MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
Extreme pressure causes ______ wear in the bearing parts. |
| A. | Abrasive |
| B. | Corrosive |
| C. | Pitting |
| D. | All of the mentioned |
| Answer» C. Pitting | |
| 2. |
Needles bearing consist of rollers of small diameter and very small length. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The bearing is subjected to a radial load of 4000N. Expected life for 90% bearings is 9000h and shaft is rotating at 1500rpm. Calculate the dynamic load capacity. |
| A. | 42.21kN |
| B. | 37.29kN |
| C. | 26.33kN |
| D. | 35.22kN |
| Answer» C. 26.33kN | |
| 4. |
Calculate the bearing life if expected life for 90% bearings is 9000h and shaft is rotating at 1500rpm. |
| A. | 850 million rev |
| B. | 810 million rev |
| C. | 810 h |
| D. | 850h |
| Answer» C. 810 h | |
| 5. |
In the expression of dynamic load capacity P=XVF(r) + YF(a), V stands for ? |
| A. | Race rotation factor |
| B. | Radial factor |
| C. | Thrust factor |
| D. | None of the listed |
| Answer» B. Radial factor | |
| 6. |
The dynamic load carrying capacity of a bearing is defined as the radial load in radial bearings that can be carried for a minimum life of 1000 revolutions. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
For majority of bearings, actual life is considerably greater than rated life. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
The life of an individual ball bearing is the time period for which it works without any signs of failures. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Which of the following is expression for stribeck equation?(Number of balls=z)? |
| A. | C=kd z/5 |
| B. | C=kd z/15 |
| C. | C=kd z/10 |
| D. | None of the listed |
| Answer» B. C=kd z/15 | |
| 10. |
Stribeck equation gives dynamic load capacity of the bearing. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
A total permanent deformation of 0.0001 of the ball diameter is taken for considering static load capacity of the shaft. |
| A. | True |
| B. | False |
| Answer» B. False | |