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- Question
Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
Options- A. tensile strength
- B. chemical resistance
- C. flexibility
- D. all (a), (b) & (c)
- Correct Answer
- flexibility
- 1. Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.
Options- A. 1380
- B. 1520
- C. 1710
- D. 1915 Discuss
- 2. Higher viscosity of lubricating oil usually signifies
Options- A. lower Reid vapour pressure.
- B. higher acid number.
- C. higher flash point and fire point.
- D. lower flash point and fire point. Discuss
- 3. Lap joints are preferred for plates having thickness __________ mm.
Options- A. < 12.5
- B. > 3
- C. > 5
- D. 5-10 Discuss
- 4. Combustion of fuel in a furnace with oxygen enriched air results in higher
Options- A. flue gas volume
- B. flame temperature
- C. fuel consumption
- D. stack loss Discuss
- 5. Which of the following has the lowest viscosity (at a given temperature) of all?
Options- A. Naphtha
- B. Kerosene
- C. Diesel
- D. Lube oil Discuss
- 6. Which of the following is not used as a medium for high temperature heating?
Options- A. Dowtherm
- B. mercury
- C. liquid metal (e.g. molten sodium)
- D. fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3) Discuss
- 7. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
Options- A. Ammonium alum
- B. Potassium alum
- C. both a & b
- D. neither a nor b Discuss
- 8. The main use of butadiene is
Options- A. as a plasticiser for unsaturated polyester.
- B. in the manufacture of synthetic rubber.
- C. as an anti-skimming agent in paint.
- D. none of these. Discuss
- 9. Which is a regenerative furnace?
Options- A. Coke oven heating chamber.
- B. Open hearth furnace.
- C. Both (a) and (b).
- D. Neither (a) nor (b). Discuss
- 10. Cost of piping in a fluid processing unit (e.g., distillation) of a chemical process plant is about __________ percent of the fixed capital investment.
Options- A. 4
- B. 13
- C. 22
- D. 34 Discuss
More questions
Correct Answer: 1710
Correct Answer: higher flash point and fire point.
Correct Answer: > 3
Correct Answer: flame temperature
Correct Answer: Naphtha
Correct Answer: mercury
Correct Answer: both a & b
Correct Answer: in the manufacture of synthetic rubber.
Correct Answer: Both (a) and (b).
Correct Answer: 13
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