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- Question
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Options- A. natural aeration of water stream.
- B. photosynthetic action of algae.
- C. both (a) & (b).
- D. neither (a) nor (b).
- Correct Answer
- both (a) & (b).
- 1. Pick out the correct statement.
Options- A. When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower.
- B. Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
- C. The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty.
- D. none of these. Discuss
- 2. Mastication of rubber means
Options- A. its softening.
- B. a treatment to retard its deterioration due to oxidation.
- C. improving its curing rate.
- D. depression of its freezing point. Discuss
- 3. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
Options- A. explosion
- B. non biodegradable foam
- C. undesirable plant growth
- D. corrosion Discuss
- 4. During filtration operation, the filtrate encounters the resistance of the
Options- A. filter medium.
- B. cake.
- C. channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium.
- D. all (a), (b) and (c) Discuss
- 5. The maximum delivery pressure of compressors can be upto __________ atmospheres.
Options- A. 10
- B. 100
- C. 250
- D. 1000 Discuss
- 6. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
Options- A. the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
- B. it reduces its calorific value tremendously.
- C. it reduces its flame temperature tremendously.
- D. there are chances of explosion during preheating. Discuss
- 7. If 'S' is the amount available after 'n' interest periods for an initial principal 'P' with the discrete compound interest rate 'i', the present worth is given by
Options- A. (1 + i)n/S
- B. S/(1 + i)n
- C. S/(1 + in)
- D. S/(1 + n)i Discuss
- 8. Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
Options- A. gives higher yield of petrol.
- B. lower octane number of petrol.
- C. higher sulphur content in the product.
- D. higher gum forming material in petrol. Discuss
- 9. Furnace pressure is normally controlled by regulating the
Options- A. air pressure
- B. fuel gas pressure
- C. speed of I.D. fan
- D. damper Discuss
- 10. Mercaptans are added to liquefied petroleum gas (LPG) to
Options- A. reduce its cost.
- B. narrow down its explosion limit.
- C. assist in checking its leakage from cylinder.
- D. increase its calorific value. Discuss
More questions
Correct Answer: Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
Correct Answer: its softening.
Correct Answer: explosion
Correct Answer: all (a), (b) and (c)
Correct Answer: 1000
Correct Answer: the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
Correct Answer: S/(1 + i)n
Correct Answer: gives higher yield of petrol.
Correct Answer: damper
Correct Answer: assist in checking its leakage from cylinder.
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