McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
Frictional torque transmission through plate clutch is equivalent to____ |
| A. | conical pivot bearing |
| B. | flat pivot bearing |
| C. | trapezoidal pivot bearing |
| D. | flat roller bearing |
| Answer» D. flat roller bearing | |
| 52. |
In case of cone clutch, power transmission is same as that of________ |
| A. | flat pivot bearing |
| B. | flat collar bearing |
| C. | trapezoidal pivot bearing |
| D. | conical pivot bearing |
| Answer» C. trapezoidal pivot bearing | |
| 53. |
Multiple clutch is kind of_________ |
| A. | positive clutch |
| B. | cone clutch |
| C. | centrifugal clutch |
| D. | disc clutch |
| Answer» D. disc clutch | |
| 54. |
Among which clutch heat dissipation is a serious problem? |
| A. | multiple clutch |
| B. | positive clutch |
| C. | cone clutch |
| D. | centrifugal clutch |
| Answer» A. multiple clutch | |
| 55. |
In case of clutch , uniform pressure theory is applicable for |
| A. | old clutch |
| B. | new clutch |
| C. | rusted clutch |
| D. | clutch made of hard material |
| Answer» B. new clutch | |
| 56. |
Centrifugal clutch are used in _____ |
| A. | truck |
| B. | racing car |
| C. | hack saw |
| D. | mopeds |
| Answer» D. mopeds | |
| 57. |
A friction clutch should be designed on the assumption of |
| A. | uniform wear |
| B. | uniform pressure |
| C. | constant friction |
| D. | any one |
| Answer» A. uniform wear | |
| 58. |
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» B. assuming uniform wear | |
| 59. |
The equivalent coefficient of friction for a cone clutch is ____. |
| A. | µ sinα |
| B. | µ tanα |
| C. | µ/sinα |
| D. | µ/tanα |
| Answer» C. µ/sinα | |
| 60. |
Frictional torque transmission through multi plate clutch is equivalent to____. |
| A. | conical pivot bearing |
| B. | flat pivot bearing |
| C. | trapezoidal pivot bearing |
| D. | flat roller bearing |
| Answer» D. flat roller bearing | |
| 61. |
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» B. flat pivot bearing | |
| 62. |
Single plate clutch is a kind of _________. |
| A. | positive clutch |
| B. | cone clutch |
| C. | centrifugal clutch |
| D. | disc clutch |
| Answer» D. disc clutch | |
| 63. |
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» D. all of the above | |
| 64. |
The frictional torque transmitted by a disc clutch is same as that of _____. |
| A. | flat pivot bearing |
| B. | flat collar bearing |
| C. | conical pivot bearing |
| D. | trapezoidal pivot bearing |
| Answer» B. flat collar bearing | |
| 65. |
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» D. trapezoidal pivot bearing | |
| 66. |
For safe design, a frictional clutch is designed assuming ____. |
| A. | uniform pressure theory |
| B. | uniform wear theory |
| C. | any one of the two |
| D. | none of the above |
| Answer» B. uniform wear theory | |
| 67. |
In multiple friction clutch, the number of active friction surfaces is ____. |
| A. | 2n |
| B. | n |
| C. | 2(n-1) |
| D. | n-1 |
| Answer» D. n-1 | |
| 68. |
Friction torque transmitted by a disc or plat clutch is same as that of ____. |
| A. | flat pivot bearing |
| B. | flat collar bearing |
| C. | conical pivot bearing |
| D. | truncated conical pivot bearing |
| Answer» B. flat collar bearing | |
| 69. |
For multiple plate friction clutch with n plates, the number of active surfaces n |
| A. | n |
| B. | n+1 |
| C. | n-1 |
| D. | n/2 |
| Answer» A. n | |
| 70. |
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» A. 10 cm | |
| 71. |
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» C. 62.5 n-m | |
| 72. |
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» C. 400 n | |
| 73. |
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 10 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» B. 318.31 nm and 1105.47 n | |
| 74. |
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» B. 318.31 nm and 1105.47 n | |
| 75. |
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» C. yes, but with few limitations | |
| 76. |
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» B. low heat resistance | |
| 77. |
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» B. shoe brake | |
| 78. |
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» D. double bloke brake | |
| 79. |
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» A. a > b | |
| 80. |
Brakes used in Railway engine are____. |
| A. | band brake |
| B. | internal expending brake |
| C. | shoe brake |
| D. | band and block brake |
| Answer» C. shoe brake | |
| 81. |
The brake commonly used in motor cars ____. |
| A. | shoe brake |
| B. | band brake |
| C. | band and block brake |
| D. | internal expanding brake |
| Answer» D. internal expanding brake | |
| 82. |
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» C. when brakes applied to all 4-wheels | |
| 83. |
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» B. frictional torque opposes the applied torque | |
| 84. |
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» C. act in downward direction | |
| 85. |
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» A. be zero | |
| 86. |
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» B. minimum | |
| 87. |
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» D. (a) and © | |
| 88. |
Brakes commonly used in trains are _____brakes. |
| A. | band |
| B. | shoe |
| C. | band and block |
| D. | internal expanding brake |
| Answer» B. shoe | |
| 89. |
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» B. zero | |
| 90. |
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» C. self-energizing | |
| 91. |
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» A. leading shoe | |
| 92. |
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» D. all of the above | |
| 93. |
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» D. an internally expanding shoe brake | |
| 94. |
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» D. same as © but effort is applied at end so as to over this end towards the drum | |
| 95. |
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» A. a>b and p acts downwards | |
| 96. |
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» D. drum rotates ccw and p acts downwards | |
| 97. |
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» A. simple band brake | |
| 98. |
A short shoe brake has angle of contact less than____degree. |
| A. | 60 |
| B. | 120 |
| C. | 45 |
| D. | 90 |
| Answer» C. 45 | |
| 99. |
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» A. less than 45 degree | |
| 100. |
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» C. less than 1 | |
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