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- Question
Polluted water having low BOD are most economically treated in
Options- A. sedimentation tanks
- B. oxidation ponds
- C. sludge digester
- D. clarifier
- Correct Answer
- oxidation ponds
- 1. Corrosion in boilers can be prevented by
Options- A. deaeration of feed water.
- B. enhancing pH of feed water by adding alkali.
- C. feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion.
- D. all (a), (b) and (c). Discuss
- 2. Pick out the wrong statement.
Options- A. Activity co-efficient is dimensionless.
- B. In case of an ideal gas, the fagacity is equal to its pressure.
- C. In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component.
- D. The fugacity co-efficient is zero for an ideal gas. Discuss
- 3. Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.
Options- A. 1st
- B. zeroth
- C. 3rd
- D. none of these Discuss
- 4. Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
Options- A. decreases
- B. increases
- C. remains unchanged
- D. may increase or decrease; depends on the machine Discuss
- 5. Mesh indicates the number of holes per
Options- A. square inch
- B. linear inch
- C. square foot
- D. linear foot Discuss
- 6. For the irreversible elementary reactions in parallel viz
, the rate of disappearance of 'X' is equal to
Options- A. CA(K1+K2)
- B. CA(K1 + K2)/2
- C. CA . K1/2
- D. CA . K2/2 Discuss
- 7. The number of neutrons in the nucleus of Uranium-233 (92U233) is
Options- A. 141
- B. 92
- C. 233
- D. 325 Discuss
- 8. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ? = bulk density of material, kg/m3)
Options- A. 3.6 W.D.V.?
- B. 3.6 W.D.V.
- C. 3.6 W.V.?
- D. 3.6 D.V.? Discuss
- 9. Septic tanks are used for the __________ of the deposited solids.
Options- A. separation
- B. anaerobic decomposition
- C. aerobic decomposition
- D. none of these Discuss
- 10. The process by which fine solids is removed from liquids is termed as
Options- A. decantation
- B. flocculation
- C. sedimentation
- D. classification Discuss
More questions
Correct Answer: all (a), (b) and (c).
Correct Answer: The fugacity co-efficient is zero for an ideal gas.
Correct Answer: zeroth
Correct Answer: decreases
Correct Answer: linear inch
Correct Answer: CA(K1+K2)
Correct Answer: 141
Correct Answer: 3.6 W.D.V.?
Correct Answer: anaerobic decomposition
Correct Answer: sedimentation
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