MCQOPTIONS
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MCQOPTIONS
This section includes 7 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. |
The nominal diameter of the screw is 22mm and the allowable bearing pressure for the nut is 15N//mm . Find the length of the nut if pitch of the screw is |
| A. | 15mm |
| B. | 20mm |
| C. | 25mm |
| D. | 30mm |
| Answer» B. 20mm | |
| 2. |
If bending stress in a screw is of magnitude 95N/mm and torsional shear stress of magnitude 15N/mm , then what is the principal shear stress? |
| A. | 48.7N/mm |
| B. | 54.3 N/mm |
| C. | 51.4 N/mm |
| D. | 49.8 N/mm |
| Answer» E. | |
| 3. |
Find the torsional shear stress to which a screw of nominal diameter 22mm is subjected when the clamp exerts a force of 5kN on it. The screw is double threaded and pitch of screw is 5mm.Given: Coefficient of friction is 0.15. |
| A. | 25.45N/mm |
| B. | 21.29N/mm |
| C. | 31.21N/mm |
| D. | 35.65N/mm |
| Answer» C. 31.21N/mm | |
| 4. |
Find the bending stress to which a screw of nominal diameter 22mm is subjected when the clamp exerts a force of 5kN acts on it. The screw is double threaded and pitch of screw is 5mm.Given: Coefficient of friction is 0.15.It is assumed operator exerts a force of 250N at the handle of length 275mm. |
| A. | 123.45N/mm |
| B. | 132.54N/mm |
| C. | 142.54N/mm |
| D. | 124.45N/mm |
| Answer» D. 124.45N/mm | |
| 5. |
A machine vice whose length of the handle is 150mm and the coefficient of friction for thread and collar are 0.15 and 0.17 respectively has a force applied at handle of 125N. Also the outer and inner diameters of collar are 55mm and 45mm respectively. Find the overall efficiency if nominal diameter=22mm and pitch=5mm. |
| A. | 18.12% |
| B. | 12.18% |
| C. | 21.23% |
| D. | 23.21% |
| Answer» C. 21.23% | |
| 6. |
A machine vice whose length of the handle is 150mm and the coefficient of friction for thread and collar are 0.15 and 0.17 respectively has a force applied at handle of 125N. Also the outer and inner diameters of collar are 55mm and 45mm respectively. Find the clamping force W if nominal diameter=22mm and pitch=5mm. |
| A. | 4539.45N |
| B. | 2868.73N |
| C. | 3657.56N |
| D. | 2134.34N |
| Answer» C. 3657.56N | |
| 7. |
If for a trapezoidal thread, angle of thread is 15 then what will be the replacement of the coefficient of friction which is 0.15. |
| A. | 0.1553 |
| B. | 0.1335 |
| C. | 0.1667 |
| D. | 0.1776 |
| Answer» B. 0.1335 | |