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- Question
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s).
Options- A. 24000
- B. 24
- C. 0.24
- D. 0.44
- Correct Answer
- 0.44
- 1. In a neutral solution
Options- A. H+ ions are absent.
- B. OH- ions are absent.
- C. both H+ and OH- ions are present in very small but equal concentration.
- D. none of these. Discuss
- 2. Which of the following is the most detrimental for water used in high pressure boiler?
Options- A. Silica
- B. Turbidity
- C. Phenol
- D. Dissolved oxygen Discuss
- 3. pH value of an alkaline solution is
Options- A. 7
- B. > 7
- C. < 7
- D. constant over a wide range Discuss
- 4. For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.
Options- A. sodium chloride
- B. sodium carbonate monohydrate
- C. anhydrous sodium sulphate
- D. hypo Discuss
- 5. Smog is
Options- A. nothing but black smoke.
- B. a combination of smoke and fog.
- C. a liquid particle resulting from vapor condensation.
- D. a solid particle e.g. flyash. Discuss
- 6. A coal with high ash content is undesirable, as
Options- A. it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber.
- B. the ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash.
- C. the ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer.
- D. all (a), (b) and (c). Discuss
- 7. The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called
Options- A. downcomer liquid seal
- B. static submergence
- C. skirt clearance
- D. none of these Discuss
- 8. In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
Options- A. 'n'th
- B. (1/n)th
- C. 0.5 nth
- D. 1.5 nth Discuss
- 9. The amount of simple interest during 'n' interest period is (where, i = interest rate based on the length of one interest period, p = principal)
Options- A. p.i.n.
- B. p(1 + i.n)
- C. p(1 + i)n
- D. p(1 - i.n) Discuss
- 10. Pick out the wrong statement.
Options- A. Iso-paraffin crack faster than n-paraf-fin.
- B. Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic.
- C. Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking.
- D. None of these. Discuss
More questions
Correct Answer: both H+ and OH- ions are present in very small but equal concentration.
Correct Answer: Silica
Correct Answer: > 7
Correct Answer: sodium chloride
Correct Answer: a combination of smoke and fog.
Correct Answer: all (a), (b) and (c).
Correct Answer: static submergence
Correct Answer: (1/n)th
Correct Answer: p.i.n.
Correct Answer: Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic.
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