McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 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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