MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
Which catalyst is used in the production of electrical grade laminates from m-f resin? |
| A. | triethanolamine |
| B. | sodium carbonate |
| C. | sodium hydroxide |
| D. | ethanamine |
| Answer» B. sodium carbonate | |
| 2. |
What is the extensive use of melamine-formaldehyde resins? |
| A. | decorative laminates |
| B. | stove enamels |
| C. | air-drying lacquers |
| D. | art and jewellery |
| Answer» B. stove enamels | |
| 3. |
What are the temperature and pressure conditions for the compression moulding of m-f resin? |
| A. | 200-250 C and 1000-3000 psi |
| B. | 150-170 C and 2000-8000 psi |
| C. | 150-170 C and 1000-3000 psi |
| D. | 200-250 C and 2000-8000 psi |
| Answer» C. 150-170 C and 1000-3000 psi | |
| 4. |
WHAT_ARE_THE_TEMPERATURE_AND_PRESSURE_CONDITIONS_FOR_THE_COMPRESSION_MOULDING_OF_M-F_RESIN??$ |
| A. | 200-250 C and 1000-3000 psi |
| B. | 150-170 C and 2000-8000 psi |
| C. | 150-170 C and 1000-3000 psi |
| D. | 200-250 C and 2000-8000 psi |
| Answer» C. 150-170 C and 1000-3000 psi | |
| 5. |
Which catalyst is used in the production of electrical grade laminates from m-f resin?$ |
| A. | triethanolamine |
| B. | sodium carbonate |
| C. | sodium hydroxide |
| D. | ethanamine |
| Answer» B. sodium carbonate | |
| 6. |
What_is_the_extensive_use_of_melamine-formaldehyde_resins?$ |
| A. | decorative laminates |
| B. | stove enamels |
| C. | air-drying lacquers |
| D. | art and jewellery |
| Answer» B. stove enamels | |
| 7. |
What is the initial molar ratio for melamine to formaldehyde in commercial resinification reaction? |
| A. | 1:3 |
| B. | 1:2 |
| C. | 3:1 |
| D. | 2:1 |
| Answer» B. 1:2 | |
| 8. |
What is the approximate reaction temperature in the formation of melamine, when cyanamide is heated to give dicyandiamide? |
| A. | 300 C |
| B. | 70 C |
| C. | 100 C |
| D. | 180 C |
| Answer» C. 100 C | |
| 9. |
Which of the following is commonly used as hardening agent for urea-formaldehyde resins? |
| A. | ammonium chloride |
| B. | sodium hydroxide |
| C. | aluminium chloride |
| D. | sodium carbonate |
| Answer» B. sodium hydroxide | |
| 10. |
What is the pH requirement for the preparation of adhesive resins from urea formaldehyde resin? |
| A. | 8 |
| B. | 7 |
| C. | 7.5 |
| D. | 9 |
| Answer» D. 9 | |
| 11. |
What is the ratio of urea o formaldehyde to produce useful resins? |
| A. | 1:2 |
| B. | 2:1 |
| C. | 1:1 |
| D. | 1:3 |
| Answer» B. 2:1 | |
| 12. |
Which of the following can be used to improve the shelf-life of moulding powders from urea-formaldehyde resin? |
| A. | ammonium sulphamate |
| B. | magnesium stearate |
| C. | hexamine |
| D. | ammonia |
| Answer» D. ammonia | |
| 13. |
Which of the following is used as a lubricant in the moulding powder from urea-formaldehyde resin? |
| A. | zinc stearate |
| B. | ammonium sulphamate |
| C. | trimethyl phosphate |
| D. | none of the mentioned |
| Answer» B. ammonium sulphamate | |
| 14. |
Which of the following is not a characteristic of a cured urea resin? |
| A. | hard and rigid |
| B. | non-inflammable |
| C. | excellent electrical insulation |
| D. | impart colour and odour to food & drinks |
| Answer» E. | |