MCQOPTIONS
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MCQOPTIONS
This section includes 11 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 coefficient of friction of material with the roll is 0.2, find the angle of a bite? |
| A. | 11.3 degree |
| B. | 16.25 degrees |
| C. | 21.02 degrees |
| D. | 71.29 degrees |
| Answer» B. 16.25 degrees | |
| 2. |
Find the angle of contact for an arc on a roll having the maximum reduction equal to 2 mm and roll diameter 800 mm? |
| A. | 2.86 degrees |
| B. | 4.28 degrees |
| C. | 82.2 degrees |
| D. | 54 degrees |
| Answer» B. 4.28 degrees | |
| 3. |
The position of the neutral point in rolling does not depend upon __________ |
| A. | diameter of roll |
| B. | percentage of reduction |
| C. | coefficient of friction |
| D. | composition of material |
| Answer» E. | |
| 4. |
Find the coefficient of friction of the roll having diameter 100 mm and the maximum possible reduction is 1 mm? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.5 |
| D. | 1 |
| Answer» C. 0.5 | |
| 5. |
The sheet has an initial thickness of 30 mm with roll diameter of 300 mm and coefficient of friction equal to 0.2. Find the final thickness of the sample in case maximum reduction is carried out in a single pass? |
| A. | 12 mm |
| B. | 18 mm |
| C. | 24 mm |
| D. | 30 mm |
| Answer» C. 24 mm | |
| 6. |
The arc of contact between the roll and the workpiece is circular in geometry, and its radius is smaller than the roll radius. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Which of the following statement is correct about the coefficient of friction between the roll and workpiece? |
| A. | The coefficient of friction is constant throughout the arc of contact |
| B. | The coefficient of friction always acts in a single direction throughout the arc of contact |
| C. | The friction force act opposite to roll direction in the entrance and along the roll direction in exit |
| D. | The friction force act in the roll direction in entrance and opposite to the roll direction in exit |
| Answer» E. | |
| 8. |
Appling the back tension on workpiece will shift the neutral point towards ____________ |
| A. | exit of roll |
| B. | entrance of roll |
| C. | does not shift |
| D. | depends upon the magnitude of the force |
| Answer» B. entrance of roll | |
| 9. |
The roll separating force between the rolls can be decreased by lowering the friction between the workpiece and the rolls. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The roll separating force between the rolling rolls will increase if _____________ |
| A. | roll diameter increases |
| B. | roll diameter decreases |
| C. | number of rolls increases |
| D. | number of rolls decreases |
| Answer» B. roll diameter decreases | |
| 11. |
The earing defect in the rolling of the work piece is not caused by _________ |
| A. | too high speed |
| B. | low clearance between the roll and workpiece |
| C. | blank holding |
| D. | material dependent |
| Answer» C. blank holding | |