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.
| 751. |
________ is an inversion of Double slider crank chain.$? |
| A. | Coupling rod of a locomotive |
| B. | Scotch yoke mechanism |
| C. | Hand pump |
| D. | Reciprocating engine |
| Answer» C. Hand pump | |
| 752. |
The Coriolis component of acceleration leads the sliding velocity by$? |
| A. | 45° |
| B. | 90° |
| C. | 135° |
| D. | 180° |
| Answer» C. 135¬¨‚àû | |
| 753. |
The frequency of oscillation of a torsional pendulum is$? |
| A. | 2œÄk/r. ‚à ö(g/l) |
| B. | r/2œÄk. ‚à ö(l/g) |
| C. | 2œÄr/k. ‚à ö(g/l) |
| D. | r/2œÄk. ‚à ö(g/l) |
| Answer» E. | |
| 754. |
Coriolis component acts$? |
| A. | Perpendicular to sliding surfaces |
| B. | Along sliding surfaces |
| C. | Somewhere in between above two |
| D. | None of the above |
| Answer» B. Along sliding surfaces | |
| 755. |
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be$? |
| A. | To move the ship towards starboard |
| B. | To move the ship towards port side |
| C. | To raise the bow and lower the stern |
| D. | To raise the stern and lower the bow |
| Answer» B. To move the ship towards port side | |
| 756. |
The two elements of a pair are said to form a _________ when they permit relative motion between them.$? |
| A. | Open pair |
| B. | Kinematic pair |
| C. | Sliding pair |
| D. | None of these |
| Answer» C. Sliding pair | |
| 757. |
In its simplest form, a cam mechanism consists of following number of links$? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 758. |
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is$? |
| A. | (1/2). μ W cosecα (r₁ + r₂) |
| B. | (2/3). μ W cosecα (r₁ + r₂) |
| C. | (1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» E. | |
| 759. |
When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be$? |
| A. | ω²r. (n + 1)/n |
| B. | ω²r. (n - 1)/n |
| C. | ω²r. n/(n + 1) |
| D. | ω²r. n/(n - 1) |
| Answer» B. ≈ì√¢¬¨‚â§r. (n - 1)/n | |
| 760. |
In a radial cam, the follower moves$? |
| A. | In a direction perpendicular to the cam axis |
| B. | In a direction parallel to the cam axis |
| C. | In any direction irrespective of the cam axis |
| D. | Along the cam axis |
| Answer» B. In a direction parallel to the cam axis | |
| 761. |
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)$? |
| A. | r sinφ |
| B. | r cosφ |
| C. | r tanφ |
| D. | (r/2) cosφ |
| Answer» B. r cos≈ì√ú | |
| 762. |
The pair is known as a higher pair, when the relative motion between the elements of a pair is$? |
| A. | Turning only |
| B. | Sliding only |
| C. | Rolling only |
| D. | Partly turning and partly sliding |
| Answer» E. | |
| 763. |
When a point at the end of a link moves with constant angular velocity, its acceleration will have$? |
| A. | Radial component only |
| B. | Tangential component only |
| C. | Coriolis component only |
| D. | Radial and tangential components both |
| Answer» B. Tangential component only | |
| 764. |
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a$? |
| A. | Straight line |
| B. | Parabolic curve |
| C. | Triangle |
| D. | Rectangle |
| Answer» B. Parabolic curve | |
| 765. |
To connect two parallel and coplanar shafts the following type of gearing is used$? |
| A. | Spur gear |
| B. | Bevel gear |
| C. | Spiral gear |
| D. | None of the above |
| Answer» B. Bevel gear | |
| 766. |
The gear train usually employed in clocks is a$? |
| A. | Simple gear train |
| B. | Reverted gear train |
| C. | Sun and planet gear |
| D. | Differential gear |
| Answer» C. Sun and planet gear | |
| 767. |
A rigid body possesses ________degrees of freedom$? |
| A. | One |
| B. | Two |
| C. | Four |
| D. | Six |
| Answer» E. | |
| 768. |
The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as$? |
| A. | Spur gearing |
| B. | Helical gearing |
| C. | Bevel gearing |
| D. | Spiral gearing |
| Answer» B. Helical gearing | |
| 769. |
Two pulleys of radii r‚ÇÅ and r‚ÇÇ and at distance x apart are connected by means of a cross belt drive. The length of the belt is$? |
| A. | π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x |
| B. | π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x |
| C. | π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x |
| D. | π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x |
| Answer» B. ≈ì√Ñ (r‚Äö√á√Ö + r‚Äö√á√á) + [(r‚Äö√á√Ö - r‚Äö√á√á)¬¨‚â§/x] + 2x | |
| 770. |
The velocity of the belt for maximum power is (where m = Mass of the belt in kg per meter length)$? |
| A. | T/3 |
| B. | (T.g)/3 |
| C. | ‚à ö(T/3m) |
| D. | ‚à ö(3m/T) |
| Answer» D. ‚Äö√ √∂(3m/T) | |
| 771. |
A watt's governor can work satisfactorily at speeds from$? |
| A. | 60 to 80 r.p.m. |
| B. | 80 to 100 r.p.m. |
| C. | 100 to 200 r.p.m. |
| D. | 200 to 300 r.p.m. |
| Answer» B. 80 to 100 r.p.m. | |
| 772. |
If the damping factor for a vibrating system is unity, then the system will be$? |
| A. | Over damped |
| B. | Under damped |
| C. | Critically damped |
| D. | Without vibrations |
| Answer» D. Without vibrations | |
| 773. |
In which of the following type of gear train the first gear and the last gear are co-axial.$? |
| A. | Simple gear train |
| B. | Compound gear train |
| C. | Reverted gear train |
| D. | None of the above |
| Answer» D. None of the above | |
| 774. |
The main disadvantage of the sliding pair is that it is$? |
| A. | Bulky |
| B. | Wears rapidly |
| C. | Difficult to manufacture |
| D. | Both (A) and (B) above |
| Answer» E. | |
| 775. |
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)$? |
| A. | m.ω².r sinθ |
| B. | m.ω².r cosθ |
| C. | m.ω².r (sin 2θ/n) |
| D. | m.ω².r (cos 2θ/n) |
| Answer» E. | |
| 776. |
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.$? |
| A. | Sliding |
| B. | Turning |
| C. | Rolling |
| D. | Screw |
| Answer» C. Rolling | |
| 777. |
When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than$? |
| A. | 0.25 |
| B. | 0.5 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 778. |
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed$? |
| A. | Hartung governor |
| B. | Wilson Hartnell governor |
| C. | Pickering governor |
| D. | Inertia governor |
| Answer» D. Inertia governor | |
| 779. |
The sense of Coriolis component 2 ωv is same as that of the relative velocity vector v rotated at$? |
| A. | 45° in the direction of rotation of the link containing the path |
| B. | 45° in the direction opposite to the rotation of the link containing the path |
| C. | 90° in the direction of rotation of the link containing the path |
| D. | 180° in the direction opposite to the rotation of the link containing the path |
| Answer» D. 180¬¨‚àû in the direction opposite to the rotation of the link containing the path | |
| 780. |
In multi V-belt transmission, if one of the belt is broken, we have to change the$? |
| A. | Broken belt |
| B. | Broken belt and its adjacent belts |
| C. | All the belts |
| D. | There is no need of changing any one as remaining belts can take care of transmission of load |
| Answer» D. There is no need of changing any one as remaining belts can take care of transmission of load | |
| 781. |
Elements of pairs held together mechanically is known as$? |
| A. | Closed pair |
| B. | Open pair |
| C. | Mechanical pair |
| D. | Rolling pair |
| Answer» B. Open pair | |
| 782. |
The number of links in pantograph mechanism is equal to$? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 783. |
The periodic time is given by (where ω = Angular velocity of the particle in rad/s)$? |
| A. | ω/2π |
| B. | 2π/ω |
| C. | ω × 2π |
| D. | π/ω |
| Answer» C. ≈ì√¢ ‚àö√≥ 2≈ì√Ñ | |
| 784. |
In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called$? |
| A. | Lead |
| B. | Steam lap |
| C. | Exhaust lap |
| D. | None of these |
| Answer» C. Exhaust lap | |
| 785. |
For dynamic balancing of a shaft$? |
| A. | The net dynamic force acting on the shaft is equal to zero |
| B. | The net couple due to the dynamic forces acting on the shaft is equal to zero |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 786. |
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be$? |
| A. | Less sensitive |
| B. | More sensitive |
| C. | Unaffected of sensitivity |
| D. | Isochronous |
| Answer» B. More sensitive | |
| 787. |
In a gear having involute teeth, the normal to the involute is a tangent to the$? |
| A. | Pitch circle |
| B. | Base circle |
| C. | Addendum circle |
| D. | Dedendum circle |
| Answer» C. Addendum circle | |
| 788. |
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will$? |
| A. | Remain same as before |
| B. | Become equal to 2R |
| C. | Become equal to R/2 |
| D. | Become equal to R/4 |
| Answer» B. Become equal to 2R | |
| 789. |
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 the equation are __________ then the system will be under damped.$? |
| A. | (1/2) μ W R |
| B. | (2/3) μ W R |
| C. | (3/4) μ W R |
| D. | μ W R |
| Answer» C. (3/4) ≈í¬∫ W R | |
| 790. |
The size of cam depends upon$? |
| A. | Base circle |
| B. | Pitch circle |
| C. | Prime circle |
| D. | Pitch curve |
| Answer» B. Pitch circle | |
| 791. |
For the same lift and same angle of ascent, a smaller base circle will give$? |
| A. | A small value of pressure angle |
| B. | A large value of pressure angle |
| C. | There is no such relation with pressure angle |
| D. | Something else |
| Answer» C. There is no such relation with pressure angle | |
| 792. |
The critical speed of a shaft depends upon its$? |
| A. | Mass |
| B. | Stiffness |
| C. | Mass and stiffness |
| D. | Stiffness and eccentricity |
| Answer» D. Stiffness and eccentricity | |
| 793. |
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the$? |
| A. | Magnitude of the forces on journal |
| B. | Angular velocity of journal |
| C. | Clearance between journal and bearing |
| D. | Radius of journal |
| Answer» E. | |
| 794. |
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)$? |
| A. | ω₁.ω₂.r |
| B. | (ω₁ - ω₂)r |
| C. | (ω₁ + ω₂)r |
| D. | (ω₁ - ω₂)2r |
| Answer» C. (≈ì√¢‚Äö√á√Ö + ≈ì√¢‚Äö√á√á)r | |
| 795. |
The maximum fluctuation of energy is the$? |
| A. | Difference between the maximum and minimum energies |
| B. | Sum of the maximum and minimum energies |
| C. | Variations of energy above and below the mean resisting torque line |
| D. | Ratio of the mean resisting torque to the work-done per cycle |
| Answer» B. Sum of the maximum and minimum energies | |
| 796. |
Critical damping is a function of$? |
| A. | Mass and stiffness |
| B. | Mass and damping coefficient |
| C. | Mass and natural frequency |
| D. | Damping coefficient and natural frequency |
| Answer» B. Mass and damping coefficient | |
| 797. |
An automobile steering gear is an example of$? |
| A. | Sliding pair |
| B. | Rolling pair |
| C. | Lower pair |
| D. | Higher pair |
| Answer» D. Higher pair | |
| 798. |
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism$? |
| A. | 1, 2 and 4 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 799. |
In order to double the period of a simple pendulum, the length of the string should be$? |
| A. | Halved |
| B. | Doubled |
| C. | Quadrupled |
| D. | None of these |
| Answer» D. None of these | |
| 800. |
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is$? |
| A. | Kinematically sound |
| B. | Not sound |
| C. | Soundness would depend upon which link is kept fixed |
| D. | Data is not sufficient to determine same |
| Answer» B. Not sound | |