MCQOPTIONS
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MCQOPTIONS
This section includes 606 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
*/*_The mechanical advantage of a lifting machine is the ratio of? |
| A. | Distance moved by effort to the distance moved by load |
| B. | Load lifted to the effort applied |
| C. | Output to the input |
| D. | All of the above |
| Answer» C. Output to the input | |
| 352. |
%_Coulomb friction is the friction between_% |
| A. | Bodies having relative motion |
| B. | Two dry surfaces |
| C. | Two lubricated surfaces |
| D. | Solids and liquids |
| Answer» B. Two dry surfaces | |
| 353. |
%_Moment of inertia of a circular section about its diameter (d) is_% |
| A. | πd3/16 |
| B. | πd3/32 |
| C. | πd4/32 |
| D. | πd4/64 |
| Answer» E. | |
| 354. |
%_If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys._% |
| A. | First |
| B. | Second |
| C. | Third |
| D. | None of these |
| Answer» C. Third | |
| 355. |
%_Kinetic friction is the_% |
| A. | Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction |
| B. | Ratio of limiting friction and normal reaction |
| C. | The friction force acting when the body is just about to move |
| D. | The friction force acting when the body is in motion |
| Answer» E. | |
| 356. |
%_The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction.)_% |
| A. | α = 45° + φ/2 |
| B. | α = 45° - φ/2 |
| C. | α = 90° + φ |
| D. | α = 90° - φ |
| Answer» C. ≈í¬± = 90¬¨‚àû + ≈ì√ú | |
| 357. |
%_In actual machines_% |
| A. | Mechanical advantage is greater than velocity ratio |
| B. | Mechanical advantage is equal to velocity ratio |
| C. | Mechanical advantage is less than velocity ratio |
| D. | Mechanical advantage is unity |
| Answer» D. Mechanical advantage is unity | |
| 358. |
%_Angle of friction is the_% |
| A. | Angle between normal reaction and the resultant of normal reaction and the limiting friction |
| B. | Ratio of limiting friction and normal reaction |
| C. | The ratio of minimum friction force to the friction force acting when the body is just about to move |
| D. | The ratio of minimum friction force to friction force acting when the body is in motion |
| Answer» B. Ratio of limiting friction and normal reaction | |
| 359. |
%_The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is_% |
| A. | a = α/ r |
| B. | a = α.r |
| C. | a = r / α |
| D. | None of these |
| Answer» C. a = r / ≈í¬± | |
| 360. |
%_A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is_% |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 40 |
| Answer» C. 20 | |
| 361. |
%_The process of finding out the resultant force is called __________ of forces._% |
| A. | Composition |
| B. | Resolution |
| C. | Decomposition |
| D. | None of these |
| Answer» B. Resolution | |
| 362. |
%_The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then_% |
| A. | P = Q |
| B. | Q = R |
| C. | Q = 2R |
| D. | None of these |
| Answer» C. Q = 2R | |
| 363. |
%_Which of the following statement is correct?_% |
| A. | The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation |
| B. | The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity |
| C. | The velocity of the particle moving with simple harmonic motion is zero at the mean position |
| D. | The acceleration of the particle moving with simple harmonic motion is maximum at the mean position |
| Answer» B. The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity | |
| 364. |
%_Moment of inertia is the_% |
| A. | Second moment of force |
| B. | Second moment of area |
| C. | Second moment of mass |
| D. | All of these |
| Answer» E. | |
| 365. |
%_If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is_% |
| A. | 30° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» E. | |
| 366. |
%_Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then_% |
| A. | Their algebraic sum is zero |
| B. | Their lines of action are at equal distances |
| C. | The algebraic sum of their moments about any point in their plane is zero |
| D. | The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point |
| Answer» E. | |
| 367. |
%_If u‚ÇÅ and u‚ÇÇ are the velocities of two moving bodies in the same direction before impact and v‚ÇÅ and v‚ÇÇ are their velocities after impact, then coefficient of restitution is given by_% |
| A. | (v‚ÇÅ - v‚ÇÇ)/(u‚ÇÅ - u‚ÇÇ) |
| B. | (v‚ÇÇ - v‚ÇÅ)/(u‚ÇÅ - u‚ÇÇ) |
| C. | (u‚ÇÅ - u‚ÇÇ)/(v‚ÇÅ - v‚ÇÇ) |
| D. | (u‚ÇÇ + u‚ÇÅ)/(v‚ÇÇ + v‚ÇÅ) |
| Answer» C. (u‚Äö√á√Ö - u‚Äö√á√á)/(v‚Äö√á√Ö - v‚Äö√á√á) | |
| 368. |
%_The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be_% |
| A. | L/2 |
| B. | L/3 |
| C. | 3L/4 |
| D. | 2L/3 |
| Answer» E. | |
| 369. |
%_If a body is acted upon by a number of coplanar non-concurrent forces, it may_% |
| A. | Rotate about itself without moving |
| B. | Move in any one direction rotating about itself |
| C. | Be completely at rest |
| D. | All of these |
| Answer» E. | |
| 370. |
%_The velocity of a particle moving with simple harmonic motion is _________ at the mean position._% |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of these |
| Answer» D. None of these | |
| 371. |
%_The total energy possessed by a system of moving bodies_% |
| A. | Is constant at every instant |
| B. | Varies from point to point |
| C. | Is maximum in the start and minimum at the end |
| D. | Is minimum in the start and maximum at the end |
| Answer» B. Varies from point to point | |
| 372. |
_ The forces, whose lines of action are parallel to each other and act in the same directions, are known as$? |
| A. | Coplanar concurrent forces |
| B. | Coplanar non-concurrent forces |
| C. | Like parallel forces |
| D. | Unlike parallel forces |
| Answer» D. Unlike parallel forces | |
| 373. |
_ The mechanical advantage of a lifting machine is the ratio of$? |
| A. | Distance moved by effort to the distance moved by load |
| B. | Load lifted to the effort applied |
| C. | Output to the input |
| D. | All of the above |
| Answer» C. Output to the input | |
| 374. |
_ The coefficient of friction depends upon$? |
| A. | Nature of surfaces |
| B. | Area of contact |
| C. | Shape of the surfaces |
| D. | All of the above |
| Answer» B. Area of contact | |
| 375. |
_ The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» B. Less than | |
| 376. |
_ According to Lami’s theorem$? |
| A. | The three forces must be equal |
| B. | The three forces must be at 120° to each other |
| C. | The three forces must be in equilibrium |
| D. | If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two |
| Answer» E. | |
| 377. |
_ A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if$? |
| A. | The floor is smooth, the wall is rough |
| B. | The floor is rough, the wall is smooth |
| C. | The floor and wall both are smooth surfaces |
| D. | The floor and wall both are rough surfaces |
| Answer» D. The floor and wall both are rough surfaces | |
| 378. |
_ If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be$? |
| A. | Same |
| B. | Half |
| C. | Double |
| D. | None of these |
| Answer» C. Double | |
| 379. |
_ The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be$? |
| A. | 20 kg, -ve sense |
| B. | 20 kg, + ve sense |
| C. | 10 kg, + ve sense |
| D. | 10 kg, -ve sense |
| Answer» B. 20 kg, + ve sense | |
| 380. |
_ The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is$? |
| A. | 9 cm4 |
| B. | 12 cm4 |
| C. | 16 cm4 |
| D. | 20 cm4 |
| Answer» D. 20 cm4 | |
| 381. |
_ The C.G. of a right circular solid cone of height h lies at the following distance from the base$? |
| A. | h/2 |
| B. | J/3 |
| C. | h/6 |
| D. | h/4 |
| Answer» E. | |
| 382. |
_ Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to$? |
| A. | Area of the triangle |
| B. | Twice the area of the triangle |
| C. | Half the area of the triangle |
| D. | None of these |
| Answer» C. Half the area of the triangle | |
| 383. |
_ If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.$? |
| A. | Change |
| B. | Does not change |
| C. | Changes periodically |
| D. | None of these |
| Answer» C. Changes periodically | |
| 384. |
_ Two bodies of masses m‚ÇÅ and m‚ÇÇ are hung from the ends of a rope, passing over a frictionless pulley as shown in the figure below. The acceleration of the string will be Engineering Mechanics$? |
| A. | g (m‚ÇÅ - m‚ÇÇ)/(m‚ÇÅ + m‚ÇÇ) |
| B. | 2g (m‚ÇÅ - m‚ÇÇ)/(m‚ÇÅ + m‚ÇÇ) |
| C. | g (m‚ÇÅ + m‚ÇÇ)/(m‚ÇÅ - m‚ÇÇ) |
| D. | 2g (m‚ÇÅ + m‚ÇÇ)/(m‚ÇÅ - m‚ÇÇ) |
| Answer» B. 2g (m‚Äö√á√Ö - m‚Äö√á√á)/(m‚Äö√á√Ö + m‚Äö√á√á) | |
| 385. |
_ The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is$? |
| A. | D + d |
| B. | D - d |
| C. | D √ó d |
| D. | D / d |
| Answer» E. | |
| 386. |
_ The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.$? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of These |
| Answer» C. Equal to | |
| 387. |
_ Effect of a force on a body depends upon$? |
| A. | Magnitude |
| B. | Direction |
| C. | Position or line of action |
| D. | All of the above |
| Answer» E. | |
| 388. |
_ The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is$? |
| A. | mr²/2 |
| B. | mr²/4 |
| C. | mr²/6 |
| D. | mr²/8 |
| Answer» B. mr¬¨‚â§/4 | |
| 389. |
_ In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively$? |
| A. | ‚à ö3. W (tensile) and 2W (compressive) |
| B. | 2W (tensile) and ‚à ö3. W (compressive) |
| C. | 2‚à ö3. W (tensile) and 2‚à ö3. W (compressive) |
| D. | None of the above |
| Answer» B. 2W (tensile) and ‚Äö√ √∂3. W (compressive) | |
| 390. |
_ The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)$? |
| A. | P = mW - C |
| B. | P = m/W + C |
| C. | P = mW + C |
| D. | P = C - mW |
| Answer» D. P = C - mW | |
| 391. |
_ A single force and a couple acting in the same plane upon a rigid body$? |
| A. | Balance each other |
| B. | Cannot balance each other |
| C. | Produce moment of a couple |
| D. | Are equivalent |
| Answer» C. Produce moment of a couple | |
| 392. |
_ If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be$? |
| A. | Same |
| B. | Half |
| C. | Double |
| D. | None of these |
| Answer» B. Half | |
| 393. |
_ The velocity ratio for the third system of pulleys is$? |
| A. | n |
| B. | n² |
| C. | 2n |
| D. | 2n - 1 |
| Answer» E. | |
| 394. |
_ The loss of kinetic energy during inelastic impact, is given by (where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)$? |
| A. | [m₁ m₂/2(m₁ + m₂)] (u₁ - u₂)² |
| B. | [2(m₁ + m₂)/m₁ m₂] (u₁ - u₂)² |
| C. | [m₁ m₂/2(m₁ + m₂)] (u₁² - u₂²) |
| D. | [2(m₁ + m₂)/m₁ m₂] (u₁² - u₂²) |
| Answer» B. [2(m‚Äö√á√Ö + m‚Äö√á√á)/m‚Äö√á√Ö m‚Äö√á√á] (u‚Äö√á√Ö - u‚Äö√á√á)¬¨‚⧠| |
| 395. |
_ In actual machines$? |
| A. | Mechanical advantage is greater than velocity ratio |
| B. | Mechanical advantage is equal to velocity ratio |
| C. | Mechanical advantage is less than velocity ratio |
| D. | Mechanical advantage is unity |
| Answer» D. Mechanical advantage is unity | |
| 396. |
_ Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.$? |
| A. | Meet |
| B. | Do not meet |
| C. | Either ‘A’ or ‘B’ |
| D. | None of these |
| Answer» C. Either ‚Äö√Ñ√≤A‚Äö√Ñ√¥ or ‚Äö√Ñ√≤B‚Äö√Ñ√¥ | |
| 397. |
_ The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is$? |
| A. | 20 N |
| B. | 100 N |
| C. | 500 N |
| D. | None of these |
| Answer» D. None of these | |
| 398. |
_ The center of percussion of a solid cylinder of radius ‘r’ resting on a horizontal plane will be$? |
| A. | r/2 |
| B. | 2r/3 |
| C. | r/A |
| D. | 3r/2 |
| Answer» E. | |
| 399. |
_ The horizontal range of a projectile (R) is given by$? |
| A. | R = u² cos2α/g |
| B. | R = u² sin2α/g |
| C. | R = u² cosα/g |
| D. | R = u² sinα/g |
| Answer» C. R = u¬¨‚⧠cos≈í¬±/g | |
| 400. |
_ A framed structure is imperfect, if the numbers of members are __________ (2j - 3).$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | Either (B) or (C) |
| Answer» E. | |