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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.
| 601. |
_ The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called$? |
| A. | Working depth |
| B. | Clearance |
| C. | Backlash |
| D. | Face width |
| Answer» D. Face width | |
| 602. |
_ While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as$? |
| A. | Both the ends fixed |
| B. | Both the ends hinged |
| C. | One end fixed and the other end hinged |
| D. | One end fixed and the other end free |
| Answer» E. | |
| 603. |
_ Which of the following material has the maximum ductility?$? |
| A. | Copper |
| B. | Mild steel |
| C. | Aluminium |
| D. | Zinc |
| Answer» C. Aluminium | |
| 604. |
_ In a multiple V-belt drive, if one of the belts break, then$? |
| A. | Only the broken belt is replaced |
| B. | The entire set of belts is replaced |
| C. | The broken belt and the belt on either side of it, is replaced |
| D. | The broken belt need not to be replaced |
| Answer» C. The broken belt and the belt on either side of it, is replaced | |
| 605. |
_ In a steam engine, the valve rod is connected to an eccentric rod by means of$? |
| A. | Cotter joint |
| B. | Knuckle joint |
| C. | Universal joint |
| D. | Flange coupling |
| Answer» C. Universal joint | |
| 606. |
_ The rocker arms in internal combustion engines are of__________.$? |
| A. | First type levers |
| B. | Second type levers |
| C. | Third type levers |
| D. | None of these |
| Answer» B. Second type levers | |
| 607. |
_ Wire ropes as compared to cotton ropes$? |
| A. | Are lighter in weight |
| B. | Offer silent operation |
| C. | Can withstand shock loads |
| D. | All of these |
| Answer» E. | |
| 608. |
_ Stress concentration factor is defined as the ratio of$? |
| A. | Maximum stress to the endurance limit |
| B. | Nominal stress to the endurance limit |
| C. | Maximum stress to the nominal stress |
| D. | Nominal stress to the maximum stress |
| Answer» D. Nominal stress to the maximum stress | |
| 609. |
_ When a close coiled helical spring is compressed, its wire is subjected to$? |
| A. | Tension |
| B. | Shear |
| C. | Compression |
| D. | All of the above |
| Answer» B. Shear | |
| 610. |
_ The dedendum is the radial distance from the$? |
| A. | Pitch circle to the top of a tooth |
| B. | Pitch circle to the bottom of a tooth |
| C. | Top of a tooth to the bottom of a tooth |
| D. | Addendum circle to the clearance circle |
| Answer» C. Top of a tooth to the bottom of a tooth | |
| 611. |
_ According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by$? |
| A. | Equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | Equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | Equating shearing resistance to the crushing resistance of the rivets |
| D. | None of the above |
| Answer» C. Equating shearing resistance to the crushing resistance of the rivets | |
| 612. |
_ Which of the following property is desirable in parts subjected to shock and impact loads?$? |
| A. | Strength |
| B. | Stiffness |
| C. | Brittleness |
| D. | Toughness |
| Answer» E. | |
| 613. |
_ The process which improves the machinability of steels, but lowers the hardness and tensile strength is$? |
| A. | Normalising |
| B. | Full annealing |
| C. | Process annealing |
| D. | Spheroidising |
| Answer» E. | |
| 614. |
_ Slenderness ratio is the ratio of$? |
| A. | Effective length of column to least radius of gyration of the column |
| B. | Width of column to depth of column |
| C. | Maximum size of column to minimum size of column |
| D. | Effective length of column to width of column |
| Answer» B. Width of column to depth of column | |
| 615. |
_ A column is known as a long column if the slenderness ratio is$? |
| A. | 40 |
| B. | 50 |
| C. | 70 |
| D. | 100 |
| Answer» E. | |
| 616. |
_ When a helical compression spring is cut into halves, the stiffness of the resulting spring will be$? |
| A. | Same |
| B. | Double |
| C. | One-half |
| D. | One-fourth |
| Answer» C. One-half | |
| 617. |
_ In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.$? |
| A. | Right hand |
| B. | Left hand |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 618. |
_ In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.$? |
| A. | Larger than |
| B. | Smaller than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 619. |
_ A crankshaft is a __________ shaft.$? |
| A. | Transmission |
| B. | Machine |
| C. | Machine frame |
| D. | None of these |
| Answer» C. Machine frame | |
| 620. |
_ A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,$? |
| A. | Hollow saddle key |
| B. | Hollow key |
| C. | Soft key |
| D. | None of these |
| Answer» B. Hollow key | |
| 621. |
_ The rolling contact bearings as compared to sliding contact bearings have$? |
| A. | Low starting and low running friction except at very high speeds |
| B. | Accuracy of shaft alignment |
| C. | Small overall dimensions |
| D. | All of the above |
| Answer» D. All of the above | |
| 622. |
_ Which one of the following is a positive drive?$? |
| A. | V-belt drive |
| B. | Rope drive |
| C. | Crossed flat belt drive |
| D. | Chain drive |
| Answer» E. | |
| 623. |
_ The resultant axial load on a bolt depends on$? |
| A. | Initial tension |
| B. | External load applied |
| C. | Relative elastic yielding (springness) of the bolt and the connected member |
| D. | All of the above |
| Answer» E. | |
| 624. |
_ The designation M 33 √ó 2 of a bolt means$? |
| A. | Metric threads of 33 numbers in 2 cm |
| B. | Metric threads with cross-section of 33 mm |
| C. | Metric threads of 33 mm outside diameter and 2 mm pitch |
| D. | Bolt of 33 mm nominal diameter having 2 threads per cm |
| Answer» D. Bolt of 33 mm nominal diameter having 2 threads per cm | |
| 625. |
_ A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called$? |
| A. | Ring nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Jam nut |
| Answer» B. Castle nut | |
| 626. |
_ Taper on the cotter and slot is provided$? |
| A. | On both the sides |
| B. | On one side only |
| C. | On none of the sides |
| D. | May be provided anywhere |
| Answer» C. On none of the sides | |
| 627. |
_ In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called$? |
| A. | Normal pitch |
| B. | Axial pitch |
| C. | Diametral pitch |
| D. | Module |
| Answer» C. Diametral pitch | |
| 628. |
_ The form factor of a helical gear __________ with the increase in the helix angle.$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of these |
| Answer» B. Decreases | |
| 629. |
_ The function of the washer is to$? |
| A. | Fill up the axial gap |
| B. | Provide bearing area |
| C. | Provide cushioning effect |
| D. | Absorb shocks and vibrations |
| Answer» C. Provide cushioning effect | |
| 630. |
_ The square threads are usually found on$? |
| A. | Spindles of bench vices |
| B. | Railway carriage couplings |
| C. | Feed mechanism of machine tools |
| D. | Screw cutting lathes |
| Answer» D. Screw cutting lathes | |
| 631. |
__A key way lowers__ |
| A. | The strength of the shaft |
| B. | The rigidity of the shaft |
| C. | Both the strength and rigidity of the shaft |
| D. | The ductility of the shaft |
| Answer» D. The ductility of the shaft | |
| 632. |
__A bolt__ |
| A. | Has a head on one end and a nut fitted to the other |
| B. | Has head at one end and other end fits into a tapped hole in the other part to be joined |
| C. | Has both the ends threaded |
| D. | Is provided with pointed threads |
| Answer» B. Has head at one end and other end fits into a tapped hole in the other part to be joined | |
| 633. |
__If a spring is cut down into two springs, the stiffness of cut springs will be__ |
| A. | Half |
| B. | Same |
| C. | Double |
| D. | None of the above |
| Answer» D. None of the above | |
| 634. |
__A rivet is specified by__ |
| A. | Shank diameter |
| B. | Length of rivet |
| C. | Type of head |
| D. | Length of tail |
| Answer» B. Length of rivet | |
| 635. |
__The arms of the pulleys for flat belt drive have__ |
| A. | Elliptical cross-section |
| B. | Major axis in plane of rotation |
| C. | Major axis twice the minor axis |
| D. | All the three characteristics |
| Answer» E. | |
| 636. |
__In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)__ |
| A. | 2 d |
| B. | 3 d |
| C. | 4 d |
| D. | 5 d |
| Answer» C. 4 d | |
| 637. |
__In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be__ |
| A. | 0.96 |
| B. | 0.97 |
| C. | 0.98 |
| D. | 0.99 |
| Answer» B. 0.97 | |
| 638. |
__When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be__ |
| A. | 0.8 d |
| B. | 1.2 d |
| C. | 1.57 d |
| D. | 1.8 d |
| Answer» D. 1.8 d | |
| 639. |
__The maximum efficiency of a square threaded screw is__ |
| A. | (1 - sinφ)/ (1 + sinφ) |
| B. | (1 + sinφ)/ (1 - sinφ) |
| C. | (1 - sinφ)/ (1 + cosφ) |
| D. | (1 + cosφ)/ (1 - sinφ) |
| Answer» B. (1 + sin≈ì√ú)/ (1 - sin≈ì√ú) | |
| 640. |
__If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will__ |
| A. | Have same value as that of standard specimen |
| B. | Increase |
| C. | Decrease |
| D. | None of these |
| Answer» D. None of these | |
| 641. |
__If two springs are in parallel then their overall stiffness will be__ |
| A. | Half |
| B. | Same |
| C. | Double |
| D. | None of the above |
| Answer» D. None of the above | |
| 642. |
__In case of thick cylinders, the tangential stress across the thickness of cylinder is__ |
| A. | Maximum at the outer surface and minimum at the inner surface |
| B. | Maximum at the inner surface and minimum at the outer surface |
| C. | Maximum at the inner surface and zero at the outer surface |
| D. | Maximum at the outer surface and zero at the inner surface |
| Answer» C. Maximum at the inner surface and zero at the outer surface | |
| 643. |
__When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))__ |
| A. | ‚à ö(Pmax / 2m) |
| B. | ‚à ö(Pmax / 3m) |
| C. | ‚à ö(Pmax / m) |
| D. | ‚à ö(3m /Pmax) |
| Answer» C. ‚Äö√ √∂(Pmax / m) | |
| 644. |
__Set screws are__ |
| A. | Similar to small size tap bolts except that a greater variety of shapes of heads are available |
| B. | Slotted for a screw driver and generally used with a nut |
| C. | Used to prevent relative motion between parts |
| D. | Similar to stud |
| Answer» D. Similar to stud | |
| 645. |
_The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)$? |
| A. | d/8 |
| B. | d/6 |
| C. | d/4 |
| D. | d/2 |
| Answer» D. d/2 | |
| 646. |
_In the levers of first type, the mechanical advantage is ________ one.$? |
| A. | Less than |
| B. | Equal to |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 647. |
_In designing thick cylinders, the equation used is$? |
| A. | Lame's equation |
| B. | Birnie's equation |
| C. | Clavarinos' equation |
| D. | All of these |
| Answer» E. | |
| 648. |
_The property of a material which enables it to be drawn into wires with the application of a tensile force, is called$? |
| A. | Plasticity |
| B. | Elasticity |
| C. | Ductility |
| D. | Malleability |
| Answer» D. Malleability | |
| 649. |
_The size of a cam depends upon$? |
| A. | Base circle |
| B. | Pitch circle |
| C. | Prime circle |
| D. | Pitch curve |
| Answer» B. Pitch circle | |
| 650. |
_The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for$? |
| A. | Reducing stress concentration |
| B. | Ease of manufacture |
| C. | Safety |
| D. | Fullering and caulking |
| Answer» E. | |