Discussion
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- Question
Polypropylene compared to polythene is
Options- A. harder
- B. stronger
- C. lighter
- D. all (a), (b) and (c)
- Correct Answer
- all (a), (b) and (c)
- 1. Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from __________ resins.
Options- A. epoxy
- B. phenol formaldehyde
- C. urea formaldehyde
- D. melamine formaldehyde Discuss
- 2. Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used
Options- A. for surface coating of automobiles & air crafts.
- B. for fibre making.
- C. as plasticiser for PVC & nitrocellulose.
- D. for film forming materials. Discuss
- 3. Vulcanisation of raw rubber makes it
Options- A. soft
- B. less elastic
- C. plastic
- D. tacky Discuss
- 4. Amino resins are used in paper treatment to improve its
Options- A. wet tear and bursting strength.
- B. folding endurance
- C. wet rub resistance
- D. all (a), (b) & (c) Discuss
- 5. Plastic articles are normally produced by __________ moulding.
Options- A. green sand
- B. injection
- C. shell
- D. dry sand Discuss
- 6. Pick out the wrong statement.
Options- A. Cold SBR is superior as compared to hot SBR.
- B. Polymerisation temperature can modify the properties of SBR.
- C. Production of cold SBR employs lower pressure as compared to that of hot SBR.
- D. None of these. Discuss
- 7. Pick out the wrong statement.
Options- A. Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre.
- B. Crimp is a measure of the difference between the length of the straightened and unstraightend fibre.
- C. Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
- D. Nylon fibres have greater water absorption capacity than polyester fibres. Discuss
- 8. In case of a ball mill,
Options- A. coarse feed requires a larger ball.
- B. fine feed requires a larger ball.
- C. operating speed should be more than the critical speed.
- D. none of these Discuss
- 9. Pine oil used in froth floatation technique acts as a/an
Options- A. collector
- B. modifier
- C. frother
- D. activator Discuss
- 10. The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
Options- A. N°
- B. N1
- C. N2
- D. N3 Discuss
Polymer Technology problems
Search Results
Correct Answer: urea formaldehyde
Correct Answer: for fibre making.
Correct Answer: less elastic
Correct Answer: all (a), (b) & (c)
Correct Answer: injection
Correct Answer: None of these.
Correct Answer: Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
Correct Answer: coarse feed requires a larger ball.
Correct Answer: frother
Correct Answer: N2
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