McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
In order to balance the reciprocating masses, the conditions to be satisfied are |
| A. | Primary forces must balance |
| B. | All above conditions must be satisfied |
| C. | Secondary couples must balance |
| D. | Primary couples must balance |
| E. | Secondary forces must balance |
| Answer» B. All above conditions must be satisfied | |
| 52. |
A cam profile is the |
| A. | Actual working contour of the cam |
| B. | Profile of path traced by a cam follower |
| C. | Total surface area of the cam |
| D. | Path which the cam follower traces |
| E. | The profile of the path to be traced by the mechanism driven by follower |
| Answer» A. Actual working contour of the cam | |
| 53. |
The number of instantaneous centres for a four bar chain mechanism would be |
| A. | 4 |
| B. | 6 |
| C. | 5 |
| D. | 3 |
| E. | 2 |
| Answer» B. 6 | |
| 54. |
Which dynamometer will be most suitable for measuring the BHP of an automobile engine? |
| A. | Electrical generator type |
| B. | Rope brake type |
| C. | Prony brake |
| D. | Electrical resistance type |
| E. | Hydraulic |
| Answer» E. Hydraulic | |
| 55. |
In case of locomotives, the effect of hammer blow is counteracted by |
| A. | Flanges of the tyres of the wheels |
| B. | Balancing weights |
| C. | Inside section of the rails |
| D. | Dead weight of the engine |
| E. | All of the above |
| Answer» D. Dead weight of the engine | |
| 56. |
A 0.5 kg weight attached to a light spring elogates it 7.87 mm. The natural frequency of the system would be in the range |
| A. | 100-175 cpm |
| B. | 300-350 cpm |
| C. | 175-290 cpm |
| D. | 25-50 cpm |
| E. | 50-100 cpm |
| Answer» B. 300-350 cpm | |
| 57. |
The secondary critical speed of a shaft occurs at |
| A. | Twice the primary critical speed |
| B. | Occurs only when there are more than 2 rotors on a shaft |
| C. | Four times the primary critical speed |
| D. | If the externam exciting system has a frequency other than the primary critical speed |
| E. | Half the primary critical speed |
| Answer» A. Twice the primary critical speed | |
| 58. |
Which of the following instruments may be used in vibration measurements? |
| A. | Photometer |
| B. | Accelerometer |
| C. | Dynamometer |
| D. | Balometer |
| E. | None of the above |
| Answer» B. Accelerometer | |
| 59. |
In locomotives the unbalanced part of the primary disturbing force due to reciprocating masses, cause |
| A. | Variation of tractive effect |
| B. | Periodical vibrations |
| C. | Lifting of locomotive |
| D. | Oscillation in vertical planes |
| E. | Hammer blow |
| Answer» A. Variation of tractive effect | |
| 60. |
The 'crowning' of flat pulleys is generally done pulley |
| A. | To reduce belt friction |
| B. | To prevent belt joining from damaging the belt surface |
| C. | To prevent the belt from running off the pulley |
| D. | In case of cross belt drives only |
| E. | None of the above |
| Answer» C. To prevent the belt from running off the pulley | |
| 61. |
V belt having cross-section A is suitable for usual load of 5 HP. If 15 HP load is to be transmitted |
| A. | Toothed belts may be used |
| B. | 3 Vee belts using 3 groove pulley may be used |
| C. | Machine arrangement may be modified |
| D. | Drive system may be changed |
| E. | Gear system may be adopted |
| Answer» B. 3 Vee belts using 3 groove pulley may be used | |
| 62. |
The efficiency in case of worm gear drives is generally in the range |
| A. | 70-85 percent |
| B. | 50-70 percent |
| C. | 10-25 percent |
| D. | 25-40 percent |
| E. | 40 - 60 percent |
| Answer» A. 70-85 percent | |
| 63. |
Two shafts have their axes not in the same straight line. Also their axes are not parallel but intersecting. Which of the following coupling can be used for these shafts? |
| A. | Flexible coupling |
| B. | Universal coupling |
| C. | Oldham's coupling |
| D. | Rigid coupling |
| E. | Any of the above |
| Answer» B. Universal coupling | |
| 64. |
Coriolis component is not involved in |
| A. | Andreau variable stroke engine mechanism |
| B. | Slider crank mechanism |
| C. | Line sliding in a swivelling pin |
| D. | Quick return mechanism |
| E. | Tangent cam acceleration |
| Answer» B. Slider crank mechanism | |
| 65. |
Idler pulley is used for |
| A. | Maintaining belt tension |
| B. | Changing direction of rotation |
| C. | For stopping motion frequently |
| D. | For running during idling periods only |
| E. | None of the above |
| Answer» A. Maintaining belt tension | |
| 66. |
Contact ratio of gear should be |
| A. | One |
| B. | More than one |
| C. | Less than one |
| D. | Not defined |
| E. | None of the above |
| Answer» D. Not defined | |
| 67. |
The number of nodes in a shaft carrying three rotors will be |
| A. | Three |
| B. | Zero |
| C. | Four |
| D. | Two |
| E. | One |
| Answer» D. Two | |
| 68. |
By using large thread angles in a lifting machine |
| A. | The mechanical advantage will be low |
| B. | The mechanical advantage will be high |
| C. | The load will be sustained in absence of effort |
| D. | The load will be easily lifted |
| E. | While unloading, little effort will be required |
| Answer» A. The mechanical advantage will be low | |
| 69. |
The throw of a cam is the maximum distance of the follower from |
| A. | Starting to finish |
| B. | Inner most circle |
| C. | Root circle |
| D. | Pitch circle |
| E. | Base circle |
| Answer» E. Base circle | |
| 70. |
The number of degrees of feeedom for a vibrating beam will be |
| A. | Nil |
| B. | Four |
| C. | Two |
| D. | Five |
| E. | One |
| Answer» C. Two | |
| 71. |
Which of the following is a lower pair? |
| A. | Piston and cylinder |
| B. | Cam and follower |
| C. | Belt drive |
| D. | Gear |
| E. | None of the above |
| Answer» A. Piston and cylinder | |
| 72. |
Which of the following is a dead weight governor? |
| A. | Porter governer |
| B. | Hartness governer |
| C. | Watt governor |
| D. | None of the above |
| E. | None of the above |
| Answer» A. Porter governer | |
| 73. |
The mechanism used in a petrol engine is |
| A. | Crank mechanism |
| B. | Slider mechanism |
| C. | Slider crank mechanism |
| D. | Natural line and circular mechanism |
| E. | None of the above |
| Answer» C. Slider crank mechanism | |
| 74. |
In the Crossby engine indicator which one of the following mechanism is used? |
| A. | Slider-crank mechanism |
| B. | Scotch yoke mechanism |
| C. | Scotch yoke mechanism |
| D. | Modified pantograph mechanism |
| E. | None of the above |
| Answer» C. Scotch yoke mechanism | |
| 75. |
Timing belt |
| A. | Have no slip |
| B. | Have maximum slip during starting |
| C. | Slip in proportion to the time of operation |
| D. | Are used to determine the life time of a belt |
| E. | None of the above |
| Answer» A. Have no slip | |
| 76. |
The speed ratio in case of micro gears is |
| A. | Between 1.1 and 5 |
| B. | More than 10 |
| C. | Less than 1 |
| D. | Between 5 and 10 |
| E. | 1 |
| Answer» E. 1 | |
| 77. |
For a rational number for the pitch circle diameter and a rational number of teeth on the wheel, the circular pitch will work out to |
| A. | An odd number |
| B. | An even number |
| C. | A rational number |
| D. | An irrational number |
| E. | None of the above |
| Answer» D. An irrational number | |
| 78. |
A swinging field type dynamometer is |
| A. | Torsion dynamometer |
| B. | Vortex type dynamometer |
| C. | Friction dynamometer |
| D. | Electrical dynamometer |
| E. | Transmission type of dynamometer |
| Answer» D. Electrical dynamometer | |
| 79. |
Forced vibrations |
| A. | Are followed by free vibrations |
| B. | Are preceded by free vibrations |
| C. | Take place at a frequency more than natural frequency |
| D. | Are independent of natural frequency |
| E. | None of the above |
| Answer» D. Are independent of natural frequency | |
| 80. |
A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is inelastic the velocity of of two masses after impact will be |
| A. | 8.33 m/s |
| B. | 4.17 m/s |
| C. | Zero |
| D. | 13.3 m/s |
| E. | 6.67 m/s |
| Answer» A. 8.33 m/s | |
| 81. |
The critical speed of a shaft is affected by |
| A. | Diameter of the disc |
| B. | Eccentricity |
| C. | Span of shaft |
| D. | (A) and (B) above |
| E. | (A), (B) and (C) above |
| Answer» E. (A), (B) and (C) above | |
| 82. |
A standard gear cutter No. 3 is marked to cut 35-54 teeth. It implies that |
| A. | The cutter is to be replaced after cutting 54 teeth |
| B. | The cutter will be suitable for gears having 35 to 54 teeth |
| C. | The cutter will be suitable for spur gear teeth cutting only |
| D. | The cutter will provide correct profile for any gear having number of teeth in the range 35 to 54 |
| E. | None of the above |
| Answer» B. The cutter will be suitable for gears having 35 to 54 teeth | |
| 83. |
A kinematic chain requires minimum of |
| A. | 3 links and 3 turning pairs |
| B. | 4 links and 4 turning pairs |
| C. | 3 links and 4 turning pairs |
| D. | 2 links and 3 turning pairs |
| E. | 4 links and 5 turning pairs |
| Answer» B. 4 links and 4 turning pairs | |
| 84. |
Which type of governor is preferred for gramophones? |
| A. | Harting |
| B. | Porter |
| C. | Hartnell |
| D. | Pickering |
| E. | Watt |
| Answer» D. Pickering | |
| 85. |
An axial flow fan balanced at one speed often exhibits substantial vibrational effects when operated at other speeds, mainly due to |
| A. | Unbalanced parts of fan |
| B. | Aerodynamic unbalance |
| C. | Primary critical speed effect |
| D. | Secondary critical speed effect |
| E. | Vibration in air |
| Answer» B. Aerodynamic unbalance | |
| 86. |
In a kinematic chain the minimum number of kinematic pairs required is |
| A. | Five |
| B. | Three |
| C. | Four |
| D. | Two |
| E. | One |
| Answer» C. Four | |
| 87. |
Which of the following is a spring controlled governor? |
| A. | Harting governor |
| B. | Pickering governor |
| C. | Hartnell governor |
| D. | Wilson hartnell governor |
| E. | All of the above |
| Answer» E. All of the above | |
| 88. |
The sum of the tensions when the belt is running on the pulley is |
| A. | Less than the initial tension |
| B. | More than the initial tension |
| C. | More than twise the initial tension |
| D. | Half the initial tension |
| E. | None of the above |
| Answer» C. More than twise the initial tension | |
| 89. |
Klien's construction gives a graphical construction for |
| A. | Velocity polygon |
| B. | Slider crank mechanism |
| C. | Angular accelerations |
| D. | Acceleration polygon |
| E. | Four bar chain mechanism |
| Answer» D. Acceleration polygon | |
| 90. |
In order that a belt may not run off the pulley |
| A. | It should be properly tightened |
| B. | The centre line of the belt as it approaches the pulley must lie in a plane perpendicular to the axis of that pulley |
| C. | The belt should be provided with frictional material |
| D. | The belt should be provided with a guide |
| E. | None of the above |
| Answer» B. The centre line of the belt as it approaches the pulley must lie in a plane perpendicular to the axis of that pulley | |
| 91. |
The gears are considered to be operating in medium velocity range if their peripheral velocity lies in the range |
| A. | 25-50 m/sec |
| B. | 3-15 m/sec |
| C. | 15-25 m/sec |
| D. | 1-3 m/sec |
| E. | 50-75 m/sec |
| Answer» B. 3-15 m/sec | |
| 92. |
Motor cycle shock sbsorbers are generally designed for |
| A. | Resonant damping |
| B. | Light damping |
| C. | Large damping |
| D. | Critical damping |
| E. | Partial damping |
| Answer» D. Critical damping | |
| 93. |
A point on a link connecting double slider crank chain, traces a |
| A. | Circular path |
| B. | Hoperbolic path |
| C. | Straight line path |
| D. | Parabolic path |
| E. | Elliptical path |
| Answer» E. Elliptical path | |
| 94. |
Velocity of sliding between two mating gear surfaces can be defined as |
| A. | Sum of their angular velocities x distance between pitch point and point of contact. |
| B. | Sum of their angular velocities x distance between their centres of rotation. |
| C. | Sum of their angular velocities x difference between their pitch circle diameters |
| D. | None of these |
| E. | None of the above |
| Answer» A. Sum of their angular velocities x distance between pitch point and point of contact. | |
| 95. |
Identify incorrect statement regarding the flywheel, if any |
| A. | It is provided to minimise vibration of engine |
| B. | It takes care of output fluctuations and controls input accordingly |
| C. | It is provided to control engine speed |
| D. | All above |
| E. | In help in starting engine |
| Answer» D. All above | |
| 96. |
The number of natural frequencies for three rotor system will be |
| A. | Six |
| B. | Three |
| C. | One |
| D. | Four |
| E. | Two |
| Answer» E. Two | |
| 97. |
In case of gears, the interference takes place |
| A. | Whenever the forms of the mating teeth are such that contact between them can occur at some place other than along the correct path of contact |
| B. | When gears do not move smoothly in absence of lubrication |
| C. | When the pitch of the gears is not same |
| D. | When the gear teeth are under cut |
| E. | None of the above |
| Answer» A. Whenever the forms of the mating teeth are such that contact between them can occur at some place other than along the correct path of contact | |
| 98. |
In case of solid friction, when tan ? = |
| A. | The body A will move over the surface B irrespective of the magnitude of the force F applied on the body |
| B. | tan ? can be equal to |
| C. | tan ? can never be equal to |
| D. | No motion of body A on surface B is possible, irrespective of how large the magnitude of force F applied on the body may be |
| E. | tan ? can be equal to |
| Answer» A. The body A will move over the surface B irrespective of the magnitude of the force F applied on the body | |
| 99. |
Which of the following is a dead weight type governor? |
| A. | Porter governor |
| B. | Hartnell governor |
| C. | Watt governor |
| D. | All of the above |
| E. | None of the above |
| Answer» A. Porter governor | |
| 100. |
Which of the following is not a positive drive? |
| A. | Rope drive |
| B. | Flat belt drive |
| C. | V-belt drive |
| D. | All of the above |
| E. | None of the above |
| Answer» E. None of the above | |
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