Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?

Related Mcqs:

1. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?

   A. 5
   B. 60
   C. 20
   D. 40

2. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?

   A. Furnace oil with air
   B. Furnace oil with oxygen
   C. Blast furnace gas with air
   D. Blast furnace gas with oxygen

3. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?

   A. < 2
   B. < 5
   C. < 8
   D. < 10

4. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?

   A. Preheating the combustion air
   B. Oxygen enrichment of combustion air
   C. Preheating the fuel gas
   D. All A., B. & C.

5. Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?

   A. 50
   B. 100
   C. 150
   D. 250

6. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?

   A. 350
   B. 750
   C. 1050
   D. 1250

7. Combustion of fuel in a furnace with oxygen enriched air results in higher__________________?

   A. Flue gas volume
   B. Flame temperature
   C. Fuel consumption
   D. Stack loss

8. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?

   A. Increase in calorific value of the fuel
   B. Increase in flame temperature
   C. Reduction in scale losses
   D. Saving in fuel consumption

9. Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?

   A. Increasing the draft in the furnace
   B. Preheating the fuel gas
   C. Oxygen enrichment of combustion air
   D. Preheating the combustion air

10. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?

    A. 50
    B. 65
    C. 85
    D. 99