McqMate
| 1. |
The type of cam used for low and moderate speed engines is generally |
| A. | Involute |
| B. | Harmonic |
| C. | Flat |
| D. | Cylindrical |
| E. | Tangent |
| Answer» B. Harmonic | |
| 2. |
Which material is expected to be the hardest? |
| A. | Brass |
| B. | Copper-zinc |
| C. | Molybdenum |
| D. | Silver |
| E. | Aluminium |
| Answer» C. Molybdenum | |
| 3. |
If machine number is loaded in such a way that the three principla stresses at a point are 600 kg/cm2 compression. 800 kg/cm2 tension and zero. The maximum shear stress at the point will be |
| A. | 700 kg/cm2 |
| B. | 600 kg/cm2 |
| C. | 1000 kg/cm2 |
| D. | 800 kg/cm2 |
| E. | 200 kg/cm2 |
| Answer» A. 700 kg/cm2 | |
| 4. |
For minimum noise use which type of gears are used |
| A. | Bevel gears |
| B. | Hypoid gears |
| C. | Helical gears |
| D. | Cast steel |
| E. | Spur gears |
| Answer» C. Helical gears | |
| 5. |
In cross or regular lay ropes |
| A. | The direction of twist in wires in strands is opposite to the direction of twist of strands |
| B. | The direction of twist in wires in strands is the same as the direction of twist of strands |
| C. | Wires in two adjacent strands are twisted in opposite direction |
| D. | Wires are never twisted |
| E. | Only one wire is twisted and wrapped around |
| Answer» A. The direction of twist in wires in strands is opposite to the direction of twist of strands | |
| 6. |
In case of sunk key |
| A. | The key way is helical along the shaft |
| B. | The key way is cut in bub only |
| C. | The key way is cut in both shaft and hub |
| D. | The key way is cut in shaft only |
| E. | The key is in two parts |
| Answer» C. The key way is cut in both shaft and hub | |
| 7. |
The included angle of American National threads is |
| A. | 55? |
| B. | 50? |
| C. | 29? |
| D. | 47 |
| E. | 60? |
| Answer» E. 60? | |
| 8. |
Which of the following statement is false? |
| A. | Ball and roller bearings are anti-friction bearings |
| B. | The sleeve of a muff coupling is designed as a solid shaft |
| C. | In designing gear, the tooth is considered as a cantilever subjected to an end load |
| D. | Buttress threads are used to transmit power in one direction only |
| E. | Increasing the diameter of threaded portion |
| Answer» B. The sleeve of a muff coupling is designed as a solid shaft | |
| 9. |
Miter gears are |
| A. | Spur gears with same number of teeth |
| B. | Gears with different profiles |
| C. | Helical gears with same number of teeth |
| D. | Stepped spur gears |
| E. | Right angled bevel gears with same number of teeth |
| Answer» E. Right angled bevel gears with same number of teeth | |
| 10. |
Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because |
| A. | helical gears have some helix angle but the spur gears are straight |
| B. | there is end thrust in helical gears |
| C. | in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate | |
| 11. |
In the case of roller bearings the contacting areas between rollers and running tracks are |
| A. | Cast steel |
| B. | oblong |
| C. | parabolic |
| D. | elliptical |
| E. | circular |
| Answer» B. oblong | |
| 12. |
In door shutters, the type of the spring used is |
| A. | spiral spring |
| B. | helical torsion spring |
| C. | Cast steel |
| D. | close coiled helical spring |
| E. | conical helical spring |
| Answer» B. helical torsion spring | |
| 13. |
A foundation bolt with a circular end is secured to the floor by means of a steel cotter. If the pull on the bolt is 14000 kg, the diameter of the bolt should be |
| A. | Double shear |
| B. | 50 mm |
| C. | 10 mm |
| D. | 30 mm |
| E. | 20 mm |
| Answer» A. Double shear | |
| 14. |
The average values of modulus of rigidity for aluminium brass, copper and steel in descending order is |
| A. | Aluminium, nickel, brass, copper and steel |
| B. | Aluminium, copper, nickel, brass and steel |
| C. | Aluminium, copper, brass, nickel and steel |
| D. | Aluminium, brass, copper, nickel and steel |
| E. | Aluminium, brass, nickel, copper and steel |
| Answer» D. Aluminium, brass, copper, nickel and steel | |
| 15. |
In a ball bearing steel balls are made of |
| A. | Carbon steel |
| B. | Stainless steel |
| C. | Cast iron |
| D. | Carbon chrome steel |
| E. | Brass |
| Answer» D. Carbon chrome steel | |
| 16. |
In most machine members, the damping capacity of the material should be |
| A. | Anything |
| B. | Zero |
| C. | High |
| D. | Around zero |
| E. | Low |
| Answer» C. High | |
| 17. |
The loading on a pinion gear is usually |
| A. | Compression |
| B. | Tension |
| C. | Shear |
| D. | Cyclic loading |
| E. | None of the above |
| Answer» D. Cyclic loading | |
| 18. |
St, Venant's theory for failure of material is based on |
| A. | maximum shear stress |
| B. | maximum strain energy |
| C. | maximum tensile stress |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. maximum strain energy | |
| 19. |
The critical speed of a shaft is affected by |
| A. | Diameter of the disc |
| B. | Eccentricity |
| C. | Span of the shaft |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 20. |
A thin cylinder contains fluid at a pressure of 30 kg kg/cm2, the internal diameter of the shell is 60 cm and the tensile stress in the material is to be limited to 900 kg/cm2. The shell must have a minimum wall thickness of |
| A. | 10 mm |
| B. | 9 mm |
| C. | 1 mm |
| D. | 27 mm |
| E. | 12 mm |
| Answer» A. 10 mm | |
| 21. |
Stub tooth |
| A. | Has a profile which is involutic at the base and cycloidal at the top |
| B. | Has a profile which is cycloidal at the base and involutic at the top |
| C. | Is provided on racks only |
| D. | Has a profile shorter than the standard tooth |
| E. | Has a profile longer than the standard tooth |
| Answer» D. Has a profile shorter than the standard tooth | |
| 22. |
Approximate horse power that can be transmitted by a shaft 60 mm diameter at 180 r.p.m. with permissible shear stress of 850 kg/cm2, would be |
| A. | 35-50 |
| B. | 85-95 |
| C. | 30-35 |
| D. | 50-65 |
| E. | 65-85 |
| Answer» B. 85-95 | |
| 23. |
The differential equation 10x + 9 x + 810x = 0 describes a one degree of freedom system. The natural frequency of the system is |
| A. | 90 cycles per second |
| B. | 9 cycles per second |
| C. | 10 cycles per second |
| D. | 90 sycles per second |
| E. | 9 radians per second |
| Answer» E. 9 radians per second | |
| 24. |
The concentric helical springs are wound in opposite direction |
| A. | to maintain identical shear stress in the two springs |
| B. | Increasing the diameter of threaded portion |
| C. | to maintain identical stiffness in both springs |
| D. | to avoid unequal deflection in the two springs |
| E. | to avoid binding of adjacent coils |
| Answer» E. to avoid binding of adjacent coils | |
| 25. |
The rivet diameter should be |
| A. | More than plate thickness |
| B. | Less than the plate thickness |
| C. | Equal to the plate thickness |
| D. | Equal to the strap thickness |
| E. | Half the plate thickness |
| Answer» A. More than plate thickness | |
| 26. |
In a horizontal flat belt drive for power transmission it is customary to use |
| A. | bottom side of the belt as slack side |
| B. | top side of the belt as slack side |
| C. | crossed-belting |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. top side of the belt as slack side | |
| 27. |
Auto frettage is a |
| A. | extra cover provided on seamless pipes to increase their hoop stress |
| B. | a means of inducing favourable residual stresses in pressure vessels |
| C. | Increasing the diameter of threaded portion |
| D. | a heat treatment for pressure vessels subjected to low temperatures |
| E. | surface coating process |
| Answer» B. a means of inducing favourable residual stresses in pressure vessels | |
| 28. |
Bush bearings |
| A. | Phosphor bronze |
| B. | Aluminium bronze |
| C. | Mild steel |
| D. | White metal alloys |
| E. | None of the above |
| Answer» D. White metal alloys | |
| 29. |
In a standard coarse thread bolt the stress concentration is maximum at |
| A. | Top surface |
| B. | Pitch circle |
| C. | Root |
| D. | All over the surface |
| E. | Flank |
| Answer» C. Root | |
| 30. |
In case of worm and worm-wheel the maximum efficiency is obtained when |
| A. | Worm is driver |
| B. | Worm wheel is driver |
| C. | Either of the worm or worm wheel is a driver |
| D. | Depends on other factors |
| E. | None of the above |
| Answer» C. Either of the worm or worm wheel is a driver | |
| 31. |
When properly made, a butt weld has the strength equal to |
| A. | Double the tensile strength of plates |
| B. | Half the tensile strength of plates |
| C. | Half the compressive strength of plates |
| D. | The strength of the welded plates |
| E. | Double the compressive strength of plates |
| Answer» D. The strength of the welded plates | |
| 32. |
In case of steels, as the percentage of carbon content increases |
| A. | Percentage elongation decreases |
| B. | Weldability increases |
| C. | Tensile strength decreases |
| D. | Hardness decreases |
| E. | Tapered bearing |
| Answer» A. Percentage elongation decreases | |
| 33. |
At the first critical speed a shaft will |
| A. | Remain straight |
| B. | Bend to the simplest shape possible |
| C. | Bend to maximum permissible depth |
| D. | Bend to the convex form |
| E. | Vibrate producing audible sound |
| Answer» B. Bend to the simplest shape possible | |
| 34. |
In order to reverse the direction of rotation of a 3-phase induction motor |
| A. | Motor should eb replaced |
| B. | Power factor should be changed |
| C. | Supply voltage should be cut off in one phase |
| D. | Any two phases should be interchanged |
| E. | All the three phases should be interchanged |
| Answer» D. Any two phases should be interchanged | |
| 35. |
The basic hole is one which has |
| A. | Upper deviation as zero |
| B. | Lower deviation as zero |
| C. | Lower as well as upper deviation within narrow limits |
| D. | Lower as well as upper deviation are zero |
| E. | None of the above |
| Answer» B. Lower deviation as zero | |
| 36. |
In a Vee belt the angle between the sides is |
| A. | 30? |
| B. | 20? |
| C. | 60? |
| D. | 40? |
| E. | 10? |
| Answer» D. 40? | |
| 37. |
Gerber line for failure criteria is in the form of a |
| A. | parabola |
| B. | Increasing the diameter of threaded portion |
| C. | straight line with negative slope |
| D. | straight line with positive slope |
| E. | hyperbola |
| Answer» A. parabola | |
| 38. |
Which of the following formula for columns takes into account any initial crookedness of the column and imperfectness of axial loading? |
| A. | Secant formula |
| B. | Increasing the diameter of threaded portion |
| C. | Euler's formula |
| D. | Rankiness formula |
| E. | Perry Robertson formula |
| Answer» A. Secant formula | |
| 39. |
While designing a shaft pulley and key for a system |
| A. | Shaft is the weakest member |
| B. | Pulley is the weakest member |
| C. | Key is the weakest member |
| D. | All are designed for equal strength |
| E. | None of the above |
| Answer» C. Key is the weakest member | |
| 40. |
In case of biaxial stress system when a member is subjected to tensile stresses in two perpendicular directions the maximum shear stress in case of mild steel occurs on a plane inclined at |
| A. | 22 |
| B. | 75? |
| C. | 45? |
| D. | 67 |
| E. | 30? |
| Answer» C. 45? | |
| 41. |
For a bearing which of the following is maximum? |
| A. | Minimum life |
| B. | Average life |
| C. | Median life |
| D. | (A), (B) and (C) above are identical |
| E. | Increasing the diameter of threaded portion |
| Answer» C. Median life | |
| 42. |
The approximate value of allowable stress for carbon steel under static loading (in kg/cm2) is |
| A. | 500-1000 |
| B. | 10000-15000 |
| C. | 4000-7500 |
| D. | 20000-25000 |
| E. | 15000-20000 |
| Answer» C. 4000-7500 | |
| 43. |
Stub tooth is |
| A. | Longer than standard tooth depth |
| B. | Non-standard tooth |
| C. | Shorter than standard tooth depth |
| D. | Equivalent rack tooth |
| E. | Standard gear tooth |
| Answer» C. Shorter than standard tooth depth | |
| 44. |
Self-tapping screws are generally used in |
| A. | Shear metal work |
| B. | Machine tools |
| C. | Automobiles |
| D. | Aeroplanes |
| E. | None of the above |
| Answer» A. Shear metal work | |
| 45. |
Fatigue is mostly initiated at |
| A. | core |
| B. | centre |
| C. | Increasing the diameter of threaded portion |
| D. | surface |
| E. | core |
| Answer» D. surface | |
| 46. |
Which of the following joint is used for pipes carrying water under low pressures? |
| A. | Socket joint |
| B. | Increasing the diameter of threaded portion |
| C. | Expansion joint |
| D. | Adhesive joint |
| E. | Welded joint |
| Answer» A. Socket joint | |
| 47. |
In case of steels, as the percentage of carbon content increases |
| A. | Elongation increases |
| B. | Chrome steel |
| C. | Hardness decreases |
| D. | Tensile strength increases |
| E. | Weldability increases |
| Answer» D. Tensile strength increases | |
| 48. |
If screw threads are to be used in a situation involving high stresses in one direction only, the types of threads suitable for this would be |
| A. | BA |
| B. | BSW |
| C. | Buttress |
| D. | Acme |
| E. | Square |
| Answer» C. Buttress | |
| 49. |
A solderberg line for ductile material gives upper limit for |
| A. | Increasing the diameter of threaded portion |
| B. | alternating tensile stress |
| C. | alternating compressive stress |
| D. | any combination of mean and alternating stresses |
| E. | mean stress |
| Answer» D. any combination of mean and alternating stresses | |
| 50. |
If water in closed pipe freezes, the pipe will |
| A. | Rupture in a plane inclined at 45 degree to the longitudinal axis of the pipe |
| B. | Rupture along a line running longitudinally along the pipe |
| C. | Rupture along a plane perpendicular to the axis of pipe |
| D. | Rupture zig-zag along the length |
| E. | Rupture along weakest circumferential section |
| Answer» B. Rupture along a line running longitudinally along the pipe | |
| 51. |
A self-socking screw is one which |
| A. | Has locking arrangement |
| B. | Has a hole drilled through for inserting locking pin |
| C. | Has coefficient of friction equal to or greater than the tangent of the load angle |
| D. | Has fine pitch screw threads |
| E. | None of the above |
| Answer» C. Has coefficient of friction equal to or greater than the tangent of the load angle | |
| 52. |
A taper bearing has |
| A. | Tapered roller |
| B. | Tapered inner race |
| C. | Tapered shaft |
| D. | Tapered cage |
| E. | Tapered outer race |
| Answer» A. Tapered roller | |
| 53. |
Resistance to fatigue of a material is measured by |
| A. | Modulus of rigidity |
| B. | Electricity parameters |
| C. | Endurance limit |
| D. | Elastic limit |
| E. | Youngs modulus |
| Answer» C. Endurance limit | |
| 54. |
Wing screws are used where |
| A. | tight grip is essential |
| B. | frequently manual locking and unlocking is necessary |
| C. | stress reversal is severe |
| D. | high torque is needed for tightening |
| E. | Increasing the diameter of threaded portion |
| Answer» B. frequently manual locking and unlocking is necessary | |
| 55. |
Maximum gear ratio can be expected in case of |
| A. | Spur gears |
| B. | Worm and worm wheel |
| C. | Helical gears |
| D. | Straight bevel gears |
| E. | Double helical gears |
| Answer» B. Worm and worm wheel | |
| 56. |
The edges of boiler plates for fullering and caulking are bevelled at an angle of |
| A. | 60? |
| B. | 45? |
| C. | 70? |
| D. | 30? |
| E. | 80? |
| Answer» E. 80? | |
| 57. |
Spring index is |
| A. | Load carrying capacity of a spring |
| B. | The ratio of coil diameter to wire diameter |
| C. | The ratio of coil diameter to wire diameter |
| D. | An indication of the equality of springs |
| E. | The ratio of free length to that under design load |
| Answer» C. The ratio of coil diameter to wire diameter | |
| 58. |
Regenerative braking is used on |
| A. | Earth moving machines |
| B. | Heavy duty trucks |
| C. | Electric locomotives |
| D. | Diesel locomotives |
| E. | Steam locomotives |
| Answer» C. Electric locomotives | |
| 59. |
The plastic section modulus is |
| A. | the ratio of plastic moment capacity of a section to the yield moment |
| B. | Increasing the diameter of threaded portion |
| C. | the ratio of moment of inertia to radius of gyration |
| D. | the ratio of plastic moment capacity to the field stress |
| E. | area multiplied by the radius of gyration |
| Answer» A. the ratio of plastic moment capacity of a section to the yield moment | |
| 60. |
All of the following statements are false except |
| A. | The pitch of a sinle threaded screw is equal to the lead |
| B. | In a flange coupling, the bolts are subjected to compressive stress |
| C. | Oldham coupling is used for connecting piston rod of a steam engine to the cross head |
| D. | The resilience of a bolt may be increased by decreasing its shank diameter |
| E. | Increasing the diameter of threaded portion |
| Answer» A. The pitch of a sinle threaded screw is equal to the lead | |
| 61. |
Neglecting bending, for a parallel load on a fillet weld of equal legs the plane of maximum shear occurs at |
| A. | 45? |
| B. | 15? |
| C. | 60? |
| D. | 30? |
| E. | 22 |
| Answer» A. 45? | |
| 62. |
In watches and gramophones, which spring is most commonly used |
| A. | Flat spiral spring |
| B. | torsion helical spring |
| C. | conical helical spring |
| D. | none of the above |
| E. | Cast steel |
| Answer» A. Flat spiral spring | |
| 63. |
The edge of the plates for boilers and tanks are usually bevelled at an angle of 80? |
| A. | To reduce stress concentration |
| B. | For safety |
| C. | To facilitate joining |
| D. | For fullering and caulking |
| E. | None of the above |
| Answer» D. For fullering and caulking | |
| 64. |
The basic design stress adopted for the design of light gauge steel members is |
| A. | the stress at limit of proportionality |
| B. | the yield stress divided by 1.85 |
| C. | the yied stress |
| D. | the permissible stress |
| E. | Increasing the diameter of threaded portion |
| Answer» B. the yield stress divided by 1.85 | |
| 65. |
Lewis equation in ears is used to evaluate |
| A. | Tensile stress in bending |
| B. | Compressive stress in bending |
| C. | Creep stress |
| D. | Endurance limit |
| E. | Shear stress on flank |
| Answer» B. Compressive stress in bending | |
| 66. |
If a machine member is loaded in such a way that the three principal stresses at a point are 600 kg/cm2 tension, 800 kg/cm2 compression and zero. The maximum shear stress at the point will be |
| A. | 400 kg/cm2 |
| B. | 800 kg/cm2 |
| C. | 600 kg/cm2 |
| D. | 1000 kg/cm2 |
| E. | 200 kg/cm2 |
| Answer» A. 400 kg/cm2 | |
| 67. |
In V-belt drive the belt touches |
| A. | At bottom |
| B. | At sides only |
| C. | Both at bottom as well as sides |
| D. | Anywhere |
| E. | None of the above |
| Answer» E. None of the above | |
| 68. |
Ball bearing type screws |
| A. | Sliding friction is replaced by rolling friction |
| B. | There is a ball bearing provided on the screwed shafts |
| C. | Are self-locking |
| D. | Friction is more |
| E. | Have load bearing capacity for more than vee threads |
| Answer» A. Sliding friction is replaced by rolling friction | |
| 69. |
Stub teeth are provided on gears |
| A. | For high velocity ratios |
| B. | Low noise |
| C. | Large power transmission |
| D. | Improved capability to withstand shock and vibrations |
| E. | All of the above |
| Answer» D. Improved capability to withstand shock and vibrations | |
| 70. |
Which of the following is not the result of cold work? |
| A. | Increased tensile strength |
| B. | Increasing the diameter of threaded portion |
| C. | Reduced ductility |
| D. | Reduced shock resistance |
| E. | Reduced hardness |
| Answer» E. Reduced hardness | |
| 71. |
In a stone jaw crusher the main crank bearings are |
| A. | Taper roller bearings |
| B. | Roller bearings |
| C. | Ball bearings |
| D. | Double row ball bearings |
| E. | Self-aligning ball bearings |
| Answer» B. Roller bearings | |
| 72. |
The piston of a internal combustion engine is subjected to |
| A. | fully reversed stresses |
| B. | repeated stresses |
| C. | Increasing the diameter of threaded portion |
| D. | partly repeated stresses |
| E. | partly reversed stresses |
| Answer» E. partly reversed stresses | |
| 73. |
Spring stiffness is |
| A. | Load carrying capacity of spring |
| B. | Load per unit area of base |
| C. | Load/cross-sectional area of spring |
| D. | Load/unit deflection |
| E. | None of the above |
| Answer» D. Load/unit deflection | |
| 74. |
In a central heating system, the seamless copper tubing used has an inside diameter of 20 mm and a wall thickness of 0.6 mm. For a maximum pressure of 1750 Kpa, when allowable stress is 225 Mpa, the safety factor will be |
| A. | 7.7 |
| B. | 9.9 |
| C. | 3.3 |
| D. | 5.5 |
| E. | Increasing the diameter of threaded portion |
| Answer» A. 7.7 | |
| 75. |
While designing for screw threads care should be taken to provide adequate length of engagement for the screw and nut threads so as to prevent failure of threads in |
| A. | Tension |
| B. | Compression |
| C. | Torque |
| D. | Shear |
| E. | None of the above |
| Answer» D. Shear | |
| 76. |
In a bolt the plane of shear |
| A. | Should be across threaded portion of the shank |
| B. | Should never be acress threaded portion of the shank |
| C. | Should be parallel to the axis of bolt |
| D. | Should be normal so the threaded portion of the shank |
| E. | None of the above |
| Answer» B. Should never be acress threaded portion of the shank | |
| 77. |
In case of rivets, the countersunk heads are used to |
| A. | connect unequal sections |
| B. | Increasing the diameter of threaded portion |
| C. | provide a fluish surface |
| D. | connect structural members |
| E. | connect different materials |
| Answer» C. provide a fluish surface | |
| 78. |
Bolts in structures are often tightened |
| A. | upto 90% of yield point |
| B. | below yield point |
| C. | Increasing the diameter of threaded portion |
| D. | upto breaking point |
| E. | upto or beyond yield point |
| Answer» E. upto or beyond yield point | |
| 79. |
Which of the following key permits axial relative motion between the shaft and the hub? |
| A. | Wood ruff key |
| B. | Square key |
| C. | Increasing the diameter of threaded portion |
| D. | Gib headed key |
| E. | Feather key |
| Answer» E. Feather key | |
| 80. |
The moment-cuvature relation at a plastic hinge is |
| A. | is a constant curvature for all moments |
| B. | a constant moment for different curvatures |
| C. | Increasing the diameter of threaded portion |
| D. | always linear |
| E. | always linear |
| Answer» B. a constant moment for different curvatures | |
| 81. |
A simple supported steel beam when loaded with a force of 100 kg at A is found to deflect 10 mm at B. What force at B would cause a deflection of 2.5 mm at A |
| A. | 10 kg |
| B. | 50 kg |
| C. | 100 kg |
| D. | 400 kg |
| E. | 25 kg |
| Answer» E. 25 kg | |
| 82. |
Acoustical materials |
| A. | Create sound |
| B. | Create and reflect sound |
| C. | Absorb sound |
| D. | Reflect sound |
| E. | Absorb and reflect sound |
| Answer» C. Absorb sound | |
| 83. |
Fatigue strength of a surface may be increased by |
| A. | Applying concentrated hydrochloric acid on the surface |
| B. | Applying birine on the surface and then washing with cold water |
| C. | Making surface rough |
| D. | Filling the surface |
| E. | Polishing the surface |
| Answer» E. Polishing the surface | |
| 84. |
The function of gear box in an automobile is |
| A. | To provide variable speeds |
| B. | To reduce speed |
| C. | To increase speed |
| D. | To produce torque |
| E. | To increase efficiency |
| Answer» A. To provide variable speeds | |
| 85. |
A unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vartical bar 3 cm long and 6 cm2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be |
| A. | 1333 kg/cm2 |
| B. | 1000 kg/cm2 |
| C. | 667 kg/cm2 |
| D. | 1500 kg/cm2 |
| E. | 500 kg/cm2 |
| Answer» A. 1333 kg/cm2 | |
| 86. |
Which is the heaviest metal? |
| A. | Mild steel |
| B. | Lead |
| C. | Platinum |
| D. | Gold |
| E. | High speed steel |
| Answer» C. Platinum | |
| 87. |
Braking system used on aircraft is |
| A. | Pneumatic |
| B. | Regenerative |
| C. | Plugging |
| D. | Hydraulic |
| E. | Mechanical |
| Answer» D. Hydraulic | |
| 88. |
A fine series screws of major diameter 8 mm and pitch 1 mm is generally designated as |
| A. | M 8 x 1 |
| B. | 8 x M 1 |
| C. | 8 x 1 M |
| D. | 8 M |
| E. | 8 M 1 |
| Answer» A. M 8 x 1 | |
| 89. |
In order to avoid interference for 20 pressure and teeth, minimum number of teeth should be |
| A. | 8 |
| B. | More than 18 |
| C. | 12 |
| D. | More than 24 |
| E. | 16 |
| Answer» B. More than 18 | |
| 90. |
The bursting pressure of 12 mm ID, 14 mm OD seamless cartridge brass tubing having ultimate whear stress of 225 Mpa, will be nearly |
| A. | 40 Kpa |
| B. | Increasing the diameter of threaded portion |
| C. | 20 Kpa |
| D. | 10 Kpa |
| E. | 30 Kpa |
| Answer» A. 40 Kpa | |
| 91. |
Web crippling in beams generally occurs at points where |
| A. | concentrated load occurs |
| B. | deflection is maximum |
| C. | Increasing the diameter of threaded portion |
| D. | shear force is maximum |
| E. | bending moment is maximum |
| Answer» A. concentrated load occurs | |
| 92. |
Oldham's coupling is used to cannect two shafts which |
| A. | Are not in exact alignment |
| B. | Have two axes intersecting |
| C. | Have lateral misalignment |
| D. | Have lateral movement during power transmission |
| E. | Changes axes during power transmission |
| Answer» C. Have lateral misalignment | |
| 93. |
Smooth bearing surface is an essential pre-requisite in case of |
| A. | thin-film lubrication |
| B. | thick film lubrication |
| C. | both film (A) and (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. thick film lubrication | |
| 94. |
Machines screws are |
| A. | Generally provided with head longer than that of a normal screw |
| B. | Headless |
| C. | Provided with slotted head and used with a nut |
| D. | Screws with button-head |
| E. | Screws with rounded head |
| Answer» A. Generally provided with head longer than that of a normal screw | |
| 95. |
The wrist pin of diesel engine is always in |
| A. | Increasing the diameter of threaded portion |
| C. | a tresss free from shear |
| D. | single shear |
| E. | double shear |
| Answer» E. double shear | |
| 96. |
Which type of loading should be avoided |
| A. | Cleavage loading |
| B. | Shear loading |
| C. | Tensile loading |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» A. Cleavage loading | |
| 97. |
For traction applications, the type of motor best suited is |
| A. | Synchronous motor |
| B. | Induction motor |
| C. | DC series motor |
| D. | DC compound motor |
| E. | DC shunt motor |
| Answer» C. DC series motor | |
| 98. |
Splined shafts are commonly used in |
| A. | Machine tools |
| B. | Bicycles |
| C. | Aircraft |
| D. | Automobiles |
| E. | None of the above |
| Answer» D. Automobiles | |
| 99. |
The locomotive wheel tires are fitted as |
| A. | Wringing fit |
| B. | Loose fit |
| C. | Free fit |
| D. | Snug fit |
| E. | Shrink fit |
| Answer» E. Shrink fit | |
| 100. |
Lag bolts are generally used |
| A. | for fastening castings |
| B. | Increasing the diameter of threaded portion |
| C. | in wooden construction |
| D. | for tapping holes |
| E. | in electrical equipment |
| Answer» C. in wooden construction | |
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