MCQOPTIONS
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MCQOPTIONS
This section includes 977 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
_ For an isochronous Hartnell governor (where r‚ÇÅ and r‚ÇÇ = Maximum and minimum radius of rotation of balls respectively, S‚ÇÅ and S‚ÇÇ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)$? |
| A. | (m.g + S‚ÇÅ)/(m.g + S‚ÇÇ) = r‚ÇÅ/r‚ÇÇ |
| B. | (m.g - S‚ÇÅ)/(m.g - S‚ÇÇ) = r‚ÇÇ/r‚ÇÅ |
| C. | S‚ÇÅ/S‚ÇÇ = r‚ÇÅ/r‚ÇÇ |
| D. | S‚ÇÇ/S‚ÇÅ = r‚ÇÅ/r‚ÇÇ |
| Answer» B. (m.g - S‚Äö√á√Ö)/(m.g - S‚Äö√á√á) = r‚Äö√á√á/r‚Äö√á√Ö | |
| 602. |
_ Which of the following has sliding motion?$? |
| A. | Crank |
| B. | Connecting rod |
| C. | Crank pin |
| D. | Cross-head |
| Answer» E. | |
| 603. |
_ The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is$? |
| A. | (1/2) μ W R cosecα |
| B. | (2/3) μ W R cosecα |
| C. | (3/4) μ W R cosecα |
| D. | μ W R cosecα |
| Answer» B. (2/3) ≈í¬∫ W R cosec≈í¬± | |
| 604. |
_ ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is$? |
| A. | (1/3). v |
| B. | (2/3). v |
| C. | (3/2). v |
| D. | (9/4). v |
| Answer» D. (9/4). v | |
| 605. |
_ Higher pairs are those which have$? |
| A. | Point or line contact between the two elements when in motion |
| B. | Surface contact between the two elements when in motion |
| C. | Elements of pairs not held together mechanically |
| D. | Two elements that permit relative motion |
| Answer» B. Surface contact between the two elements when in motion | |
| 606. |
_ The frequency of oscillation at compared to earth will be$? |
| A. | 6 times more |
| B. | 6 times less |
| C. | 2.44 times more |
| D. | 2.44 times less |
| Answer» E. | |
| 607. |
_ The C.G. of a link in any mechanism would experience$? |
| A. | No acceleration |
| B. | Linear acceleration |
| C. | Angular acceleration |
| D. | Both angular and linear accelerations |
| Answer» E. | |
| 608. |
_ In gears, interference takes place when$? |
| A. | The tip of a tooth of a mating gear digs into the portion between base and root circles |
| B. | Gears do not move smoothly in the absence of lubrication |
| C. | Pitch of the gears is not same |
| D. | Gear teeth are undercut |
| Answer» B. Gears do not move smoothly in the absence of lubrication | |
| 609. |
_ A reed type tachometer use the principle of$? |
| A. | Longitudinal vibration |
| B. | Torsional vibration |
| C. | Transverse vibration |
| D. | Damped free vibration |
| Answer» D. Damped free vibration | |
| 610. |
_ The relative velocity of B with respect to A in a rigid link AB is$? |
| A. | Parallel to AB |
| B. | Perpendicular to AB |
| C. | Along AB |
| D. | At 45° to AB |
| Answer» C. Along AB | |
| 611. |
_ Module of a gear is$? |
| A. | D/T |
| B. | T/D |
| C. | 2D/T |
| D. | 2T/D |
| Answer» B. T/D | |
| 612. |
_ In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is$? |
| A. | Equal to sum of other two |
| B. | Greater than sum of other two |
| C. | Less than sum of other two |
| D. | There is no such relationship |
| Answer» D. There is no such relationship | |
| 613. |
_ When the primary direct crank of a reciprocating engine makes an angle of 'θ' with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.$? |
| A. | θ/2 |
| B. | θ |
| C. | 2θ |
| D. | 4θ |
| Answer» D. 4≈í‚àè | |
| 614. |
_ In railway axle boxes, the bearing used is$? |
| A. | Deep groove ball bearing |
| B. | Double row self aligning ball bearing |
| C. | Double row spherical roller bearing |
| D. | Cylindrical roller bearing |
| Answer» D. Cylindrical roller bearing | |
| 615. |
_ The angle of inclination of the plane, at which the body begins to move down the plane is called$? |
| A. | Angle of friction |
| B. | Angle of repose |
| C. | Angle of projection |
| D. | None of these |
| Answer» C. Angle of projection | |
| 616. |
_ The secondary unbalanced force is __________ the primary unbalanced force.$? |
| A. | One-half |
| B. | Two-third |
| C. | n times |
| D. | 1/n times |
| Answer» E. | |
| 617. |
_ The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.$? |
| A. | One-third |
| B. | Two-third |
| C. | Double |
| D. | Three times |
| Answer» E. | |
| 618. |
_ The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.$? |
| A. | Vertically and parallel |
| B. | Vertically and perpendicular |
| C. | Horizontally and parallel |
| D. | Horizontally and perpendicular |
| Answer» E. | |
| 619. |
_ Kinematic pairs are those which have two elements that$? |
| A. | Have line contact |
| B. | Have surface contact |
| C. | Permit relative motion |
| D. | Are held together |
| Answer» D. Are held together | |
| 620. |
_ Rectangular bar in a rectangular hole is the following type of pair$? |
| A. | Completely constrained motion |
| B. | Partially constrained motion |
| C. | Incompletely constrained motion |
| D. | Freely constrained motion |
| Answer» B. Partially constrained motion | |
| 621. |
_ The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)$? |
| A. | (r₁ - r₂) (1 - cosθ) |
| B. | (r₁ + r₂) (1 + cosθ) |
| C. | (r₁ - r₂) [(1 - cosθ)/cosθ] |
| D. | (r₁ + r₂) [(1 - cosθ)/cosθ] |
| Answer» E. | |
| 622. |
_ The amplitude of vibration is always __________ the radius of the circle.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» B. Less than | |
| 623. |
_ Oldham’s coupling is an inversion of the kinematic chain used in$? |
| A. | Whitworth quick return mechanism |
| B. | Elliptical trammels |
| C. | Rotary engine |
| D. | Universal joint |
| Answer» C. Rotary engine | |
| 624. |
_ The ratio of the number of teeth to the pitch circle diameter in millimeters, is called$? |
| A. | Circular pitch |
| B. | Diametral pitch |
| C. | Module |
| D. | None of these |
| Answer» C. Module | |
| 625. |
_ The ratio of maximum fluctuation of speed to the mean speed is called$? |
| A. | Fluctuation of speed |
| B. | Maximum fluctuation of speed |
| C. | Coefficient of fluctuation of speed |
| D. | None of these |
| Answer» D. None of these | |
| 626. |
_ When two links are connected by a pin joint, their instantaneous center lies$? |
| A. | On their point of contact |
| B. | At the center of curvature |
| C. | At the center of circle |
| D. | At the pin joint |
| Answer» E. | |
| 627. |
_ In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)$? |
| A. | P = W tan(α - φ) |
| B. | P = W tan(α + φ) |
| C. | P = W tan(φ - α) |
| D. | P = W cos(α + φ) |
| Answer» C. P = W tan(≈ì√ú - ≈í¬±) | |
| 628. |
_ The Whitworth quick return motion mechanism is formed in a slider crank chain when the$? |
| A. | Coupler link is fixed |
| B. | Longest link is a fixed link |
| C. | Slider is a fixed link |
| D. | Smallest link is a fixed link |
| Answer» B. Longest link is a fixed link | |
| 629. |
_ A mechanism _________ for transmitting or transforming motion.$? |
| A. | Can be used |
| B. | Can not be used |
| C. | Unpredictable |
| D. | None of these |
| Answer» B. Can not be used | |
| 630. |
_ In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the center of drum, and n = Number of blocks)$? |
| A. | T₁/T₂ = μ. θ. n |
| B. | T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n |
| C. | T₁/T₂ = (μ θ)n |
| D. | T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n |
| Answer» E. | |
| 631. |
_ The inversion of a mechanism is$? |
| A. | Changing of a higher pair to a lower pair |
| B. | Turning its upside down |
| C. | Obtained by fixing different links in a kinematic chain |
| D. | Obtained by reversing the input and output motion |
| Answer» D. Obtained by reversing the input and output motion | |
| 632. |
_ The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as$? |
| A. | Damping factor |
| B. | Damping coefficient |
| C. | Logarithmic decrement |
| D. | Magnification factor |
| Answer» E. | |
| 633. |
_ In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links$? |
| A. | Will remain same |
| B. | Will change |
| C. | Could change or remain unaltered depending on which link is fixed |
| D. | Will not occur |
| Answer» B. Will change | |
| 634. |
_ The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is$? |
| A. | Fc = ar + b |
| B. | Fc = ar - b |
| C. | Fc = ar |
| D. | Fc = a/r + b |
| Answer» C. Fc = ar | |
| 635. |
_ The example of higher pair is$? |
| A. | Belt, rope and chain drives |
| B. | Gears, cams |
| C. | Ball and roller bearings |
| D. | All of the above |
| Answer» E. | |
| 636. |
_ For the brake to be self locking, the force P at C shown in the below figure, should$? |
| A. | Be zero |
| B. | Act in upward direction |
| C. | Act in downward direction |
| D. | None of these |
| Answer» B. Act in upward direction | |
| 637. |
_ In elliptical trammels$? |
| A. | All four pairs are turning |
| B. | Three pairs turning and one pair sliding |
| C. | Two pairs turning and two pairs sliding |
| D. | One pair turning and three pairs sliding |
| Answer» D. One pair turning and three pairs sliding | |
| 638. |
_ In an open pair, the two elements of a pair$? |
| A. | Have a surface contact when in motion |
| B. | Have a line or point contact when in motion |
| C. | Are kept in contact by the action of external forces, when in motion |
| D. | Are not held together mechanically |
| Answer» E. | |
| 639. |
_ The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r‚ÇÅ and r‚ÇÇ = External and internal radii of collar respectively)$? |
| A. | (1/2). μ W (r₁ + r₂) |
| B. | (2/3). μ W (r₁ + r₂) |
| C. | (1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» E. | |
| 640. |
_ The following is the inversion of slider crank chain mechanism$? |
| A. | Whitworth quick return mechanism |
| B. | Hand pump |
| C. | Oscillating cylinder engine |
| D. | All of the above |
| Answer» E. | |
| 641. |
_ With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to$? |
| A. | 10° |
| B. | 20° |
| C. | 30° |
| D. | 40° |
| Answer» E. | |
| 642. |
_ The number of links and instantaneous centers in a reciprocating engine mechanism are$? |
| A. | 4, 4 |
| B. | 4, 5 |
| C. | 5, 4 |
| D. | 4, 6 |
| Answer» E. | |
| 643. |
_ Cam angle is defined as the angle$? |
| A. | During which the follower returns to its initial position |
| B. | Of rotation of the cam for a definite displacement of the follower |
| C. | Through which, the cam rotates during the period in which the follower remains in the highest position |
| D. | Moved by the cam from the instant the follower begins to rise, till it reaches its highest position |
| Answer» C. Through which, the cam rotates during the period in which the follower remains in the highest position | |
| 644. |
_ Which of the following is an inversion of a double slider crank chain?$? |
| A. | Oldham's coupling |
| B. | Elliptical trammel |
| C. | Scotch yoke mechanism |
| D. | All of these |
| Answer» E. | |
| 645. |
_ Which of the following mechanisms produces mathematically an exact straight line motion?$? |
| A. | Grasshopper mechanism |
| B. | Watt mechanism |
| C. | Peaucellier's mechanism |
| D. | Tchebicheff mechanism |
| Answer» D. Tchebicheff mechanism | |
| 646. |
_ If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to$? |
| A. | l - 2 |
| B. | l - 1 |
| C. | l |
| D. | l + 1 |
| Answer» D. l + 1 | |
| 647. |
_ In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then$? |
| A. | Open belt drive is recommended |
| B. | Crossed belt drive is recommended |
| C. | Both open belt drive and crossed belt drive is recommended |
| D. | The drive is recommended depending upon the torque transmitted |
| Answer» C. Both open belt drive and crossed belt drive is recommended | |
| 648. |
_ Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?$? |
| A. | Theory of machines |
| B. | Applied mechanics |
| C. | Mechanisms |
| D. | Kinetics |
| Answer» B. Applied mechanics | |
| 649. |
_ The primary unbalanced force is maximum _________ in one revolution of the crank.$? |
| A. | Twice |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» B. Four times | |
| 650. |
_ The steering of a ship means$? |
| A. | Movement of a complete ship up and down in vertical plane about transverse axis |
| B. | Turning of a complete ship in a curve towards right or left, while it moves forward |
| C. | Rolling of a complete ship sideways |
| D. | None of the above |
| Answer» C. Rolling of a complete ship sideways | |