Chemical Engineering - Polymer Technology

36. 

Silicone resins, which are highly water repellant and has good heat resistance can not be used

A. as room temperature adhesive.
B. as grease & lubricant.
C. hydraulic fluid for heat transfer.
D. resin for lamination.

Answer: Option A

Explanation:

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37. 

Pick out the wrong statement.

A. Addition polymers are generally formed by chain growth polymerisation.
B. Condensation polymers are generally formed by step growth polymerisation.
C. Teflon is formed by step growth polymerisation.
D. Bakelite is formed by step growth polymerisation.

Answer: Option C

Explanation:

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38. 

Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?

A. Butyl rubber
B. Silicon rubber
C. Nitrile rubber
D. Silicone rubber

Answer: Option D

Explanation:

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39. 

Nylon-66 compared to nylon-6 has

A. lower melting point.
B. more abrasion resistant properties.
C. higher hardness.
D. all (a), (b) and (c).

Answer: Option C

Explanation:

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40. 

Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.

A. improving the stretchability
B. dyeing/colouring
C. detergent solution washing
D. glycol soaking

Answer: Option C

Explanation:

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