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- Question
Pick out the wrong statement.
Options- A. If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour.
- B. The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding.
- C. The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps.
- D. none of these.
- Correct Answer
- none of these.
- 1. The normal range of velocity of steam in pipes is __________ m/sec.
Options- A. 0.1-0.5
- B. 1-5
- C. 10-20
- D. 80-100 Discuss
- 2. Which one contains minimum percentage of SiO2?
Options- A. Firebrick
- B. Sillimanite
- C. Semi-silica
- D. Aluminous firebrick Discuss
- 3. Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the
Options- A. sizes of the component molecules are approximately equal.
- B. attractive forces between like and unlike molecules are approximately equal.
- C. component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution.
- D. all (a), (b) & (c). Discuss
- 4. __________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR.
Options- A. Percent elongation
- B. Resilience
- C. Freezing point
- D. Strength Discuss
- 5. Polymethyl methacrylate (PMMA) which is also known as perspex and is produced by bulk polymerisation of methyl methacrylate is not a __________ polymer.
Options- A. thermoplastic
- B. thermosetting
- C. linear
- D. glass like transparent Discuss
- 6. Pick out the wrong statement:
Options- A. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure.
- B. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a 'superheated vapor'.
- C. The temperature at which a vapor is saturated is termed as the boiling point.
- D. The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its 'degree of superheat'. Discuss
- 7. Refractoriness under load (RUL) is the most important property for the refractory bricks
Options- A. at the hearth bottom of the furnace on which stock is placed.
- B. used for furnace insulation.
- C. used in the roof of the furnace.
- D. none of these. Discuss
- 8. Fouling factor
Options- A. is a dimensionless quantity.
- B. does not provide a safety factor for design.
- C. accounts for additional resistances to heat flow.
- D. none of these. Discuss
- 9. Pickout the wrong statement.
Options- A. Polymers made of only one monomer is called homopolymer.
- B. Polymers made of more than one monomer is called copolymer or mixed polymer.
- C. Vulcanised rubber is more elastic than natural rubber.
- D. The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres. Discuss
- 10. Maximum production start up cost for making a chemical plant operational is about __________ percent of the fixed capital cost.
Options- A. 1
- B. 5
- C. 10
- D. 30 Discuss
More questions
Correct Answer: 80-100
Correct Answer: Sillimanite
Correct Answer: all (a), (b) & (c).
Correct Answer: Resilience
Correct Answer: thermosetting
Correct Answer: The temperature at which a vapor is saturated is termed as the boiling point.
Correct Answer: at the hearth bottom of the furnace on which stock is placed.
Correct Answer: accounts for additional resistances to heat flow.
Correct Answer: Polymers made of only one monomer is called homopolymer.
Correct Answer: 10
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