Discussion
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- Question
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Options- A. low emissivity
- B. high thermal conductivity
- C. both (a) and (b)
- D. neither (a) nor (b)
- Correct Answer
- both (a) and (b)
- 1. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?
Options- A. Ammonia
- B. Fine dolomite
- C. Alkaline powders
- D. None of these Discuss
- 2. In producer gas making furnace, steam is added along with air to mainly control the
Options- A. fusion of coal ash & clinker formation.
- B. C. V. of producer gas.
- C. temperature of producer gas.
- D. tar content in producer gas. Discuss
- 3. In a furnace employing forced draught as compared to induced draught,
Options- A. air is sucked in, so air leaks are more and hence the furnace efficiency is reduced.
- B. the fan operates hot and hence blades are liable to corrosion and erosion.
- C. positive pressure exists in the furnace.
- D. none of these Discuss
- 4. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
Options- A. 250
- B. 650
- C. 850
- D. 1000 Discuss
- 5. Tunnel kilns are usually used for
Options- A. roasting of pyrites.
- B. drying/tempering of refractories.
- C. reheating of slabs.
- D. melting of glass. Discuss
- 6. Large tonnage of refractory bricks are dried in a
Options- A. shaft furnace
- B. rotary hearth furnace
- C. tunnel kiln
- D. muffle furnace Discuss
- 7. Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called
Options- A. fumes
- B. mists
- C. smoke
- D. aerosols Discuss
- 8. Turbidity of water is an indication of the presence of
Options- A. suspended inorganic matter
- B. dissolved solids
- C. floating solids
- D. dissolved gases Discuss
- 9. TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.
Options- A. 0.1
- B. 25
- C. 100
- D. 1000 Discuss
- 10. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
Options- A. Reynold stresses
- B. shear forces
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Furnace Technology problems
Search Results
Correct Answer: None of these
Correct Answer: fusion of coal ash & clinker formation.
Correct Answer: positive pressure exists in the furnace.
Correct Answer: 650
Correct Answer: drying/tempering of refractories.
Correct Answer: tunnel kiln
Correct Answer: aerosols
Correct Answer: suspended inorganic matter
Correct Answer: 0.1
Correct Answer: both (a) & (b)
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