MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Polymer Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What type of phenolics is extensively used as objects of art and jewellery? |
| A. | tlaminated phenolics |
| B. | tcast phenolics |
| C. | toil-soluble phenolics |
| D. | tresols |
| Answer» C. toil-soluble phenolics | |
| 2. |
Why is a stainless steel kettle used in the production of casting grade phenolics? |
| A. | tto minimize corrosion |
| B. | tto minimize color formation |
| C. | tto maximize color formation |
| D. | tto increase strength |
| Answer» C. tto maximize color formation | |
| 3. |
What is the approximate phenol formaldehyde ratio used is the preparation of casting grade phenolic resins? |
| A. | t1:2.2 |
| B. | t2:1 |
| C. | t3:1 |
| D. | t1:2 |
| Answer» B. t2:1 | |
| 4. |
What are the temperature and pressure conditions in compression moulding technique in the moulding of phenolic moulding powder? |
| A. | t160-170 C and 1500-3000 psi |
| B. | t100-120 C and 1000-1500 psi |
| C. | t160-170 C and 500-1000 psi |
| D. | t100-200 C and 1500-3000 psi |
| Answer» B. t100-120 C and 1000-1500 psi | |
| 5. |
Which of the following phenolic resins are suitable for the decorative laminates? |
| A. | tcaustic soda catalyzed resols |
| B. | tammonia catalyzed resols |
| C. | tspirit resols |
| D. | tresites |
| Answer» B. tammonia catalyzed resols | |
| 6. |
Resin P, on further heating turns into completely cross-linked resin Q, which is totally insoluble and infusible. Resin P is slightly heat fusible and insoluble in alkalis and alcohols but partly soluble in acetone. What are the names of resin P and Q? |
| A. | tresol and resitol |
| B. | tresitol and resite |
| C. | tresol and resite |
| D. | tnone of the mentioned |
| Answer» C. tresol and resite | |
| 7. |
What is the name of the B- staged resin formed in resinification process? |
| A. | tresol |
| B. | tresitol |
| C. | tresite |
| D. | tnovolac |
| Answer» C. tresite | |
| 8. |
If the resinification reaction is stopped at early stages, a low molecular weight product A, having 3-4 aromatic rings and 3-5 methylol groups, which is soluble in alkalis and alcohol is formed. What is the name of the product A? |
| A. | tresole |
| B. | tresitol |
| C. | tresite |
| D. | tnovolac |
| Answer» B. tresitol | |
| 9. |
How many methylol groups are present in a typical novolac molecule? |
| A. | t3-5 |
| B. | t6-8 |
| C. | t0 |
| D. | t2 |
| Answer» D. t2 | |