MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A taper roller bearing has a dynamic load capacity of 26 kN. The desired life for 90% of the bearings is 8000 hr and the speed is 300 r.p.m. The equivalent radial load that the bearing can carry will be nearly |
| A. | 5854 N |
| B. | 5645 N |
| C. | 5436 N |
| D. | 5227 N |
| Answer» B. 5645 N | |
| 2. |
In journal bearing length and diameter is equal, is known as |
| A. | Long bearing |
| B. | Medium bearing |
| C. | Short bearing |
| D. | Square bearing |
| Answer» E. | |
| 3. |
A tapered roller bearing |
| A. | is the same as a needle bearing |
| B. | is designed such that all elements in the roller surface and raceways intersect at a common point on the bearing axis. |
| C. | cannot take radial loading |
| D. | cannot take thrust loading |
| Answer» C. cannot take radial loading | |
| 4. |
Journal bearing works satisfactorily with L/D ratio in the range of:[where, L = Length of bearing, D = Diameter of journal] |
| A. | 1 - 2 |
| B. | 10 - 20 |
| C. | 0.1 – 0.2 |
| D. | 0.01 – 0.1 |
| Answer» B. 10 - 20 | |
| 5. |
Bearing characteristics no. is represented by: |
| A. | \(\frac{\mu P}{N}\) |
| B. | μNP |
| C. | \(\frac{P}{\mu N}\) |
| D. | \(\frac{\mu N}{P}\) |
| Answer» E. | |
| 6. |
If ‘w’ is the load on a cylindrical journal of diameter (d) and length (l), then bearing pressure is |
| A. | \(\frac{w}{ dl}\) |
| B. | \(\frac{w}{\pi dl}\) |
| C. | \(\frac{4w}{\pi d^2 l}\) |
| D. | \(\frac{2w}{\pi d^2}\) |
| Answer» B. \(\frac{w}{\pi dl}\) | |
| 7. |
If the load on a ball bearing is halved, its life |
| A. | Remains unchanged |
| B. | Increases two times |
| C. | Increases four times |
| D. | Increases eight times |
| Answer» E. | |
| 8. |
Ball bearing races are |
| A. | Turned |
| B. | Ground |
| C. | Nickel plated |
| D. | Lapped |
| Answer» E. | |
| 9. |
In case of a sliding contact bearing, the bearing characteristic number is given by(where, Z = Viscosity, N = Speed, P = Pressure): |
| A. | \(\frac{{ZP}}{N}\) |
| B. | \(\frac{{ZN}}{P}\) |
| C. | \(\frac{Z}{{NP}}\) |
| D. | \(\frac{P}{{ZN}}\) |
| Answer» C. \(\frac{Z}{{NP}}\) | |
| 10. |
If Bearing Pressure P, Absolute Viscosity Z, and Speed of journal N are doubled, then bearing characteristic number to its original number will be |
| A. | 1/2 |
| B. | 2 times |
| C. | 1/4 |
| D. | 4 times |
| Answer» C. 1/4 | |
| 11. |
Antifriction bearings are:- |
| A. | Sleeve bearings |
| B. | Hydrodynamic bearings |
| C. | Thin lubricated bearings |
| D. | Ball and roller bearings |
| Answer» E. | |
| 12. |
Mechanical seals are used |
| A. | to prevent vibrations |
| B. | to prevent leakage |
| C. | to reduce friction |
| D. | to balance the equipment |
| Answer» C. to reduce friction | |