MCQOPTIONS
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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.
| 551. |
_ In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.$? |
| A. | Half |
| B. | Twice |
| C. | Thrice |
| D. | None of these |
| Answer» B. Twice | |
| 552. |
_ The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)$? |
| A. | Gd‚Å¥/ 8D3n |
| B. | Gd3/ 8D3n |
| C. | Gd‚Å¥/ 4D3n |
| D. | Gd⁴/ 8D²n |
| Answer» B. Gd3/ 8D3n | |
| 553. |
_ According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than$? |
| A. | d |
| B. | 1.5 d |
| C. | 2 d |
| D. | 2.5 d |
| Answer» D. 2.5 d | |
| 554. |
_ Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.$? |
| A. | Elastic strength |
| B. | Yield strength |
| C. | Shear strength |
| D. | None of these |
| Answer» C. Shear strength | |
| 555. |
_ The pipe joint mostly used for pipes carrying water at low pressures is$? |
| A. | Socket joint |
| B. | Nipple joint |
| C. | Union joint |
| D. | Spigot and socket joint |
| Answer» B. Nipple joint | |
| 556. |
_ When the fulcrum is in between the load and effort, the lever is said to be of$? |
| A. | First type |
| B. | Second type |
| C. | Third type |
| D. | Any one of these |
| Answer» B. Second type | |
| 557. |
_ The period during which the cam follower remains at rest, when cam moves, is known as$? |
| A. | Constant period |
| B. | Fixed period |
| C. | Dwell period |
| D. | Idle period |
| Answer» D. Idle period | |
| 558. |
_ According to Rankine's theory, the failure occurs at a point in a member$? |
| A. | When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test |
| B. | When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test |
| C. | When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test |
| D. | When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test |
| Answer» C. When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test | |
| 559. |
_ The material commonly used for crane hooks is$? |
| A. | Cast iron |
| B. | Wrought iron |
| C. | Mild steel |
| D. | Aluminium |
| Answer» C. Mild steel | |
| 560. |
_ Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is$? |
| A. | F + P |
| B. | F.P |
| C. | P |
| D. | F |
| Answer» B. F.P | |
| 561. |
_ When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to$? |
| A. | (1/2) √ó ‚à ö(M¬≤ + T¬≤) |
| B. | ‚à ö(M¬≤ + T¬≤) |
| C. | (1/2) √ó [M + ‚à ö(M¬≤ + T¬≤)] |
| D. | M + ‚à ö(M¬≤ + T¬≤) |
| Answer» C. (1/2) ‚àö√≥ [M + ‚Äö√ √∂(M¬¨‚⧠+ T¬¨‚â§)] | |
| 562. |
_ Whether any core is required in wire ropes$? |
| A. | Yes |
| B. | No |
| C. | Sometimes |
| D. | Rarely |
| Answer» B. No | |
| 563. |
_ The draw of cotter need not exceed$? |
| A. | 3 mm |
| B. | 5 mm |
| C. | 10 mm |
| D. | 20 mm |
| Answer» B. 5 mm | |
| 564. |
_ The algebraic difference between the maximum limit and the basic size is called$? |
| A. | Lower deviation |
| B. | Upper deviation |
| C. | Actual deviation |
| D. | Mean deviation |
| Answer» C. Actual deviation | |
| 565. |
_ The included angle between the sides of V-belt is$? |
| A. | 40° |
| B. | 45° |
| C. | 38° |
| D. | 60° |
| Answer» B. 45¬¨‚àû | |
| 566. |
_ A locking device extensively used in automobile industry is a$? |
| A. | Jam nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Ring nut |
| Answer» C. Sawn nut | |
| 567. |
_ A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is$? |
| A. | 3.6 N/mm² compression |
| B. | 3.6 N/mm² tension |
| C. | 7.2 N/mm² compression |
| D. | 7.2 N/mm² tension |
| Answer» D. 7.2 N/mm¬¨‚⧠tension | |
| 568. |
_ In the levers of __________ type, the mechanical advantage is less than one.$? |
| A. | First |
| B. | Second |
| C. | Third |
| D. | None of these |
| Answer» D. None of these | |
| 569. |
_ A screw is said to be over hauling screw, if the$? |
| A. | Friction angle is less than helix angle |
| B. | Friction angle is more than helix angle |
| C. | Friction angle is equal to helix angle |
| D. | Efficiency of screw is 100% |
| Answer» B. Friction angle is more than helix angle | |
| 570. |
_ The included angle for the British standard whitworth thread is$? |
| A. | 29° |
| B. | 47.5° |
| C. | 55° |
| D. | 60° |
| Answer» D. 60¬¨‚àû | |
| 571. |
_ A tapered key which fits in a key way in the hub and is flat on the shaft, is known as$? |
| A. | Feather key |
| B. | Gib-head key |
| C. | Wood ruff key |
| D. | Flat saddle key |
| Answer» E. | |
| 572. |
_ Guest's theory is used for$? |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Elastic materials |
| D. | Plastic materials |
| Answer» C. Elastic materials | |
| 573. |
_ If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to$? |
| A. | Diameter of bolt |
| B. | 0.75 √ó diameter of bolt |
| C. | 1.25 √ó diameter of bolt |
| D. | 1.5 √ó diameter of bolt |
| Answer» B. 0.75 ‚àö√≥ diameter of bolt | |
| 574. |
_ In radial cams, the follower moves$? |
| A. | In a direction parallel to the cam axis |
| B. | In a direction perpendicular to the cam axis |
| C. | In any direction irrespective of cam axis |
| D. | Along the cam axis |
| Answer» C. In any direction irrespective of cam axis | |
| 575. |
_ If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» D. None of these | |
| 576. |
_ According to Indian standards, total numbers of tolerance grades are$? |
| A. | 8 |
| B. | 12 |
| C. | 18 |
| D. | 20 |
| Answer» D. 20 | |
| 577. |
_ The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called$? |
| A. | Repeated stress |
| B. | Yield stress |
| C. | Fluctuating stress |
| D. | Alternating stress |
| Answer» D. Alternating stress | |
| 578. |
_ The application of third type levers is found in$? |
| A. | A pair of tongs |
| B. | Hand wheel of a punching press |
| C. | Lever of a loaded safety valve |
| D. | Handle of a hand pump |
| Answer» B. Hand wheel of a punching press | |
| 579. |
_ The shear stress at a point in a shaft subjected to a torque is$? |
| A. | Directly proportional to the polar moment of inertia and to the distance of the point from the axis |
| B. | Directly proportional to the applied torque and inversely proportional to the polar moment of inertia |
| C. | Directly proportional to the applied torque and the polar moment of inertia |
| D. | Inversely proportional to the applied torque and the polar moment of inertia |
| Answer» C. Directly proportional to the applied torque and the polar moment of inertia | |
| 580. |
_ Which of the following screw thread is adopted for power transmission in either direction?$? |
| A. | Acme threads |
| B. | Square threads |
| C. | Buttress threads |
| D. | Multiple threads |
| Answer» C. Buttress threads | |
| 581. |
_ The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to (Where, Pc = tension in belt due to centrifugal force)$? |
| A. | 3 Pc |
| B. | 1 Pc |
| C. | Pc/3 |
| D. | 2 Pc |
| Answer» B. 1 Pc | |
| 582. |
_ Crowning on pulley helps$? |
| A. | In decreasing the slip of the belt |
| B. | In increasing the slip of the belt |
| C. | To keep the belt in centre on a pulley while it is in motion |
| D. | To increase pulley life |
| Answer» D. To increase pulley life | |
| 583. |
_ Gear box is used$? |
| A. | To produce torque |
| B. | For speed reduction |
| C. | To obtain variable speeds |
| D. | To increase efficiency of system |
| Answer» D. To increase efficiency of system | |
| 584. |
_ The distribution of the forces along the length of key fitted in a shaft$? |
| A. | Varies linearly |
| B. | Is uniform throughout |
| C. | Varies exponentially, being more near the torque-input end |
| D. | Varies exponentially, being less near the torque-input end |
| Answer» D. Varies exponentially, being less near the torque-input end | |
| 585. |
_ When the speed of belt increases,$? |
| A. | The coefficient of friction between the belt and pulley decreases |
| B. | The coefficient of friction between the belt and pulley increases |
| C. | The power transmitted will decrease |
| D. | The power transmitted will increase |
| Answer» D. The power transmitted will increase | |
| 586. |
_ If a material fails below its yield point, failure would be due to$? |
| A. | Straining |
| B. | Fatigue |
| C. | Creep |
| D. | Sudden loading |
| Answer» C. Creep | |
| 587. |
_ The cam follower generally used in automobile engines is$? |
| A. | Knife edge follower |
| B. | Flat faced follower |
| C. | Spherical faced follower |
| D. | Roller follower |
| Answer» D. Roller follower | |
| 588. |
_ The temperature at which the new grains are formed in the metal is known as$? |
| A. | Lower critical temperature |
| B. | Upper critical temperature |
| C. | Recrystallization temperature |
| D. | None of these |
| Answer» D. None of these | |
| 589. |
_ Which of the following is a permanent fastening?$? |
| A. | Bolts |
| B. | Keys |
| C. | Cotters |
| D. | Rivets |
| Answer» E. | |
| 590. |
_ A hollow saddle key is$? |
| A. | A taper key which fits half in the key way of hub and half in the key way of shaft |
| B. | A taper key which fits in a key way of the hub and is flat on the shaft |
| C. | A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft |
| D. | Provided in pairs at right angles and each key is to withstand torsion in one direction only |
| Answer» D. Provided in pairs at right angles and each key is to withstand torsion in one direction only | |
| 591. |
_ The lead angle of a worm is 22.5°. Its helix angle will be$? |
| A. | 22.5° |
| B. | 45° |
| C. | 67.5° |
| D. | 90° |
| Answer» D. 90¬¨‚àû | |
| 592. |
_ According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be$? |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» E. | |
| 593. |
_ According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be$? |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» D. 80 to 90% | |
| 594. |
_ The angle of twist of shaft is$? |
| A. | Directly proportional to (shaft diameter)² |
| B. | Inversely proportional to (shaft diameter)² |
| C. | Directly proportional to (shaft diameter)‚Å¥ |
| D. | Inversely proportional to (shaft diameter)‚Å¥ |
| Answer» E. | |
| 595. |
_ If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as$? |
| A. | b/L |
| B. | b/2L |
| C. | 1 - 2 b.L |
| D. | 1 - (b/L) |
| Answer» E. | |
| 596. |
_ Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to$? |
| A. | Dynamic loading |
| B. | Static loading |
| C. | Combined static and dynamic loading |
| D. | Completely reversed loading |
| Answer» E. | |
| 597. |
_ The rivet head used for boiler plate riveting is usually$? |
| A. | Pan Head |
| B. | Snap head |
| C. | Counter sunk head |
| D. | Conical head |
| Answer» C. Counter sunk head | |
| 598. |
_ Coaxing is the procedure of increasing$? |
| A. | Metal strength by cycling |
| B. | Metal hardness by surface treatment |
| C. | Metal resistance to corrosion by coating |
| D. | Fatigue limit by over-stressing the metal by successively increasing loadings |
| Answer» E. | |
| 599. |
_ In a hydrodynamic lubricated bearing$? |
| A. | There is a thick film of lubricant between the journal and the bearing |
| B. | There is a thin film of lubricant between the journal and the bearing |
| C. | The lubricant is forced between the journal and the bearing, by external pressure |
| D. | There is no lubricant between the journal and the bearing |
| Answer» B. There is a thin film of lubricant between the journal and the bearing | |
| 600. |
_ The resilience of a bolt may be increased by$? |
| A. | Increasing its shank diameter |
| B. | Increasing its length |
| C. | Decreasing its shank diameter |
| D. | Decreasing its length |
| Answer» C. Decreasing its shank diameter | |