MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the gap between the rolls is not perfectly flat, which of the following defect can arise from this demerit? |
| A. | Alligatoring |
| B. | Waviness in the sheet |
| C. | Centre burst |
| D. | Stretcher strain |
| Answer» C. Centre burst | |
| 2. |
There is no limit of the possible reduction in the thickness of the sheet metal, provided number of passes needs to increase. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The mill spring in the rolling mill is defined as the phenomena of _____________ |
| A. | recoiling of the roll wheel |
| B. | increase in thickness of rolled sheet after coming out of roll wheel |
| C. | roll flattening |
| D. | change in the gap distance between the rolls with time |
| Answer» C. roll flattening | |
| 4. |
A roll of diameter 1.5 m is used to roll the sheet of width 100 mm. Find the stress on the machine, if the change in thickness of the sample is 10 mm. Given that the rolling pressure is 500 kN? |
| A. | 50 MPa |
| B. | 40.9 MPa |
| C. | 568.2 kPa |
| D. | 48.2 MPa |
| Answer» C. 568.2 kPa | |
| 5. |
A roll of diameter 1.5 m is used to roll the sheet of width 100 mm. The stress on the machine is 50 MPa, and the change in thickness of the sample is 10 mm. Find the rolling pressure of the sheet? |
| A. | 52.3 kN |
| B. | 8258.5 kN |
| C. | 612.3 kN |
| D. | 5682.2 kN |
| Answer» D. 5682.2 kN | |
| 6. |
The neutral point always occurs in the mid-way of entering and exiting point of the metal along the arc of contact. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The roll pressure is always maximum at the neutral point and then falls off sharply. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
For a roll of radius R, the entering and exiting material thickness is h1 and h2 respectively. What will be the total arc of contact between roll and material?Δh=h1-h2 |
| A. | R(Δh) |
| B. | R(√Δh) |
| C. | √(RΔh) |
| D. | R(Δh)2 |
| Answer» D. R(Δh)2 | |
| 9. |
The specific roll pressure is defined as _______________ in the rolling machine. |
| A. | total rolling load |
| B. | total load separating force |
| C. | rolling load/contact area |
| D. | rolling load/roll diameter |
| Answer» D. rolling load/roll diameter | |
| 10. |
The neutral point in the rolling machine is defined as the point where ________ |
| A. | the material enters the machine |
| B. | the material exits the machine |
| C. | the roll speed is equal to the material flow speed |
| D. | the friction between the roll and the material is zero |
| Answer» D. the friction between the roll and the material is zero | |