E-PolyLearning

1. Epoxy resin is a polymer containing two or more following groups called epoxide group or ethoxyline group. It is a
a. polyamide & an elastomer.
b. good adhesive.
c. surface coating agent.
d. both (b) and (c).
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Answer: (d).both (b) and (c).

2. Epoxy resins (i.e., epoxide polymers)
a. A
b. B
c. C
d. D
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Answer: (b).B

3. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its
a. non-wetting characteristic.
b. high thermal conductivity.
c. high crushing strength.
d. none of these.
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Answer: (a).non-wetting characteristic.

4. Firing temperature of magnesite bricks is about __________ °C.
a. 800-1000
b. 1000-1200
c. 1600-1800
d. 2400-2600
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Answer: (c).1600-1800

5. Hollow refractory bricks are made by
a. slip casting
b. hand moulding
c. pressing/machine moulding
d. extrusion
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Answer: (a).slip casting

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