MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the reaction at pivot in horizontal direction. Assume coefficient of friction as 0.2. |
| A. | None of the listed |
| B. | 21123N |
| C. | 17200N |
| D. | 16789N |
| Answer» D. 16789N | |
| 2. |
A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the torque capacity f each shoe. Assume coefficient of friction as 0.2. |
| A. | 789N-m |
| B. | 1081N-m |
| C. | 945N-m |
| D. | None of the listed |
| Answer» C. 945N-m | |
| 3. |
A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Calculate the distance of pivot from axis of drum. |
| A. | 321.5mm |
| B. | 314.3mm |
| C. | 289.5mm |
| D. | None of the mentioned |
| Answer» C. 289.5mm | |
| 4. |
Shoe is constrained to move towards the drum to compensate for the moment acting. |
| A. | Yes |
| B. | It compensates for wear |
| C. | It compensates for both wear and moment |
| D. | None of the listed |
| Answer» C. It compensates for both wear and moment | |
| 5. |
The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ[4Sinθ/2θ+sin4θ]. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
A_PIVOTED_DOUBLE_BLOCK_BRAKE_HAS_A_DRUM_RADIUS_OF_280MM_WITH_TWO_SHOES_SUBTENDING_AN_ANGLE_OF_100‚ÄÖ√Ñ√∂‚ÀÖ√Ñ‚ÄÖ√†√ª._CALCULATE_THE_DISTANCE_OF_PIVOT_FROM_AXIS_OF_DRUM.?$# |
| A. | 321.5mm |
| B. | 314.3mm |
| C. | 289.5mm |
| D. | None of the mentioned |
| Answer» C. 289.5mm | |
| 7. |
A_pivoted_double_block_brake_has_a_drum_radius_of_280mm_with_two_shoes_subtending_an_angle_of_100⁰._Maximum_pressure_intensity_is_0.5N/mm²._If_the_width_of_friction_lining_is_90mm,_find_the_torque_capacity_f_each_shoe._Assume_coefficient_of_friction_as_0.2.$# |
| A. | 789N-m |
| B. | 1081N-m |
| C. | 945N-m |
| D. | None of the listed |
| Answer» C. 945N-m | |
| 8. |
A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the reaction at pivot in horizontal direction. Assume coefficient of friction as 0.2.$ |
| A. | None of the listed |
| B. | 2113N |
| C. | 1720N |
| D. | 3440N |
| Answer» E. | |
| 9. |
Shoe is constrained to move towards the drum to compensate for the moment acting? |
| A. | Yes |
| B. | It compensates for wear |
| C. | It compensates for both wear and moment |
| D. | None of the listed |
| Answer» C. It compensates for both wear and moment | |
| 10. |
In pivoted block brakes, moment of frictional force about pivot is non zero. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ[4Sinθ/2θ+sin4θ].$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
The pressure intensity at an element on long shoe brake varies directly with the sin of the pressure angle of the element of friction lining. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
In a block brake with short shoe, it is assumed that friction force and normal reaction are concentrated at the midpoint of the shoe. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
If initially drum of radius 200mm is rotating at 100rpm, then calculate the heat generated if frictional force acting is 1140N. |
| A. | 3345W |
| B. | 4456W |
| C. | 5969W |
| D. | 11938W |
| Answer» D. 11938W | |
| 15. |
If torque capacity of a block brake is 240N-m and radius of drum is 210mm with coefficient of friction 0.4. |
| A. | None of the listed |
| B. | 2857.14N |
| C. | 3443.42N |
| D. | 2334.62N |
| Answer» C. 3443.42N | |
| 16. |
Block brakes are never used in railway trains. |
| A. | True |
| B. | False |
| Answer» C. | |