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MCQOPTIONS
This section includes 1003 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. |
_When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will$? |
| A. | Have contact at the bottom most of the bearing |
| B. | Move towards right of the bearing making no metal to metal contact |
| C. | Move towards right of the bearing making the metal to metal contact |
| D. | Move towards left of the bearing making metal to metal contact |
| Answer» E. | |
| 652. |
_The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as$? |
| A. | (Kf + 1)/ (Kt + 1) |
| B. | (Kf - 1)/ (Kt - 1) |
| C. | (Kt + 1)/ (Kf + 1) |
| D. | (Kt - 1)/ (Kf - 1) |
| Answer» C. (Kt + 1)/ (Kf + 1) | |
| 653. |
_When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be$? |
| A. | F/bh |
| B. | 3F/2bh |
| C. | 2F/bh |
| D. | 4F/bh |
| Answer» C. 2F/bh | |
| 654. |
_The bending stress in a curved beam is$? |
| A. | Zero at the centroidal axis |
| B. | Zero at the point other than centroidal axis |
| C. | Maximum at the neutral axis |
| D. | None of these |
| Answer» C. Maximum at the neutral axis | |
| 655. |
_The resistance to fatigue of a material is measured by$? |
| A. | Elastic limit |
| B. | Ultimate tensile strength |
| C. | Young's modulus |
| D. | Endurance limit |
| Answer» E. | |
| 656. |
_The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)$? |
| A. | p = D sin (90°/T) |
| B. | p = D sin (120°/T) |
| C. | p = D sin (180°/T) |
| D. | p = D sin (360°/T) |
| Answer» D. p = D sin (360¬¨‚àû/T) | |
| 657. |
_In thrust bearings, the load acts$? |
| A. | Along the axis of rotation |
| B. | Parallel to the axis of rotation |
| C. | Perpendicular to the axis of rotation |
| D. | In any direction |
| Answer» B. Parallel to the axis of rotation | |
| 658. |
_In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to$? |
| A. | Reduce vibration |
| B. | Reduce slip |
| C. | Ensure uniform loading |
| D. | Ensure proper alignment |
| Answer» D. Ensure proper alignment | |
| 659. |
_In hydrodynamic bearings$? |
| A. | The oil film pressure is generated only by the rotation of the journal |
| B. | The oil film is maintained by supplying oil under pressure |
| C. | Do not require external supply of lubricant |
| D. | Grease is used for lubrication |
| Answer» B. The oil film is maintained by supplying oil under pressure | |
| 660. |
_In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing$? |
| A. | Remains constant at all speeds |
| B. | Is minimum at zero speed and increases monotonically with increase in speed |
| C. | Is maximum at zero speed and decreases monotonically with increase in speed |
| D. | Becomes minimum at an optimum speed and then increases with further increase in speed |
| Answer» E. | |
| 661. |
_In hydrostatic bearings$? |
| A. | The Oil film pressure is generated only by the rotation of the journal |
| B. | The oil film is maintained by supplying oil under pressure |
| C. | Do not require external supply of lubricant |
| D. | Grease is used for lubrication |
| Answer» C. Do not require external supply of lubricant | |
| 662. |
_An open belt drive is used when$? |
| A. | Shafts are arranged at right angles and rotate in one definite direction |
| B. | Shafts are arranged parallel and rotate in the opposite directions |
| C. | Shafts are arranged parallel and rotate in the same directions |
| D. | Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft |
| Answer» D. Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft | |
| 663. |
_The design of shafts made of brittle materials is based on$? |
| A. | Guest's theory |
| B. | Rankine's theory |
| C. | St Venant's theory |
| D. | Von Mises theory |
| Answer» C. St Venant's theory | |
| 664. |
_An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the$? |
| A. | Tip of the pinion and flank of gear |
| B. | Tip of the gear and flank of pinion |
| C. | Flanks of both gear and pinion |
| D. | Tip of both gear and pinion |
| Answer» C. Flanks of both gear and pinion | |
| 665. |
_The expression 0.175 - 0.841/T is the Lewis form factor for$? |
| A. | 14½° composite and full depth involute system |
| B. | 20° full depth involute system |
| C. | 20° stub system |
| D. | None of the above |
| Answer» D. None of the above | |
| 666. |
_A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be$? |
| A. | 2.5 |
| B. | 2.8 |
| C. | 3.0 |
| D. | 3.5 |
| Answer» C. 3.0 | |
| 667. |
_According to I.B.R., the factor of safety of riveted joint should not be less than$? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 668. |
_The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that$? |
| A. | It is subjected to a higher cyclic loading than the outer side |
| B. | It is subjected to a higher stress than the outer side |
| C. | It is more stretched than the outer side during the manufacturing process |
| D. | It has a lower curvature than the outer side |
| Answer» B. It is subjected to a higher stress than the outer side | |
| 669. |
_In leaf springs, the longest leaf is known as$? |
| A. | Master leaf |
| B. | Lower leaf |
| C. | Upper leaf |
| D. | None of these |
| Answer» B. Lower leaf | |
| 670. |
_The sleeve or muff coupling is designed as a$? |
| A. | Dun cylinder |
| B. | Hollow shaft |
| C. | Solid shaft |
| D. | Thick cylinder |
| Answer» C. Solid shaft | |
| 671. |
_The property of a bearing material which has the ability to accommodate small particles of dust, grit etc. without scoring the material of the journal, is called$? |
| A. | Bondability |
| B. | Embeddability |
| C. | Comformability |
| D. | Fatigue strength |
| Answer» C. Comformability | |
| 672. |
_The product of the diametral pitch and circular pitch is equal to$? |
| A. | 1 |
| B. | 1/π |
| C. | π |
| D. | π × number of teeth |
| Answer» D. ≈ì√Ñ ‚àö√≥ number of teeth | |
| 673. |
_A flange coupling is used to connect two shafts$? |
| A. | Which are perfectly aligned |
| B. | Which are not in exact alignment |
| C. | Have lateral misalignment |
| D. | Whose axes intersect at a small angle |
| Answer» B. Which are not in exact alignment | |
| 674. |
_A hot short metal is$? |
| A. | Brittle when cold |
| B. | Brittle when hot |
| C. | Brittle under all conditions |
| D. | Ductile at high temperature |
| Answer» C. Brittle under all conditions | |
| 675. |
_Eye bolts are used for$? |
| A. | Foundation purposes |
| B. | Absorbing shock and vibrations |
| C. | Transmission of power |
| D. | Lifting and transportation of machines and cubicles |
| Answer» E. | |
| 676. |
_Multiple threads are used to secure$? |
| A. | Low efficiency |
| B. | High efficiency |
| C. | High load lifting capacity |
| D. | High mechanical advantage |
| Answer» C. High load lifting capacity | |
| 677. |
_Two shafts will have equal strength, if$? |
| A. | Diameter of both the shafts is same |
| B. | Angle of twist of both the shafts is same |
| C. | Material of both the shafts is same |
| D. | Twisting moment of both the shafts is same |
| Answer» E. | |
| 678. |
_When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)$? |
| A. | d.t.τu |
| B. | πd.t.τu |
| C. | π/4 × d².τu |
| D. | π/4 × d² × tτu |
| Answer» C. ≈ì√Ñ/4 ‚àö√≥ d¬¨‚â§.≈ì√ëu | |
| 679. |
_Taper usually provided on cotter is$? |
| A. | 1 in 5 |
| B. | 1 in 10 |
| C. | 1 in 24 |
| D. | 1 in 40 |
| Answer» D. 1 in 40 | |
| 680. |
_The piston pin bearings in heavy duty diesel engines are$? |
| A. | Needle roller bearings |
| B. | Tapered roller bearings |
| C. | Spherical roller bearings |
| D. | Cylindrical roller bearings |
| Answer» B. Tapered roller bearings | |
| 681. |
_Deep groove ball bearings are used for$? |
| A. | Heavy thrust load only |
| B. | Small angular displacement of shafts |
| C. | Radial load at high speed |
| D. | Combined thrust and radial loads at high speed |
| Answer» E. | |
| 682. |
_Maximum principal stress theory is applicable for$? |
| A. | Ductile materials |
| B. | Brittle materials |
| C. | Elastic materials |
| D. | All of the above |
| Answer» C. Elastic materials | |
| 683. |
_In designing a connecting rod, it is considered like __________ for buckling about X-axis.$? |
| A. | Both ends hinged |
| B. | Both ends fixed |
| C. | One end fixed and the other end hinged |
| D. | One end fixed and the other end free |
| Answer» B. Both ends fixed | |
| 684. |
_A connecting rod should be$? |
| A. | Strong in buckling about X-axis |
| B. | Strong in buckling about Y-axis |
| C. | Equally strong in buckling about X-axis and Y-axis |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 685. |
_A screw is said to be a self locking screw, if its efficiency is$? |
| A. | Less than 50% |
| B. | More than 50% |
| C. | Equal to 50% |
| D. | None of these |
| Answer» B. More than 50% | |
| 686. |
_The standard length of the shaft is$? |
| A. | 6 m |
| B. | 5 m |
| C. | 7 m |
| D. | All of these |
| Answer» E. | |
| 687. |
_Rankine's theory is used for$? |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Elastic materials |
| D. | Plastic materials |
| Answer» B. Ductile materials | |
| 688. |
_In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to$? |
| A. | 1 d |
| B. | 1.25 d |
| C. | 1.5 d |
| D. | 1.75 d |
| Answer» D. 1.75 d | |
| 689. |
_Which of the following is not correct procedure to increase the fatigue limit?$? |
| A. | Cold working |
| B. | Shot peening |
| C. | Surface decarburisation |
| D. | Under stressing |
| Answer» D. Under stressing | |
| 690. |
_The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.$? |
| A. | Heavier |
| B. | Lighter |
| C. | Moderate |
| D. | None of these |
| Answer» C. Moderate | |
| 691. |
_In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)$? |
| A. | 1 d |
| B. | 1.5 d |
| C. | 2.5 d |
| D. | 2 d |
| Answer» C. 2.5 d | |
| 692. |
_The design of the pressure vessel is based on$? |
| A. | Longitudinal stress |
| B. | Hoop stress |
| C. | Longitudinal and hoop stress |
| D. | None of these |
| Answer» C. Longitudinal and hoop stress | |
| 693. |
_A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 694. |
_When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is$? |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» D. Bending stress | |
| 695. |
_The radial distance from the __________ to the clearance circle is called working depth.$? |
| A. | Addendum circle |
| B. | Dedendum circle |
| C. | Pitch circle |
| D. | None of these |
| Answer» B. Dedendum circle | |
| 696. |
_The strength of the unriveted plate (P) per pitch length is equal to$? |
| A. | p.d.σt |
| B. | p.t.σt |
| C. | (p - d) σt |
| D. | (p - d) t.σt |
| Answer» C. (p - d) ≈ì√ât | |
| 697. |
_Factor of safety for fatigue loading is the ratio of$? |
| A. | Elastic limit to the working stress |
| B. | Elastic limit to the yield point |
| C. | Endurance limit to the working stress |
| D. | Young's modulus to the ultimate tensile strength |
| Answer» D. Young's modulus to the ultimate tensile strength | |
| 698. |
_The railway carriage couplings have$? |
| A. | Square threads |
| B. | Acme threads |
| C. | Knuckle threads |
| D. | Buttress threads |
| Answer» E. | |
| 699. |
_The constant factor in case of R10 series of preferred numbers is$? |
| A. | 1.06 |
| B. | 1.12 |
| C. | 1.26 |
| D. | 1.58 |
| Answer» D. 1.58 | |
| 700. |
_Elastic nut is a locking device in which$? |
| A. | One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming |
| B. | A slot is cut partly in middle of nut and then slot reduced by tightening a screw |
| C. | Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip |
| D. | Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end |
| Answer» D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end | |