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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.
| 801. |
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will$? |
| A. | Cause withdrawing or throttling of steam |
| B. | Reduce length of effective stroke of piston |
| C. | Reduce maximum opening of port to steam |
| D. | All of these |
| Answer» C. Reduce maximum opening of port to steam | |
| 802. |
Open pairs are those which have$? |
| 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» D. Two elements that permit relative motion | |
| 803. |
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.$? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | None of these |
| Answer» C. Same | |
| 804. |
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of$? |
| A. | 2 mm |
| B. | 2.22 mm |
| C. | 2.50 mm |
| D. | 3.0 mm |
| Answer» C. 2.50 mm | |
| 805. |
Scotch yoke mechanism is used to generate$? |
| A. | Sine functions |
| B. | Square roots |
| C. | Logarithms |
| D. | Inversions |
| Answer» B. Square roots | |
| 806. |
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be$? |
| A. | 90 RPM |
| B. | 100 RPM |
| C. | 80 RPM |
| D. | data are insufficient |
| Answer» B. 100 RPM | |
| 807. |
In a rigid link OA, velocity of 'A' w.r.t. 'O' will be$? |
| A. | Parallel to OA |
| B. | Perpendicular to OA |
| C. | At 45° to OA |
| D. | Along AO |
| Answer» C. At 45¬¨‚àû to OA | |
| 808. |
The Coriolis component of acceleration acts$? |
| A. | Along the sliding surface |
| B. | Perpendicular to the sliding surface |
| C. | At 45° to the sliding surface |
| D. | Parallel to the sliding surface |
| Answer» C. At 45¬¨‚àû to the sliding surface | |
| 809. |
The dedendum circle diameter is equal to (where, φ = Pressure angle)$? |
| A. | Pitch circle dia. × cosφ |
| B. | Addendum circle dia. × cosφ |
| C. | Clearance circle dia. × cosφ |
| D. | Pitch circle dia. × sinφ |
| Answer» B. Addendum circle dia. ‚àö√≥ cos≈ì√ú | |
| 810. |
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to$? |
| A. | sinφ |
| B. | cosφ |
| C. | secφ |
| D. | cosecφ |
| Answer» C. sec≈ì√ú | |
| 811. |
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 | |
| 812. |
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 | |
| 813. |
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 | |
| 814. |
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 | |
| 815. |
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 | |
| 816. |
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 | |
| 817. |
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 | |
| 818. |
The number of links in pantograph mechanism is equal to? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 819. |
The direction of Coriolis component of acceleration is the direction? |
| A. | Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link |
| B. | Along the centripetal acceleration |
| C. | Along tangential acceleration |
| D. | Along perpendicular to angular velocity |
| Answer» B. Along the centripetal acceleration | |
| 820. |
An automobile steering gear is an example of? |
| A. | Sliding pair |
| B. | Rolling pair |
| C. | Lower pair |
| D. | Higher pair |
| Answer» D. Higher pair | |
| 821. |
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 | |
| 822. |
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 | |
| 823. |
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 | |
| 824. |
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 | |
| 825. |
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 | |
| 826. |
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 | |
| 827. |
The size of cam depends upon? |
| A. | Base circle |
| B. | Pitch circle |
| C. | Prime circle |
| D. | Pitch curve |
| Answer» B. Pitch circle | |
| 828. |
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. | |
| 829. |
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 | |
| 830. |
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 | |
| 831. |
Which of the following is a turning pair?? |
| A. | Piston and cylinder of a reciprocating steam engine |
| B. | Shaft with collars at both ends fitted into a circular hole |
| C. | Lead screw of a lathe with nut |
| D. | Ball and a socket joint |
| Answer» C. Lead screw of a lathe with nut | |
| 832. |
A kinematic chain requires at least? |
| A. | 2 links and 3 turning pairs |
| B. | 3 links and 4 turning pairs |
| C. | 4 links and 4 turning pairs |
| D. | 5 links and 4 turning pairs |
| Answer» D. 5 links and 4 turning pairs | |
| 833. |
In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as? |
| A. | Tractive force |
| B. | Swaying couple |
| C. | Hammer blow |
| D. | None of these |
| Answer» B. Swaying couple | |
| 834. |
Relationship between the number of links (L) and number of pairs (P) is? |
| A. | P = 2L - 4 |
| B. | P = 2L + 4 |
| C. | P = 2L + 2 |
| D. | P = 2L - 2 |
| Answer» D. P = 2L - 2 | |
| 835. |
The contact ratio is given by? |
| A. | (Length of the path of approach)/(Circular pitch) |
| B. | (Length of path of recess)/(Circular pitch) |
| C. | (Length of the arc of contact)/(Circular pitch) |
| D. | (Length of the arc of approach)/cosφ |
| Answer» D. (Length of the arc of approach)/cos≈ì√ú | |
| 836. |
Pitch point on a cam is? |
| A. | Any point on pitch curve |
| B. | The point on cam pitch curve having the maximum pressure angle |
| C. | Any point on pitch circle |
| D. | The point on cam pitch curve having the minimum pressure angle |
| Answer» C. Any point on pitch circle | |
| 837. |
In order to balance the reciprocating masses,? |
| A. | Primary forces and couples must be balanced |
| B. | Secondary forces and couples must be balanced |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 838. |
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is? |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 270° |
| Answer» D. 270¬¨‚àû | |
| 839. |
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?? |
| A. | All points of the disc have the same velocity |
| B. | The centre of the disc has zero acceleration |
| C. | The centre of the disc has centrifugal acceleration |
| D. | The point on the disc making contact with the plane surface has zero acceleration |
| Answer» C. The centre of the disc has centrifugal acceleration | |
| 840. |
In a reciprocating engine, usually __________ of the reciprocating masses are balanced.? |
| A. | One-half |
| B. | Two-third |
| C. | Three-fourth |
| D. | Whole |
| Answer» C. Three-fourth | |
| 841. |
In a simple harmonic motion, the velocity vector with respect to displacement vector? |
| A. | Is in phase |
| B. | Leads by 90° |
| C. | Leads by 180° |
| D. | Lags by 90° |
| Answer» E. | |
| 842. |
The frictional torque transmitted by a cone clutch is same as that of? |
| A. | Flat pivot bearing |
| B. | Flat collar bearing |
| C. | Conical pivot bearing |
| D. | Truncated conical pivot bearing |
| Answer» E. | |
| 843. |
The frictional torque transmitted in a conical 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 | |
| 844. |
Scotch yoke mechanism is used to generate? |
| A. | Sine functions |
| B. | Square roots |
| C. | Logarithms |
| D. | Inversions |
| Answer» B. Square roots | |
| 845. |
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. 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» C. Reduce maximum opening of port to steam | |
| 846. |
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of? |
| A. | 2 mm |
| B. | 2.22 mm |
| C. | 2.50 mm |
| D. | 3.0 mm |
| Answer» C. 2.50 mm | |
| 847. |
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 | |
| 848. |
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 | |
| 849. |
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. | |
| 850. |
The working depth of a gear is the radial distance from the |
| A. | Pitch circle to the bottom of a tooth |
| B. | Pitch circle to the top of a tooth |
| C. | Top of a tooth to the bottom of a tooth |
| D. | Addendum circle to the clearance circle |
| Answer» E. | |