The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always ___________________?

Related Mcqs:

1. 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

2. The difference between total carbon and fixed carbon of coal will be minimum in case of___________________?

   A. Lignite
   B. Bituminous coal
   C. Anthracite
   D. High temperature coke (V.M < 0.5%)

3. Proximate analysis of coal determines its ______________ content?

   A. Moisture, ash, sulphur & volatile matter
   B. Moisture, volatile matter, ash & fixed carbon
   C. Moisture, sulphur, nitrogen & fixed carbon
   D. None of these

4. Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis?

   A. 550
   B. 750
   C. 950
   D. 1150

5. Coal is heated in presence of air to a temperature of about _______________ °C, while determining its ash content for proximate analysis?

   A. 500
   B. 750
   C. 950
   D. 1100

6. Narrow coke ovens as compared to wider coke ovens_________________?

   A. Produce smaller coke
   B. Produce stronger coke
   C. Require less time of carbonisation
   D. All A., B. and C.

7. Width of the coke oven towards coke side is slightly more than that on pusher side to____________________?

   A. Facilitate easy discharging of coke as it swells during carbonisation
   B. Facilitate uniform heating of the oven
   C. Increase the output of the coke
   D. None of these

8. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?

   A. Less reactive
   B. Stronger
   C. Smaller in size
   D. All A., B. & C.

9. Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?

   A. Colour
   B. Moisture content
   C. Ash content
   D. Volatile matter

10. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?

    A. Density
    B. Porosity
    C. Electrical resistivity
    D. None of these