Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher __________________?

Related Mcqs:

1. Coal tar fuel – 200 (CTF 200) is a mixture of __________________?

   A. Pitch and creosote oil
   B. Light oil and pitch
   C. Anthracene and crecosote oil
   D. Solar oil and pitch

2. Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about _______________ percent?

   A. 5
   B. 25
   C. 55
   D. 75

3. ombustion of pulverised coal compared to the lumpy coal __________________?

   CA. Provides better control of furnace temperature
   B. Facilitates combustion with lower excess air
   C. Provides higher thermal efficiency & flame temperature
   D. All A., B. & C.

4. Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?

   A. 1000
   B. 4000
   C. 6000
   D. 8000

5. Tar is a better fuel than furnace oil, because of its___________________?

   A. Higher calorific value
   B. Lower sulphur content
   C. Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate
   D. Both A. and B.

6. A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________?

   A. Is less liable to spontaneous combustion on storage
   B. Is more difficult to ignite and produces a shorter flame
   C. Requires smaller combustion space and less secondary air
   D. None of these

7. Combustion of pulverised coal as compared to that of lump coal ________________?

   A. Develops a non-luminous flame
   B. Develops a low temperature flame
   C. Can be done with less excess air
   D. Provides a lower rate of heat release

8. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?

   A. 3 & 10
   B. 10 & 3
   C. 10 & 20
   D. 15 & 8

9. Coal tar (produced by high temperature carbonisation) is the main source of_________________?

   A. Aromatic compounds
   B. Aliphatic compounds
   C. Paraffins
   D. Olefins

10. Coal tar (produced by high temperature carbonization) is the main source of_________?

    A. Aromatic compounds
    B. Aliphatic compounds
    C. Paraffins
    D. Olefins

    Submitted by: Muhammad Mutsadiq Umer