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.
| 451. |
*/*_Surface endurance limit of gear material is dependent upon its? |
| A. | Elastic strength |
| B. | Yield strength |
| C. | Brinell hardness number |
| D. | Toughness |
| Answer» D. Toughness | |
| 452. |
*/*_A bench vice has following type of threads? |
| A. | Metric |
| B. | Square |
| C. | Buttress |
| D. | Acme |
| Answer» E. | |
| 453. |
*/*_The centre distance between two meshing involute gears is equal to? |
| A. | Sum of base circle radii/cosφ |
| B. | Difference of base circle radii/cosφ |
| C. | Sum of pitch circle radii/cosφ |
| D. | Difference of pitch circle radii/cosφ |
| Answer» B. Difference of base circle radii/cos≈ì√ú | |
| 454. |
*/*_The ratio of driving tensions in V-belt drives is __________ flat belt drives.? |
| A. | Equal to |
| B. | sin α times more than |
| C. | sin α times less than |
| D. | cosec α times more than |
| Answer» E. | |
| 455. |
*/*_Split nut is a locking device in which? |
| A. | One smaller 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 screw |
| C. | A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed 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 the other end |
| Answer» C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip | |
| 456. |
*/*_For unequal width of butt straps, the thicknesses of butt straps are? |
| A. | 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside |
| B. | 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside |
| C. | 0.75 t for both the straps on the inside and outside |
| D. | 0.625 t for both the straps on the inside and outside |
| Answer» C. 0.75 t for both the straps on the inside and outside | |
| 457. |
*/*_In a steam engine, the piston rod is usually connected to the cross-head by means of a? |
| A. | Knuckle joint |
| B. | Cotter joint |
| C. | Oldham coupling |
| D. | Universal joint |
| Answer» C. Oldham coupling | |
| 458. |
*/*_Pick up wrong statement. Fatigue strength can be increased by? |
| A. | Cold working |
| B. | Shot peening |
| C. | Grinding and lapping surface |
| D. | Hot working |
| Answer» E. | |
| 459. |
*/*_The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to? |
| A. | T/2 |
| B. | 1 T |
| C. | 2 T |
| D. | 4 T |
| Answer» B. 1 T | |
| 460. |
*/*_For general industrial machinery, the ratio of the length of journal to its diameter is taken as? |
| A. | 0.5 to 1 |
| B. | 1 to 2 |
| C. | 3 to 5 |
| D. | 5 to 10 |
| Answer» C. 3 to 5 | |
| 461. |
*/*_The helix angle for double helical gears may be made up to? |
| A. | 45° |
| B. | 60° |
| C. | 75° |
| D. | 90° |
| Answer» B. 60¬¨‚àû | |
| 462. |
*/*_When spring index increases, the value of Wahl's stress factor? |
| A. | Increases linearly |
| B. | Decreases linearly |
| C. | Remains same |
| D. | Increases exponentially |
| Answer» E. | |
| 463. |
*/*_The cross-section of the arm of a bell crank lever is? |
| A. | Rectangular |
| B. | Elliptical |
| C. | I-section |
| D. | Any one of these |
| Answer» E. | |
| 464. |
*/*_Fabric belts are used in industrial applications because? |
| A. | They are cheap |
| B. | They can work at high temperature |
| C. | They are unaffected by moisture and humidity |
| D. | None of the above |
| Answer» B. They can work at high temperature | |
| 465. |
*/*_In a marine flange coupling, the thickness of flange is taken as? |
| A. | d/2 |
| B. | d/3 |
| C. | 3d/4 |
| D. | d/4 |
| Answer» C. 3d/4 | |
| 466. |
*/*_The ratio of the ultimate stress to the design stress is known as? |
| A. | Elastic limit |
| B. | Strain |
| C. | Factor of safety |
| D. | Bulk modulus |
| Answer» D. Bulk modulus | |
| 467. |
*/*_The objective of caulking in a riveted joint is to make the joint? |
| A. | Free from corrosion |
| B. | Stronger in tension |
| C. | Free from stress |
| D. | Leak-proof |
| Answer» E. | |
| 468. |
*/*_In skew bevel gearing, the axes of shafts are? |
| A. | Intersecting and the teeth are curved |
| B. | Non-intersecting and nonparallel and the teeth are curved |
| C. | Non-intersecting and non-parallel and the teeth are straight |
| D. | None of the above |
| Answer» D. None of the above | |
| 469. |
*/*_The ball bearings are provided with a cage? |
| A. | To reduce friction |
| B. | To facilitate slipping of balls |
| C. | To prevent the lubricant from flowing out |
| D. | To maintain the balls at a fixed distance apart |
| Answer» E. | |
| 470. |
*/*_In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.? |
| A. | 90° |
| B. | 135° |
| C. | 160° |
| D. | 180° |
| Answer» B. 135¬¨‚àû | |
| 471. |
*/*_Idler pulley is used for? |
| A. | Increasing velocity ratio |
| B. | For applying tension |
| C. | Changing the direction of motion of belt |
| D. | All of these |
| Answer» C. Changing the direction of motion of belt | |
| 472. |
*/*_When a metal or alloy is cold worked,? |
| A. | Its hardness and strength increases |
| B. | It is worked below recrystallization temperature |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 473. |
*/*_In nitrated parts, the origins of the fatigue cracks will occur at? |
| A. | Surface |
| B. | Just below the surface |
| C. | Within the core |
| D. | None of the above |
| Answer» E. | |
| 474. |
*/*_At low temperatures (say 75°C) the notched bar impact value of steel? |
| A. | Increases markedly |
| B. | Decreases markedly |
| C. | Remain same |
| D. | Depends on heat treatment carried out |
| Answer» C. Remain same | |
| 475. |
*/*_In radial bearings, the load acts __________ to the axis of rotation.? |
| A. | Parallel |
| B. | Perpendicular |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 476. |
*/*_The resultant axial load on a bolt depends upon? |
| A. | External load applied |
| B. | Initial tension due to tightening of the bolt |
| C. | Relative elastic yielding of the bolt and the connected members |
| D. | All of the above |
| Answer» E. | |
| 477. |
*/*_An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by? |
| A. | Increasing the length of bar |
| B. | Decreasing the cross-sectional area of the bar |
| C. | Decreasing the modulus of elasticity of the bar |
| D. | All of the above |
| Answer» E. | |
| 478. |
*/*_Gears are casted by? |
| A. | Sand mould casting |
| B. | Slush casting |
| C. | Permanent mould casting |
| D. | Centrifugal casting |
| Answer» D. Centrifugal casting | |
| 479. |
*/*_In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of? |
| A. | Combined effect of transverse shear stress and bending stress in the wire |
| B. | Combined effect of bending stress and curvature of the wire |
| C. | Combined effect of transverse shear stress and curvature of wire |
| D. | Combined effect of torsional shear stress and transverse shear stress in the wire |
| Answer» C. Combined effect of transverse shear stress and curvature of wire | |
| 480. |
*/*_If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation? |
| A. | 124 d |
| B. | 138 d |
| C. | 151 d |
| D. | 168 d |
| Answer» E. | |
| 481. |
*/*_In levers, leverage is the ratio of? |
| A. | Load lifted to the effort applied |
| B. | Mechanical advantage to the velocity ratio |
| C. | Load arm to the effort arm |
| D. | Effort arm to the load arm |
| Answer» E. | |
| 482. |
*/*_If threads on a bolt are left hand, threads on nut will be? |
| A. | Right hand with same pitch |
| B. | Left hand with same pitch |
| C. | Could be left or right hand |
| D. | Right hand with fine pitch |
| Answer» C. Could be left or right hand | |
| 483. |
*/*_According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the 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» D. None of the above | |
| 484. |
*/*_The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)? |
| A. | T₁/T₂ = μθ |
| B. | log (T₁/T₂) = μθ |
| C. | T₁/T₂ =eμθ |
| D. | T₁/T₂ = log μθ |
| Answer» D. T‚Äö√á√Ö/T‚Äö√á√á = log ≈í¬∫≈í‚àè | |
| 485. |
*/*_When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is? |
| A. | 0.20 |
| B. | 0.35 |
| C. | 0.50 |
| D. | 0.65 |
| Answer» D. 0.65 | |
| 486. |
*/*_The contact ratio is the ratio of? |
| A. | Length of arc of recess to the circular pitch |
| B. | Length of path of contact to the circular pitch |
| C. | Length of arc of contact to the circular pitch |
| D. | Length of arc of approach to the circular pitch |
| Answer» D. Length of arc of approach to the circular pitch | |
| 487. |
*/*_Euler’s formula for a mild steel column is not valid if the slenderness ratio is? |
| A. | 90 |
| B. | 60 |
| C. | 120 |
| D. | 100 |
| Answer» C. 120 | |
| 488. |
*/*_The design of pin of a rocker arm of an I.C. engine is based on? |
| A. | Bearing failure |
| B. | Shearing failure |
| C. | Bending failure |
| D. | All of these |
| Answer» E. | |
| 489. |
*/*_The pitch diameter is the __________ diameter of an external or internal screw thread.? |
| A. | Effective |
| B. | Smallest |
| C. | Largest |
| D. | None of these |
| Answer» B. Smallest | |
| 490. |
*/*_Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.? |
| A. | Twice |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» D. Sixteen times | |
| 491. |
*/*_A single strap butt joint is always in __________ shear.? |
| A. | Single |
| B. | Double |
| C. | Triple share |
| D. | None of these |
| Answer» B. Double | |
| 492. |
*/*_In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because? |
| A. | Belts are available in sets |
| B. | Only one belt cannot be fitted with other used belts |
| C. | The new belt will carry more than its share and result in short life |
| D. | New and old belts will cause vibrations |
| Answer» D. New and old belts will cause vibrations | |
| 493. |
*/*_For tight leakage joints, following type of thread is best suited? |
| A. | Metric |
| B. | Buttress |
| C. | Square |
| D. | NPT (national pipe threads). |
| Answer» E. | |
| 494. |
*/*_A stud? |
| 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. | Has pointed threads |
| Answer» D. Has pointed threads | |
| 495. |
*/*_Which of the following formula is used in designing a connecting rod?? |
| A. | Euler's formula |
| B. | Rankine's formula |
| C. | Johnson's straight line formula |
| D. | Johnson's parabolic formula |
| Answer» C. Johnson's straight line formula | |
| 496. |
*/*_A bolt of M 24 √ó 2 means that? |
| A. | The pitch of the thread is 24 mm and depth is 2 mm |
| B. | Cross-sectional area of the threads is 24 mm² |
| C. | The nominal diameter of bolt is 24 mm and pitch is 2 mm |
| D. | The effective diameter of bolt is 24 mm and there are 2 threads per cm |
| Answer» D. The effective diameter of bolt is 24 mm and there are 2 threads per cm | |
| 497. |
*/*_A screw will be self locking, if? |
| 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» C. Friction angle is equal to helix angle | |
| 498. |
*/*_The washer is generally specified by its? |
| A. | Outer diameter |
| B. | Hole diameter |
| C. | Thickness |
| D. | Mean diameter |
| Answer» C. Thickness | |
| 499. |
*/*_The centrifugal tension in belts? |
| A. | Decreases the power transmitted |
| B. | Increases the power transmitted |
| C. | Increase the wrap angle |
| D. | Increases the belt tension without increasing power transmission |
| Answer» E. | |
| 500. |
*/*_A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be? |
| A. | 5 mm |
| B. | 10 mm |
| C. | 15 mm |
| D. | 25 mm |
| Answer» E. | |