At what temperature does the Hand olefin gases are evolved in the process of carbonisation?
  • a) 700oC
  • b) 450oC
  • c) 270oC
  • d) 110oC
What happens when coal is expanded during the plastic stage of caking?
  • a) Closed texture coke is obtained
  • b) Highly swollen open texture coke is obtained
  • c) There is no change in the coal
  • d) Coal breaks into a number of pieces
Coal is a good conductor of heat and electricity.
  • a) True
  • b) False
Which of the following forms a heat barrier in the process of carbonisation?
  • a) Impurities present in the coal
  • b) Moisture present in the coal
  • c) Different structure of the machine
  • d) Thin plastic zone formed by caking coal
Which of the following coals have high rates of carbonisation?
  • a) Non-caking coal
  • b) Caking coal
  • c) Coking coal
  • d) Non-coking coal
In which type of plant does the carbonisation process is done?
  • a) Thermal power plant
  • b) Blast furnace process
  • c) Coke-ovens
  • d) Destructive distillation plant
Which type of carbonisation method is used for obtaining particular types of by-products?
  • a) High temperature carbonisation
  • b) Medium temperature carbonisation
  • c) Low temperature carbonisation
  • d) No by-products are formed
What is done when the coke is too friable for use in carbonisation process?
  • a) It is divided into small pieces
  • b) Its maturity is made decreased
  • c) The ash content is reduced
  • d) It is pulverised
How much yield of coke is produced in low temperature carbonisation?
  • a) 75-80 %
  • b) 60-70 %
  • c) 100 %
  • d) 85-90%
High temperature carbonisation process is used to produce ______________
  • a) Brown coal
  • b) Gas coke
  • c) Coal tar
  • d) Coal gas
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