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- Question
Sulphuric acid mist is arrested by using a __________ scrubber.
Options- A. packed wet
- B. hollow wet
- C. venturi
- D. co-current
- Correct Answer
- venturi
- 1. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
Options- A. CO2
- B. SO2
- C. hydrocarbons
- D. CFC (chloro fluoro carbon) Discuss
- 2. Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about
Options- A. 1 to 2°
- B. 2 to 5°
- C. 5 to 10°
- D. 10 to 15° Discuss
- 3. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is
Options- A. 0.1
- B. 0.4
- C. 0.6
- D. none of these Discuss
- 4. Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
Options- A. Sphere
- B. Cube
- C. Cylinder (L/D = 1)
- D. Raschig rings Discuss
- 5. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Options- A. transportation of coal.
- B. drying of coal.
- C. combustion of coal by supplying it around the burner.
- D. preheating the primary air. Discuss
- 6. Pick out the wrong statement.
Options- A. A slight haze at the top of chimney indicates good combustion in the furnace.
- B. A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature.
- C. Electrostatic precipitator is the most efficient dust collection equipment for removal of sub-micronic dust particles present in flue gas.
- D. none of these. Discuss
- 7. For separation of sugar solution from settled out mud, we use a __________ filter.
Options- A. sparkler
- B. plate and frame
- C. centrifugal
- D. rotary drum vaccum Discuss
- 8. Typical specifications for design stipulates the gain margin and phase margin to be respectively
Options- A. > 1.7 and > 30°
- B. < 1.7 and > 30°
- C. < 1.7 and < 30°
- D. > 1.7 and < 30° Discuss
- 9. Which of the systems having following transfer functions is stable?
Options- A. 1/(s2+ 2)
- B. 1/(s2-2s + 3)
- C. 1/(s2 + 2s + 2)
- D. exp(-20s)/(s2 + 2s-l) Discuss
- 10. Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the
Options- A. light metal powder down upto 4 meshsize.
- B. dry chemicals.
- C. heavy tonnages of rocks or gravel.
- D. powdered food & granular materials. Discuss
More questions
Correct Answer: CFC (chloro fluoro carbon)
Correct Answer: 2 to 5°
Correct Answer: 0.6
Correct Answer: Sphere
Correct Answer: combustion of coal by supplying it around the burner.
Correct Answer: A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature.
Correct Answer: centrifugal
Correct Answer: > 1.7 and > 30°
Correct Answer: 1/(s2 + 2s + 2)
Correct Answer: heavy tonnages of rocks or gravel.
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