MCQOPTIONS
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MCQOPTIONS
This section includes 509 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Snap head rivets are used in |
| A. | Structural work |
| B. | Ship building |
| C. | Aircraft body |
| D. | Any of the above |
| E. | None of the above |
| Answer» B. Ship building | |
| 52. |
The minimum thickness of steel members exposed to weather and accessible for paintng is |
| A. | 8 mm |
| B. | 10 mm |
| C. | Increasing the diameter of threaded portion |
| D. | 6 mm |
| E. | 4 mm |
| Answer» C. Increasing the diameter of threaded portion | |
| 53. |
Shear strain energy theory of the failure of a material at elastic limit is due to |
| A. | Rankine |
| B. | Increasing the diameter of threaded portion |
| C. | Haig |
| D. | St. Venant |
| E. | Von Mises |
| Answer» F. | |
| 54. |
In oilless bearings |
| A. | There is no external supply of lubricant |
| B. | The lubrication is achieved by adding sulid lubricants |
| C. | Grease is used for lubrication |
| D. | Graphite is used for lubrication |
| E. | None of the above |
| Answer» B. The lubrication is achieved by adding sulid lubricants | |
| 55. |
The purpose of providing multiple collars on a flat collar pivot bearing is to |
| A. | Increase frictional resistance |
| B. | Establish self-substaining bearing condition |
| C. | Distribute the frictional load because of limiting frictional resistance |
| D. | Distribute the axial load becase of limiting bearing pressure on a collar |
| E. | None of the above |
| Answer» E. None of the above | |
| 56. |
For steel ultimate strength in tension compared to that in shear is |
| A. | 1?2 |
| B. | 3?2 |
| C. | Same |
| D. | 2?3 |
| E. | 2?1 |
| Answer» C. Same | |
| 57. |
In a ball bearing a sleeve is fixed to |
| A. | To protect bearing against dust etc. |
| B. | Reduce friction |
| C. | Prevent relative axial movement between the shaft and bearing |
| D. | Carry more load |
| E. | Reduce wear |
| Answer» D. Carry more load | |
| 58. |
Beams composed of more than one material, regidly connected so as to behave as one piece are known as |
| A. | determinate beams |
| B. | inditerminate beams |
| C. | Increasing the diameter of threaded portion |
| D. | composite beams |
| E. | compound beams |
| Answer» E. compound beams | |
| 59. |
The Euler's formula for columns is valid for |
| A. | Increasing the diameter of threaded portion |
| B. | large slenderness ratio |
| C. | all slenderness ratios |
| D. | zero slendemess ratio |
| E. | small slenderness ratio |
| Answer» C. all slenderness ratios | |
| 60. |
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw is called |
| A. | castle nut |
| B. | jam nut |
| C. | sawn nut |
| D. | ring nut |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 61. |
The trunions of a mixing machine have an effective length of 30 cm and the weight coming on each trunion is 1250 kg. If the fibre stress is not to exceed 350 kg/sq-cm the diameter of the trunions should be |
| A. | 6 cm |
| B. | 8 cm |
| C. | 12 cm |
| D. | 4 cm |
| E. | 10 cm |
| Answer» C. 12 cm | |
| 62. |
Bolted joints often fail in |
| A. | tension only |
| B. | compresson only |
| C. | torsion only |
| D. | Increasing the diameter of threaded portion |
| E. | shear only |
| Answer» B. compresson only | |
| 63. |
The value of load factor which accounts for margin of safety in plastic design for gravity loads is about |
| A. | 1.85 |
| B. | 2.15 |
| C. | Increasing the diameter of threaded portion |
| D. | 1.25 |
| E. | 1.55 |
| Answer» B. 2.15 | |
| 64. |
Which of the following bearing will have least coefficient of friction? |
| A. | Cylindrical foller bearing |
| B. | Tapered bearing |
| C. | Single ball bearing |
| D. | Thrust ball bearing |
| E. | Self-aligning bearing |
| Answer» C. Single ball bearing | |
| 65. |
A key seldom fails in |
| A. | Increasing the diameter of threaded portion |
| B. | tearing |
| C. | shearing |
| D. | crushing |
| Answer» C. shearing | |
| 66. |
The holding power of a saddle key is due to |
| A. | Torsion |
| B. | Shear force |
| C. | Compressive force |
| D. | Friction force |
| E. | Tensile force |
| Answer» E. Tensile force | |
| 67. |
The most common material for the balls and races of ball bearings is |
| A. | High carbon steel |
| B. | High speed steel |
| C. | high chromium steel |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 68. |
The surface endurance limit of gear material is dependent on its |
| A. | Toughness |
| B. | Surface hardness |
| C. | Surface lubrication |
| D. | Elastic strength |
| E. | Coefficient of friction |
| Answer» C. Surface lubrication | |
| 69. |
The most common material used for rivets is |
| A. | cast iron |
| B. | malleable cast iron |
| C. | mild steel |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 70. |
Low pressure angle on gears is likely to result in |
| A. | Weaker teeth |
| B. | Abrasion |
| C. | Wear |
| D. | Pitting |
| E. | Stronger teeth |
| Answer» B. Abrasion | |
| 71. |
A series of continuous spot welds |
| A. | dot matrix |
| B. | Increasing the diameter of threaded portion |
| C. | stitch weld |
| D. | butt weld |
| E. | seam weld |
| Answer» F. | |
| 72. |
In the Laminated springs, the flat plates of different lengths are provided for |
| A. | Reducing deflection |
| B. | Appearance |
| C. | Economy |
| D. | Equal distribution of stress |
| E. | Reducing bulk |
| Answer» E. Reducing bulk | |
| 73. |
In case of springs in order to achieve greater load carrying capacity when the outer diameter is limited |
| A. | Square section is used |
| B. | Elliptical section is used |
| C. | Rectangular section is used |
| D. | Concentric springs are used |
| E. | None of the above |
| Answer» E. None of the above | |
| 74. |
Yield point in static loading as compared to that in fatigue loading is |
| A. | Depends on composition of material |
| B. | Same |
| C. | Lower |
| D. | Higher |
| E. | Depends on loading rate |
| Answer» E. Depends on loading rate | |
| 75. |
Slenderness ratio of the lacing bar for compression member should not exceed |
| A. | 125 |
| B. | Increasing the diameter of threaded portion |
| C. | 100 |
| D. | 175 |
| E. | 145 |
| Answer» F. | |
| 76. |
A key that transmits power through frictional resistance only is |
| A. | Saddle key |
| B. | Wood ruff key |
| C. | Square key |
| D. | All of the above |
| E. | None of the above |
| Answer» B. Wood ruff key | |
| 77. |
A suspended body is to be struck heavily without producing any reaction at the support. It should be hit at |
| A. | Centre of spin |
| B. | Centre of gravity |
| C. | Metacentre |
| D. | Centroid |
| E. | Centre of percussion |
| Answer» F. | |
| 78. |
The angle through which a gear turns from the beginning of contact of a pair of teeth until the contact reaches the pitch point, is known as |
| A. | Angle of approach |
| B. | Angle of action |
| C. | Angle of contact |
| D. | Pressure angle |
| E. | Approach angle |
| Answer» B. Angle of action | |
| 79. |
A coupling used to connect two perfectly aligned shafts is |
| A. | bush pin coupling |
| B. | Oldham coupling |
| C. | rigid tlange coupling |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 80. |
Two springs having stiffness are in series. The equivalent stiffness would be |
| A. | K |
| B. | K/4 |
| C. | 4 K |
| D. | 2 K |
| E. | K/2 |
| Answer» F. | |
| 81. |
Iniversal coupling is |
| A. | Used for collinear shafts |
| B. | Rigid coupling |
| C. | Type of flange coupling |
| D. | Used for non-collinear shafts |
| E. | None of the above |
| Answer» E. None of the above | |
| 82. |
The number of possible independency mechanisms, n is determined from the following relationship |
| A. | n = 2 N - r |
| B. | n = 2 N + r |
| C. | Increasing the diameter of threaded portion |
| D. | n = N + r |
| E. | n = N - r |
| Answer» F. | |
| 83. |
Ball bearing type screws are generally used |
| A. | In bench vices |
| B. | In screw jacks |
| C. | In earthmoving machinery |
| D. | Steering mechanisms |
| E. | None of the above |
| Answer» E. None of the above | |
| 84. |
For water tight joints such as in boiler the rivets are driven |
| A. | Increasing the diameter of threaded portion |
| B. | either in hot or cold condition |
| C. | in cold condition only |
| D. | in hot condition only |
| Answer» F. | |
| 85. |
A circulating water pump of a condenser is of the centrifugal type and directly connected to a three phase induction motor running at 900 rpm. The pump delivers 30,000 litres per minute against the dynamic head of 10 m. The horse power of the motor required to drive the pump would be |
| A. | 40-50 HP |
| B. | 50-60 HP |
| C. | 60-70 HP |
| D. | 30-40 HP |
| E. | 20-30 HP |
| Answer» D. 30-40 HP | |
| 86. |
Addendum is |
| A. | The depth of a gear tooth |
| B. | Half the depth of a gear tooth |
| C. | Depth of tooth space below the pitch circle |
| D. | Height by which tooth projects beyond the pitch circle |
| E. | None of the above |
| Answer» E. None of the above | |
| 87. |
When power is to be transmitted by two pulleys of different materials, then design will be based on pulley |
| A. | Having smaller diameter |
| B. | Having larger diameter |
| C. | Having ( |
| D. | Having ( |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 88. |
The maximum size of the fillet weld that can be made in single pass is |
| A. | 12 mm |
| B. | 3 mm |
| C. | Increasing the diameter of threaded portion |
| D. | 8 mm |
| E. | 6 mm |
| Answer» E. 6 mm | |
| 89. |
Commonly adopted material for rivets in |
| A. | Mild steel |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Malleable iron |
| E. | None of the above |
| Answer» B. Cast iron | |
| 90. |
In case of ductile materials the theory of elastic failure generally applied is |
| A. | Maximum shear stress theory |
| B. | Maximum principal stress theory |
| C. | Distortion energy theory |
| D. | Maximum strain theory |
| E. | Maximum total strain energy theory |
| Answer» B. Maximum principal stress theory | |
| 91. |
The number of plastic hinges necessary to convert a framed structure into a mechanism is (r is degree of redundancy of the structure) |
| A. | r - 1 |
| B. | r + 1 |
| C. | 2r + 1 |
| D. | 2r - 1 |
| E. | Increasing the diameter of threaded portion |
| Answer» C. 2r + 1 | |
| 92. |
If the Brinell hardness number of a sample of steel is 200, the ultimate tensile strength will be approximately |
| A. | Cannot be determined |
| B. | 70 kgf/mm2 |
| C. | 200 kgf/mm2 |
| D. | 100 kgf/mm2 |
| E. | Silver |
| Answer» C. 200 kgf/mm2 | |
| 93. |
Stretching on a belt can be controlled by |
| A. | decreasing belt length |
| B. | decreasing stress in the belt |
| C. | decreasing belt velocity |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. decreasing belt velocity | |
| 94. |
For butt welding of two plates, each of which is 300 cm thick, the best process would be |
| A. | Submerged are welding |
| B. | MIG welding |
| C. | TIG welding |
| D. | Gas welding |
| E. | Electro slag welding |
| Answer» F. | |
| 95. |
Full stress reversal normally does not occur in bolted connections due to |
| A. | surface hardness |
| B. | ridges and valleys in the form of threads |
| C. | varying cross-section |
| D. | Increasing the diameter of threaded portion |
| E. | pre-loading during tightening |
| Answer» F. | |
| 96. |
Which of the following key is used for light work? |
| A. | Round key |
| B. | Increasing the diameter of threaded portion |
| C. | Tangent key |
| D. | Sunk key |
| E. | Saddle key |
| Answer» F. | |
| 97. |
Which process will improve the fatigue life of a part? |
| A. | Electrocoating |
| B. | Chemical coating |
| C. | Shot peening |
| D. | Polishing |
| E. | Electroplating |
| Answer» D. Polishing | |
| 98. |
Washer are generally specified by |
| A. | Thickness |
| B. | Outer diameter |
| C. | Central hole diameter |
| D. | Mean diameter |
| E. | (A) and (C) above |
| Answer» D. Mean diameter | |
| 99. |
In case of automobile body work the type of welding generally used is |
| A. | Arc welding |
| B. | Submerged are welding |
| C. | Spot welding |
| D. | Gas welding |
| E. | Seam welding |
| Answer» D. Gas welding | |
| 100. |
The frictional horse power loss in a bearing having 25 mm diameter subjected to a load of 200 kg rotating at 600 rpm will be of the order of |
| A. | 2HP |
| B. | 0.05 HP |
| C. | 1 HP |
| D. | 0.5 HP |
| E. | 10 HP |
| Answer» C. 1 HP | |