Hard coke is produced by carborisation of coal at_______________?

Related Mcqs:

1. Coke is produced by__________________?

   A. pulverising coal in inert atmosphere
   B. heating wood in a limited supply of air at temperatures below 300GC
   C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
   D. binding the pulverised coal into brick-etts
   E. enriching carbon in the coal

2. Paramagnetic alpha iron changes to gamma iron at_______________?

   A. 770°C
   B. 910°C
   C. 1440°C
   D. 1539°C
   E. none of the above

3. Hard coke is used in________________?

   A. cement industry
   B. thermal power plant
   C. blast furnace
   D. domestic use
   E. locomotives

4. Carbonation of coal is the process of________________________?

   A. pulverising coal in inert atmosphere
   B. heating wood in a limited supply of air at temperatures below 300°C
   C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
   D. binding the pulverised coal into brick-ettes
   E. enriching carbon in the coal

5. The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?

   A. 0.1 to 0.2 kg
   B. 0.2 to 0.4 kg
   C. 0.6 to 0.8 kg
   D. 1.0 to 1.5 kg
   E. 1.5 to 2 kg

6. The bituminous coal is non-caking if its carbon content is_______________?

   A. 78-81%
   B. 81-85%
   C. 85-90%
   D. 90-95%
   E. 95-100%.

7. During storage, the heating value of coal __________________?

   A. increases
   B. decreases
   C. remains constant
   D. may increase or decrease depending upon the method of storage
   E. none of the above

8. Calorific value of coal is of the order of _______________________?

   A. 200-400 kcal/kg
   B. 800-1200 kcal/kg
   C. 2000-4000 kcal/kg
   D. 5000-8000 kcal/kg
   E. 8000-10,000 kcal/kg

9. Sulphur in coal results in___________________?

   A. causing clinkering and slagging
   B. corroding air heaters
   C. spontaneous combustion during coal storage
   D. facilitating ash precipitation
   E. all of the above

10. The behaviour of coal in a furnace is determained by_______________________?

    A. the content of sulphur
    B. the content of ash and heating value
    C. the proximate analysis
    D. the exact analysis
    E. its type