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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.
| 701. |
_The two elements of a pair are said to form a higher pair, when they$? |
| A. | Have a surface contact when in motion |
| B. | Have a line or point contact when in motion |
| C. | Are kept in contact by the action of external forces, when in motion |
| D. | Permit relative motion |
| Answer» C. Are kept in contact by the action of external forces, when in motion | |
| 702. |
_The danger of breakage and vibration is maximum$? |
| A. | Below the critical speed |
| B. | Near the critical speed |
| C. | Above the critical speed |
| D. | None of these |
| Answer» C. Above the critical speed | |
| 703. |
_The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is$? |
| A. | h/(kG² + h²) |
| B. | (kG² + h²)/h |
| C. | h²/(kG² + h²) |
| D. | (kG² + h²)/h² |
| Answer» C. h¬¨‚â§/(kG¬¨‚⧠+ h¬¨‚â§) | |
| 704. |
_The ratio of maximum fluctuation of energy to the work-done per cycle is called$? |
| A. | Fluctuation of energy |
| B. | Maximum fluctuation of energy |
| C. | Coefficient of fluctuation of energy |
| D. | None of these |
| Answer» D. None of these | |
| 705. |
_For fluctuating loads, well suited bearing is$? |
| A. | Ball bearing |
| B. | Roller bearing |
| C. | Needle roller bearing |
| D. | Thrust bearing |
| Answer» D. Thrust bearing | |
| 706. |
_In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is$? |
| A. | 12 |
| B. | 16 |
| C. | 25 |
| D. | 32 |
| Answer» E. | |
| 707. |
_Which one of the following is an exact straight line mechanism using lower pairs?$? |
| A. | Watt’s mechanism |
| B. | Grasshopper mechanism |
| C. | Robert’s mechanism |
| D. | Peaucellier’s mechanism |
| Answer» E. | |
| 708. |
_In S.H.M., the velocity vector w.r.t. displacement vector$? |
| A. | Leads by 90° |
| B. | Lags by 90° |
| C. | Leads by 180° |
| D. | Are in phase |
| Answer» B. Lags by 90¬¨‚àû | |
| 709. |
_The frictional torque transmitted by a disc or plate clutch is same as that of$? |
| A. | Flat pivot bearing |
| B. | Flat collar bearing |
| C. | Conical pivot bearing |
| D. | Truncated conical pivot bearing |
| Answer» C. Conical pivot bearing | |
| 710. |
_The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.$? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | None of these |
| Answer» C. Same | |
| 711. |
_V-belts are usually used for$? |
| A. | Long drives |
| B. | Short drives |
| C. | Long and short drives |
| D. | None of these |
| Answer» C. Long and short drives | |
| 712. |
_In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will$? |
| A. | Cause withdrawing or throttling of steam |
| B. | Reduce length of effective stroke of piston |
| C. | Reduce maximum opening of port to steam |
| D. | All of these |
| Answer» D. All of these | |
| 713. |
_When the two elements of a pair have __________ when in motion, it is said to a lower pair.$? |
| A. | Line or point contact |
| B. | Surface contact |
| C. | Body contact |
| D. | None of these |
| Answer» C. Body contact | |
| 714. |
_The lead screw of a lathe with nut forms a$? |
| A. | Rolling pair |
| B. | Sliding pair |
| C. | Screw pair |
| D. | Turning pair |
| Answer» D. Turning pair | |
| 715. |
_In a disc clutch, if there are n‚ÇÅ number of discs on the driving shaft and n‚ÇÇ number of discs on the driven shaft, then the number of pairs of contact surfaces will be$? |
| A. | n‚ÇÅ + n‚ÇÇ |
| B. | n‚ÇÅ + n‚ÇÇ + 1 |
| C. | n‚ÇÅ + n‚ÇÇ - 1 |
| D. | n‚ÇÅ + n‚ÇÇ - 2 |
| Answer» D. n‚Äö√á√Ö + n‚Äö√á√á - 2 | |
| 716. |
_The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)$? |
| A. | (ω₁ + ω₂) y |
| B. | (ω₁/ω₂) y |
| C. | (ω₁ × ω₂) y |
| D. | (ω₁ + ω₂)/y |
| Answer» D. (≈ì√¢‚Äö√á√Ö + ≈ì√¢‚Äö√á√á)/y | |
| 717. |
_The unbalanced force due to revolving masses$? |
| A. | Varies in magnitude but constant in direction |
| B. | Varies in direction but constant in magnitude |
| C. | Varies in magnitude and direction both |
| D. | Constant in magnitude and direction both |
| Answer» C. Varies in magnitude and direction both | |
| 718. |
_The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)$? |
| A. | 0.4985/ ‚à öŒ¥S |
| B. | 0.5615/ ‚à öŒ¥S |
| C. | 0.571/ ‚à öŒ¥S |
| D. | 0.6253/ ‚à öŒ¥S |
| Answer» C. 0.571/ ‚Äö√ √∂≈í¬•S | |
| 719. |
_The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)$? |
| A. | sinφ + sinα = b/c |
| B. | cosφ - sinα = c/b |
| C. | cotφ - cotα = c/b |
| D. | tanφ + cotα = b/c |
| Answer» D. tan≈ì√ú + cot≈í¬± = b/c | |
| 720. |
_The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)$? |
| A. | m.ω².r cosθ |
| B. | c.m.ω².r sinθ |
| C. | (1 - c).m.ω².r (cosθ - sinθ) |
| D. | m.ω².r (cosθ - sinθ) |
| Answer» D. m.≈ì√¢¬¨‚â§.r (cos≈í‚àè - sin≈í‚àè) | |
| 721. |
_Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is$? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 34 |
| Answer» B. 20 | |
| 722. |
_In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from$? |
| A. | 10°-15° |
| B. | 15°-25° |
| C. | 25°-30° |
| D. | 30°-40° |
| Answer» D. 30¬¨‚àû-40¬¨‚àû | |
| 723. |
_Which of the following is a pendulum type governor?$? |
| A. | Watt governor |
| B. | Porter governor |
| C. | Hartnell governor |
| D. | None of these |
| Answer» B. Porter governor | |
| 724. |
_A completely constrained motion can be transmitted with.$? |
| A. | 1 link with pin joints |
| B. | 2 links with pin joints |
| C. | 3 links with pin joints |
| D. | 4 links with pin joints |
| Answer» E. | |
| 725. |
_The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)$? |
| A. | 1/2œÄ √ó ‚à ö(s/m) |
| B. | 1/2œÄ √ó ‚à ö(g/Œ¥) |
| C. | 0.4985/‚à öŒ¥ |
| D. | Any one of these |
| Answer» E. | |
| 726. |
_In under damped vibrating system, the amplitude of vibration$? |
| A. | Decreases linearly with time |
| B. | Increases linearly with time |
| C. | Decreases exponentially with time |
| D. | Increases exponentially with time |
| Answer» D. Increases exponentially with time | |
| 727. |
_A cam with a roller follower would constitute following type of pair$? |
| A. | Lower pair |
| B. | Higher pair |
| C. | Open pair |
| D. | Close pair |
| Answer» C. Open pair | |
| 728. |
_In a multiple V-belt drive, if one of the belts is broken, then we should replace$? |
| A. | The broken belt only |
| B. | All the belts |
| C. | The broken belt and the belts on either side of it |
| D. | None of the above |
| Answer» C. The broken belt and the belts on either side of it | |
| 729. |
_According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on$? |
| A. | A triangle |
| B. | A point |
| C. | Two lines |
| D. | A straight line |
| Answer» E. | |
| 730. |
_The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)$? |
| A. | 8.95/N² |
| B. | 89.5/N² |
| C. | 895/N² |
| D. | 8950/N² |
| Answer» D. 8950/N¬¨‚⧠| |
| 731. |
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a$? |
| A. | Lower pair |
| B. | Higher pair |
| C. | Self-closed pair |
| D. | Force-closed pair |
| Answer» B. Higher pair | |
| 732. |
The maximum fluctuation of speed is the$? |
| A. | Difference of minimum fluctuation of speed and the mean speed |
| B. | Difference of the maximum and minimum speeds |
| C. | Sum of maximum and minimum speeds |
| D. | Variations of speed above and below the mean resisting torque line |
| Answer» C. Sum of maximum and minimum speeds | |
| 733. |
The approximate straight line mechanism is a$? |
| A. | Four bar linkage |
| B. | 6 bar linkage |
| C. | 8 bar linkage |
| D. | 3 bar linkage |
| Answer» B. 6 bar linkage | |
| 734. |
The rotating shafts tend to vibrate violently at whirling speeds because$? |
| A. | The system is unbalanced |
| B. | Bearing centre line coincides with the axis |
| C. | The shafts are rotating at very high speeds |
| D. | Resonance is caused due to the heavy mass of the rotor |
| Answer» E. | |
| 735. |
A point on a link connecting double slider crank chain traces a$? |
| A. | Ellipse |
| B. | Circle |
| C. | Parabola |
| D. | Hyperbola |
| Answer» B. Circle | |
| 736. |
A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents$? |
| A. | Free vibration with damping |
| B. | Free vibration without damping |
| C. | Forced vibration with damping |
| D. | Forced vibration without damping |
| Answer» D. Forced vibration without damping | |
| 737. |
To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?$? |
| A. | Spur gear |
| B. | Spiral gear |
| C. | Bevel gear |
| D. | Worm gear |
| Answer» E. | |
| 738. |
Which of the following is an example of a higher pair?$? |
| A. | Toothed gearing |
| B. | Belt and rope drive |
| C. | Ball and roller bearing |
| D. | All of these |
| Answer» E. | |
| 739. |
Which of the following would constitute a link?$? |
| A. | Piston, piston rod and cross head |
| B. | Piston and piston rod |
| C. | Piston rod and cross head |
| D. | Piston, crank pin and crank shaft |
| Answer» B. Piston and piston rod | |
| 740. |
An exact straight line motion mechanism is a$? |
| A. | Scott-Russell's mechanism |
| B. | Hart's mechanism |
| C. | Peaucellier's mechanism |
| D. | All of these |
| Answer» E. | |
| 741. |
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done$? |
| A. | Because of difficulty in manufacturing cam profile |
| B. | Because of loose contact of follower with cam surface |
| C. | In order to have acceleration in beginning and retardation at the end of stroke within the finite limits |
| D. | Because the uniform velocity motion is a partial parabolic motion |
| Answer» D. Because the uniform velocity motion is a partial parabolic motion | |
| 742. |
The maximum value of the pressure angle in case of cam is kept as$? |
| A. | 10° |
| B. | 14° |
| C. | 20° |
| D. | 30° |
| Answer» E. | |
| 743. |
The length of a simple pendulum which gives the same frequency as the compound pendulum, is$? |
| A. | kG + l‚ÇÅ |
| B. | kG² + l₁ |
| C. | (kG² + l₁²)/ l₁ |
| D. | (kG + l₁²)/ l₁ |
| Answer» D. (kG + l‚Äö√á√Ö¬¨‚â§)/ l‚Äö√á√Ö | |
| 744. |
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is$? |
| A. | 0° and 90° |
| B. | 180° and 360° |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 745. |
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)$? |
| A. | sinβ |
| B. | cosβ |
| C. | cosecβ |
| D. | secβ |
| Answer» D. sec≈í‚⧠| |
| 746. |
Which one of the following can completely balance several masses revolving in different planes on a shaft?$? |
| A. | A single mass in different planes |
| B. | Two masses in any two planes |
| C. | A single mass in one of the planes of the revolving masses |
| D. | Two equal masses in any two planes |
| Answer» C. A single mass in one of the planes of the revolving masses | |
| 747. |
Which of the following governor is used to drive a gramophone?$? |
| A. | Watt governor |
| B. | Porter governor |
| C. | Pickering governor |
| D. | Hartnell governor |
| Answer» D. Hartnell governor | |
| 748. |
The Klein's diagram is useful to find$? |
| A. | Displacement of various parts |
| B. | Velocity of various parts |
| C. | Acceleration of various parts |
| D. | Angular acceleration of various parts |
| Answer» D. Angular acceleration of various parts | |
| 749. |
Which gear train is used for higher velocity ratios in a small space?$? |
| A. | Simple gear train |
| B. | Compound gear train |
| C. | Reverted gear train |
| D. | Epicyclic gear train |
| Answer» E. | |
| 750. |
Angle of dwell of cam is defined as the angle$? |
| A. | During which the follower returns to its initial position |
| B. | Of rotation of the cam for 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» D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position | |