 443. |
The bending moment diagram for a cantilever beam of length l and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is a parabolic curve. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 444. |
A simply supported beam 'A' of length l, breadth b and depth d carries a central load W. Another beam 'B' of the same dimensions carries a central load equal to 2 W. The deflection of beam 'B' will be |
| A. | one-fourth |
| B. | one-half |
| C. | double |
| D. | four times |
| Answer» C. double | |
| 445. |
A simply supported beam 'A' of length l, breadth b and depth d carried a central point load W. Another bream 'B' has the same length and breadth but its depth is doubled. The deflection of beam 'B' will be double as compared to beam 'A'. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 446. |
A flitched beam is used to |
| A. | change the shape of the beam |
| B. | effect the saving in material |
| C. | equalise the strength in tension and compression |
| D. | increase the cross-section of the beam |
| Answer» C. equalise the strength in tension and compression | |
| 447. |
The volumetric strain is the ratio of the |
| A. | original thickness to the change in thickness |
| B. | change in thickness to the original thickness |
| C. | original volume to the change in volume |
| D. | change in volume to the original volume |
| Answer» D. change in volume to the original volume | |
| 448. |
A concentrated load is one which |
| A. | acts at a point on a beam |
| B. | spreads non-uniformly over the whole length of a beam |
| C. | spreads uniformly over the whole length of a beam |
| D. | varies uniformly over the whole length of a beam |
| Answer» A. acts at a point on a beam | |
| 449. |
A simply supported beam is one which is supported on more than two supports. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 450. |
For the above question, the minimum normal stress will be |
| A. | ? 100 MPa |
| B. | 250 MPa |
| C. | 300 MPa |
| D. | 400 MPa |
| Answer» A. ? 100 MPa | |
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