MCQOPTIONS
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MCQOPTIONS
This section includes 152 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For the same co-efficient of friction between the road and the tier and assuming all the wheels at impending slip the stopping distance of vehicle from specified velocity on applying brakes |
| A. | increase with increase of the weight of vehicle |
| B. | decrease with increase of the weight of vehicle |
| C. | remains same irrespective of the weight of vehicle |
| D. | is unpredictable |
| Answer» D. is unpredictable | |
| 52. |
The stopping distance for a vehicle by applying brakes when all the four wheels are sliding as compared to when all the four wheels are at impending slide is______ |
| A. | more |
| B. | less |
| C. | same |
| D. | not predictable |
| Answer» B. less | |
| 53. |
For same μr and all wheels are impending slip, stopping distance for four wheel vehicle is _____ |
| A. | directly proportional to the velocity of vehicle |
| B. | directly proportional to square of the velocity of the vehicle |
| C. | directly proportional to weight of vehicle |
| D. | none of the above |
| Answer» C. directly proportional to weight of vehicle | |
| 54. |
Refer Fig. 5 Force downwards and direction counter clockwise________ |
| A. | system will work only if a is greater than b |
| B. | system will not work if a is less than b |
| C. | system will not work if a is equal to b |
| D. | all the above statements are correct |
| Answer» E. | |
| 55. |
Refer fig.4. It shows a band brake arrangements. The brake to work with force at A upwards and direction of drum clockwise____. |
| A. | a=b |
| B. | a>b |
| C. | a<b |
| D. | independent of ratio (a/b) |
| Answer» D. independent of ratio (a/b) | |
| 56. |
Refer fig.3, The best choice for this brake is to have pivot point at____. |
| A. | o1 |
| B. | o2 |
| C. | o3 |
| D. | anywhere between o3 and a. |
| Answer» C. o3 | |
| 57. |
Refer fig.3 Pivot point O3, force at A vertically up and if µ.d ≥ b then____. |
| A. | the brake is self-locking in clockwise direction |
| B. | the brake is self-locking in counter-clockwise direction |
| C. | the brake is self-locking in both the direction |
| D. | the brake is not self-locking in any direction |
| Answer» C. the brake is self-locking in both the direction | |
| 58. |
Refer fig.3 pivot point O1, force at B acting vertically up, then ____. |
| A. | brake is equally effective in both the directions |
| B. | brake is more effective in counter-clockwise directions |
| C. | brake is more effective in clockwise directions |
| D. | brake is not effective in any direction |
| Answer» D. brake is not effective in any direction | |
| 59. |
Refer fig.3 pivot point O2, force at A acting vertically up, then ____. |
| A. | brake is equally effective in both the directions |
| B. | brake is more effective in counter-clockwise directions |
| C. | brake is more effective in clockwise directions |
| D. | brake is not effective in any direction |
| Answer» B. brake is more effective in counter-clockwise directions | |
| 60. |
In a differential band brake, the effort required for clockwise rotation of drum compared to counterclockwise rotation is____. |
| A. | greater |
| B. | equal |
| C. | less |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 61. |
In a simple band brake, when direction of rotation of drum is changed from counter clockwise direction, the braking torque____. |
| A. | remains unchanged |
| B. | is increased |
| C. | is decreased |
| D. | is unpredictable |
| Answer» C. is decreased | |
| 62. |
In a block brake, when the fulcrum point is below the line of action of friction point, the ratio of effort required for clockwise and counter clockwise rotation is____. |
| A. | equal to 1 |
| B. | greater than 1 |
| C. | less than 1 |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 63. |
When moment due to friction force aids in applying the brake, it is called____. |
| A. | simple block brake |
| B. | pivoted block brake |
| C. | self-locking brake |
| D. | self-energized brake |
| Answer» E. | |
| 64. |
In block brake, the normal reaction and frictional force act at the mid-point of the block. This is true only if the angle of contact is ____ |
| A. | less than 45 degree |
| B. | less than 60 degree |
| C. | greater than 45 degree |
| D. | greater than 60 degree |
| Answer» B. less than 60 degree | |
| 65. |
A short shoe brake has angle of contact less than____degree. |
| A. | 60 |
| B. | 120 |
| C. | 45 |
| D. | 90 |
| Answer» D. 90 | |
| 66. |
Self-locking is not possible in the case of____. |
| A. | simple band brake |
| B. | differential band brake |
| C. | simple block brake |
| D. | internal expanding brake |
| Answer» B. differential band brake | |
| 67. |
The band brake in fig.2 will be self-energizing when____. |
| A. | drum rotates ccw and p acts upwards |
| B. | drum rotates ccw and p acts downwards |
| C. | drum rotates cw and p acts upwards |
| D. | drum rotates ccw and p acts downwards |
| Answer» E. | |
| 68. |
For ccw direction of drum rotation in fig.2 brake applied if ____. |
| A. | a>b and p acts downwards |
| B. | a<b and p acts downwards |
| C. | a=b and p acts downwards |
| D. | a>b and p acts upwards |
| Answer» B. a<b and p acts downwards | |
| 69. |
For a simple band brake to be effective____. |
| A. | tight side is connected to free end of lever and effort is applied at end so as to move this end away from drum |
| B. | same as (a) above but effort is so applied at end as to move this end towards the drum |
| C. | slack side is connected to the free end of the lever and the effort is applied at end so as to move it away from drum |
| D. | same as © but effort is applied at end so as to over this end towards the drum |
| Answer» E. | |
| 70. |
A motor car uses____. |
| A. | a band brake |
| B. | a band and block brake |
| C. | an external shoe brake |
| D. | an internally expanding shoe brake |
| Answer» E. | |
| 71. |
Tractive resistance during the propulsion of a wheeled vehicle depends on____. |
| A. | road resistance |
| B. | aerodynamic resistance b |
| C. | gradient resistance |
| D. | all of the above |
| Answer» E. | |
| 72. |
In an internal expanding shoe brake, more than 50% of the total braking torque is supplied by____. |
| A. | leading shoe |
| B. | trailing shoe |
| C. | any of the above |
| D. | none of these |
| Answer» B. trailing shoe | |
| 73. |
Brakes commonly used in trains are _____brakes. |
| A. | band |
| B. | shoe |
| C. | band and block |
| D. | internal expanding brake |
| Answer» C. band and block | |
| 74. |
In a self locking brake, the force required to apply the brake is_____. |
| A. | minimum |
| B. | zero |
| C. | maximum |
| D. | none of the above |
| Answer» C. maximum | |
| 75. |
Which of the following brakes is commonly used in two wheelers? |
| A. | disc brake |
| B. | band brake |
| C. | internal expanding shoe brake |
| D. | (a) and © |
| Answer» E. | |
| 76. |
When brakes are applied to all the four wheels of a moving car before it is brought to rest, will be____. |
| A. | maximum |
| B. | minimum |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 77. |
When the frictional force helps the applied force in applying the brake, the brake is____. |
| A. | self locking |
| B. | automatic |
| C. | self-energizing |
| D. | (a) and © |
| Answer» D. (a) and © | |
| 78. |
In a differential band brake, as shown in fig.1the length OA is greater than OB. In order to apply the brake, the force at C should____. |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of the above |
| Answer» D. none of the above | |
| 79. |
For the brake to be self locking, the force P at C as shown in fig.1 should____. |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of the above |
| Answer» B. act in upward direction | |
| 80. |
When will the distance travelled by 4-wheel be less after braking? |
| A. | applied to rear wheel |
| B. | when brakes applied to front wheel |
| C. | when brakes applied to all 4-wheels |
| D. | when brakes applied to rear wheel gradually |
| Answer» D. when brakes applied to rear wheel gradually | |
| 81. |
The brake commonly used in motor cars ____. |
| A. | shoe brake |
| B. | band brake |
| C. | band and block brake |
| D. | internal expanding brake |
| Answer» E. | |
| 82. |
Brakes are self energizing when____. |
| A. | frictional torque assists the applied torque |
| B. | frictional torque opposes the applied torque |
| C. | frictional torque vanishes |
| D. | none of the above |
| Answer» C. frictional torque vanishes | |
| 83. |
Brakes used in Railway engine are____. |
| A. | band brake |
| B. | internal expending brake |
| C. | shoe brake |
| D. | band and block brake |
| Answer» D. band and block brake | |
| 84. |
In a band brake 'a' is perpendicular distance between slack side and pivot point and 'b' is perpendicular distances between tight side and pivot point. If applied force is downwards then ___. |
| A. | a > b |
| B. | a = b |
| C. | a < b |
| D. | a = b2 |
| Answer» B. a = b | |
| 85. |
Which type of brakes are used in electric crane? |
| A. | internal expanding shoe brake |
| B. | differential band brake |
| C. | single block brake |
| D. | double bloke brake |
| Answer» E. | |
| 86. |
Material used for brake lining should not have ___. |
| A. | high heat dissipation capacity |
| B. | low heat resistance |
| C. | high strength |
| D. | high coefficient of friction |
| Answer» C. high strength | |
| 87. |
pivoted block brake is a kind of ____. |
| A. | single block brake |
| B. | shoe brake |
| C. | differential expanding band brake |
| D. | internal expanding shoe brake |
| Answer» C. differential expanding band brake | |
| 88. |
Can simple band brake be made of self-locking type? |
| A. | yes |
| B. | yes, but it will need many modifications |
| C. | yes, but with few limitations |
| D. | no |
| Answer» D. no | |
| 89. |
Determine the axial force required to engage a cone clutch transmitting 25 kW power at 750 rpm. Average friction diameter of the cone is 400 mm, semicone angle 60 degree and coefficient of friction 0.25. |
| A. | 325.30 nm and 1100.25 n |
| B. | 318.31 nm and 1105.47 n |
| C. | 320.25 nm and 1008.20 n |
| D. | 325.89 nm and 1120.30 n |
| Answer» C. 320.25 nm and 1008.20 n | |
| 90. |
A multiple clutch with 5 plate transmits torque of 400 N-m. If µ = 0.5 and inner radius = 10 cm and outer radius = 15 cm and four spring expert-axial and load per spring is ___. |
| A. | 200 n |
| B. | 300 n |
| C. | 400 n |
| D. | 1280 n |
| Answer» D. 1280 n | |
| 91. |
Torque transmitted by single plate clutch with axial spring load = 1 kN, and inner and outer radii of 10 cm and 15 cm and µ = 0.5 with assumption of uniform wear is ____. |
| A. | 250 n-m |
| B. | 125 n-m |
| C. | 62.5 n-m |
| D. | not possible to find with given data |
| Answer» D. not possible to find with given data | |
| 92. |
In multiple friction clutch, the number of active friction surfaces is ____. |
| A. | 2n |
| B. | n |
| C. | 2(n-1) |
| D. | n-1 |
| Answer» E. | |
| 93. |
A single plate clutch is transmitting power, the inner and other radii of the plate are 10 cm and 22.5 cm respectively. Using the radius uniform wear theory, the maximum pressure intensity occurs at a radius of ____. |
| A. | 10 cm |
| B. | 15 cm |
| C. | 16.25 cm |
| D. | 22.5 cm |
| Answer» B. 15 cm | |
| 94. |
The frictional torque transmitted by a cone clutch is same as that of ____. |
| A. | flat pivot bearing |
| B. | flat collar bearing |
| C. | conical pivot bearing |
| D. | trapezoidal pivot bearing |
| Answer» E. | |
| 95. |
Which of the following is an example of friction clutch? |
| A. | disc clutch |
| B. | cone clutch |
| C. | centrifugal clutch |
| D. | all of the above |
| Answer» E. | |
| 96. |
Single plate clutch is a kind of _________. |
| A. | positive clutch |
| B. | cone clutch |
| C. | centrifugal clutch |
| D. | disc clutch |
| Answer» E. | |
| 97. |
In case of multiplate clutch, power transmission is same as that of ______. |
| A. | flat pivot bearing |
| B. | flat pivot bearing |
| C. | trapezoidal pivot bearing |
| D. | conical pivot bearing |
| Answer» C. trapezoidal pivot bearing | |
| 98. |
Considering the safe design, the friction clutch should be designed _______ |
| A. | assuming uniform pressure |
| B. | assuming uniform wear |
| C. | assuming any criteria, either uniform pressure or uniform wear |
| D. | assuming uniform pressure for high torque and uniform wear for low torque |
| Answer» C. assuming any criteria, either uniform pressure or uniform wear | |
| 99. |
Centrifugal clutch are used in _____ |
| A. | truck |
| B. | racing car |
| C. | hack saw |
| D. | mopeds |
| Answer» E. | |
| 100. |
Multiple clutch is kind of_________ |
| A. | positive clutch |
| B. | cone clutch |
| C. | centrifugal clutch |
| D. | disc clutch |
| Answer» E. | |