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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.
| 651. |
_ In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» B. Less than | |
| 652. |
_ When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be$? |
| A. | Minimum |
| B. | Zero |
| C. | Maximum |
| D. | None of these |
| Answer» C. Maximum | |
| 653. |
_ When the sleeve of a Porter governor moves downwards, the governor speed$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 654. |
_ Any point on a link connecting double slider crank chain will trace a$? |
| A. | Straight line |
| B. | Circle |
| C. | Ellipse |
| D. | Parabola |
| Answer» D. Parabola | |
| 655. |
_ In order to give a complete secondary balance of a multi-cylinder inline engine,$? |
| A. | The algebraic sum of the secondary forces must be equal to zero |
| B. | The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 656. |
_ When a point moves along a straight line, its acceleration will have$? |
| A. | Radial component only |
| B. | Tangential component only |
| C. | Coriolis component only |
| D. | Radial and tangential components both |
| Answer» C. Coriolis component only | |
| 657. |
_ Which gear is used for connecting two coplanar and intersecting shafts?$? |
| A. | Spur gear |
| B. | Helical gear |
| C. | Bevel gear |
| D. | None of the above |
| Answer» D. None of the above | |
| 658. |
_ The example of rolling pair is$? |
| A. | Bolt and nut |
| B. | Lead screw of a lathe |
| C. | Ball and socket joint |
| D. | Ball bearing and roller bearing |
| Answer» E. | |
| 659. |
_ The method of direct and reverse cranks is used in engines for$? |
| A. | The control of speed fluctuations |
| B. | Balancing of forces and couples |
| C. | Kinematic analysis |
| D. | Vibration analysis |
| Answer» C. Kinematic analysis | |
| 660. |
_ In higher pair, the relative motion is$? |
| A. | Purely turning |
| B. | Purely sliding |
| C. | Purely rotary |
| D. | Combination of sliding and turning |
| Answer» E. | |
| 661. |
_ The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as$? |
| A. | Turning pair |
| B. | Rolling pair |
| C. | Sliding pair |
| D. | Spherical pair |
| Answer» B. Rolling pair | |
| 662. |
_ In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by$? |
| A. | ω² × NO |
| B. | ω² × CO |
| C. | ω² × CN |
| D. | ω² × QN |
| Answer» D. ≈ì√¢¬¨‚⧠‚àö√≥ QN | |
| 663. |
_ The mechanism forms a structure, when the number of degrees of freedom (n) is equal to$? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | -1 |
| Answer» B. 1 | |
| 664. |
_ The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0. If the roots of this equation are real, then the system will be$? |
| A. | Over-damped |
| B. | Under damped |
| C. | Critically damped |
| D. | Without vibrations |
| Answer» B. Under damped | |
| 665. |
_ To obviate axial thrust, following gear drive is used$? |
| A. | Double helical gears having opposite teeth |
| B. | Double helical gears having identical teeth |
| C. | Single helical gear in which one of the teeth of helix angle a is more |
| D. | Mutter gears |
| Answer» B. Double helical gears having identical teeth | |
| 666. |
_ The mechanism in which two are turning pairs and two are sliding pairs, is called a$? |
| A. | Double slider crank chain |
| B. | Elliptical trammel |
| C. | Scotch yoke mechanism |
| D. | All of these |
| Answer» E. | |
| 667. |
_ The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)$? |
| A. | ωr [sin θ + (sin 2θ/n)] |
| B. | ωr [cos θ + (cos 2θ/n)] |
| C. | ω²r [sin θ + (sin 2θ/n)] |
| D. | ω²r [cos θ + (cos 2θ/n)] |
| Answer» B. ≈ì√¢r [cos ≈í‚àè + (cos 2≈í‚àè/n)] | |
| 668. |
_ A kinematic chain is known as a mechanism when$? |
| A. | None of the links is fixed |
| B. | One of the links is fixed |
| C. | Two of the links are fixed |
| D. | None of these |
| Answer» C. Two of the links are fixed | |
| 669. |
__When the particles of a body moves perpendicular to its axis, then the body is said to have__ |
| A. | Longitudinal vibration |
| B. | Transverse vibration |
| C. | Torsional vibration |
| D. | None of these |
| Answer» C. Torsional vibration | |
| 670. |
__Which of the following statement is correct?__ |
| A. | The primary unbalanced force is less than the secondary unbalanced force |
| B. | The primary unbalanced force is maximum twice in one revolution of the crank |
| C. | The unbalanced force due to reciprocating masses varies in magnitude and direction both |
| D. | The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder center lines |
| Answer» C. The unbalanced force due to reciprocating masses varies in magnitude and direction both | |
| 671. |
__When one of the links of a kinematic chain is fixed, the chain is known as a__ |
| A. | Structure |
| B. | Mechanism |
| C. | Inversion |
| D. | Machine |
| Answer» C. Inversion | |
| 672. |
__When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.__ |
| A. | Same |
| B. | Opposite |
| C. | Perpendicular |
| D. | None of these |
| Answer» C. Perpendicular | |
| 673. |
__In a shaper mechanism, the Coriolis component of acceleration will__ |
| A. | Not exist |
| B. | Exist |
| C. | Depend on position of crank |
| D. | None of the above |
| Answer» C. Depend on position of crank | |
| 674. |
__When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)__ |
| A. | [(r² + R²) cosφ]/2 |
| B. | [(r² + R²) sinφ]/2 |
| C. | [(r + R) cosφ]/2 |
| D. | [(r + R) sinφ]/2 |
| Answer» E. | |
| 675. |
__The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)__ |
| A. | μwr |
| B. | ¾μWR |
| C. | ²/₃ μWR |
| D. | ½μWR |
| Answer» E. | |
| 676. |
__Carnot cycle is__ |
| A. | a reversible cycle |
| B. | an irreversible cycle |
| C. | a semi-reversible cycle |
| D. | a quasi static cycle |
| Answer» B. an irreversible cycle | |
| 677. |
__A spring controlled governor is found unstable. It can be made stable by__ |
| A. | Increasing the spring stiffness |
| B. | Decreasing the spring stiffness |
| C. | Increasing the ball mass |
| D. | Decreasing the ball mass |
| Answer» C. Increasing the ball mass | |
| 678. |
__The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the__ |
| A. | Pitch circle |
| B. | Base circle |
| C. | Pitch curve |
| D. | Prime circle |
| Answer» D. Prime circle | |
| 679. |
__A spring controlled governor is said to be isochronous when the controlling force__ |
| A. | Increases as the radius of rotation decreases |
| B. | Increases as the radius of rotation increases |
| C. | Decreases as the radius of rotation increases |
| D. | Remain constant for all radii of rotation |
| Answer» E. | |
| 680. |
__Cross head and guides form a__ |
| A. | Lower pair |
| B. | Higher pair |
| C. | Turning pair |
| D. | Sliding pair |
| Answer» E. | |
| 681. |
__If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be__ |
| A. | Four times the first one |
| B. | Same as the first one |
| C. | One fourth of the first one |
| D. | One and a half times the first one |
| Answer» D. One and a half times the first one | |
| 682. |
__Which of the following statement is wrong?__ |
| A. | The difference between the maximum and minimum energies is called maximum fluctuation of energy |
| B. | The coefficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed |
| C. | The variations of energy above and below the mean resisting torque line is known as fluctuation of energy |
| D. | None of the above |
| Answer» E. | |
| 683. |
__The indicator using Watt mechanism is known as__ |
| A. | Thompson indicator |
| B. | Richard indicator |
| C. | Simplex indicator |
| D. | Thomson indicator |
| Answer» C. Simplex indicator | |
| 684. |
_A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when$? |
| A. | a is +ve and b = 0 |
| B. | a = 0 and b is +ve |
| C. | a is +ve and b is -ve |
| D. | a is +ve and b is also +ve |
| Answer» B. a = 0 and b is +ve | |
| 685. |
_The cam and follower is an example of$? |
| A. | Sliding pair |
| B. | Rolling pair |
| C. | Lower pair |
| D. | Higher pair |
| Answer» E. | |
| 686. |
_Which of the following is a lower pair?$? |
| A. | Ball and socket i |
| B. | Piston and cylinder |
| C. | Cam and follower |
| D. | Both (A) and (B) above |
| Answer» E. | |
| 687. |
_The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)$? |
| A. | n = 3(l - 1) - 2j - h |
| B. | n = 2(l - 1) - 2j - h |
| C. | n = 3(l - 1) - 3j - h |
| D. | n = 2(l - 1) - 3j - h |
| Answer» B. n = 2(l - 1) - 2j - h | |
| 688. |
_The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in$? |
| A. | Transverse vibrations |
| B. | Torsional vibrations |
| C. | Longitudinal vibrations |
| D. | All of these |
| Answer» B. Torsional vibrations | |
| 689. |
_A mechanism is an assemblage of$? |
| A. | Two links |
| B. | Three links |
| C. | Four or more than four links |
| D. | All of these |
| Answer» D. All of these | |
| 690. |
_The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)$? |
| A. | (1/2) μ W R |
| B. | (2/3) μ W R |
| C. | (3/4) μ W R |
| D. | μ W R |
| Answer» B. (2/3) ≈í¬∫ W R | |
| 691. |
_The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to$? |
| A. | One lower pair and two additional links |
| B. | Two lower pairs and one additional link |
| C. | Two lower pairs and two additional links |
| D. | Any one of these |
| Answer» C. Two lower pairs and two additional links | |
| 692. |
_Klein's construction gives a graphic construction for$? |
| A. | Slider-crank mechanism |
| B. | Velocity polygon |
| C. | Acceleration polygon |
| D. | Four bar chain mechanism |
| Answer» D. Four bar chain mechanism | |
| 693. |
_The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by$? |
| A. | ω² R cosθ |
| B. | ω² (R - r₁) cosθ |
| C. | ω² (R - r₁) sinθ |
| D. | ω² r₁ sinθ |
| Answer» C. ≈ì√¢¬¨‚⧠(R - r‚Äö√á√Ö) sin≈í‚àè | |
| 694. |
_Which of the following mechanism is obtained from lower pair?$? |
| A. | Gyroscope |
| B. | Pantograph |
| C. | Valve and valve gears |
| D. | All of the above |
| Answer» E. | |
| 695. |
_The Klein's method of construction for reciprocating engine mechanism$? |
| A. | Is based on acceleration diagram |
| B. | Is a simplified form of instantaneous center method |
| C. | Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine |
| D. | Enables determination of Cariole’s component |
| Answer» D. Enables determination of Cariole‚Äö√Ñ√¥s component | |
| 696. |
_When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be$? |
| A. | Stable |
| B. | Unstable |
| C. | Isochronous |
| D. | None of these |
| Answer» C. Isochronous | |
| 697. |
_When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a$? |
| A. | D-slide valve |
| B. | Governor |
| C. | Meyer's expansion valve |
| D. | Flywheel |
| Answer» C. Meyer's expansion valve | |
| 698. |
_The velocity of the rubbing surface __________ with the distance from the axis of the bearing.$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Decreases | |
| 699. |
_In a four stroke I.C. engine, the turning moment during the compression stroke is$? |
| A. | Positive throughout |
| B. | Negative throughout |
| C. | Positive during major portion of the stroke |
| D. | Negative during major portion of the stroke |
| Answer» C. Positive during major portion of the stroke | |
| 700. |
_The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)$? |
| A. | R (1 - cosθ) |
| B. | (R - r₁) (1 - cosθ) |
| C. | R (1 - sinθ) |
| D. | (R - r₁) (1 - sinθ) |
| Answer» C. R (1 - sin≈í‚àè) | |