Search
.Management Sciences
Category: Fuels and Combustion
Fusion point of coal ash increases with increase in its ____________ content?
A. Iron sulphate
B. Iron silicate
C. Lime and magnesia
D. All A., B. and C.
The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
A. Type (solid, liquid or gaseous)
B. Calorific value
C. Sulphur content
D. Ignition temperature
In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?
A. Ammonia yield is more
B. Aliphatic tar is produced
C. Free carbon in tar is more
D. All A., B. and C.
High ash coals ____________________?
A. Are soft & friable (poor strength and size stability)
B. Require longer time of carbonisation as ash offers resistance to heat transfer
C. Produce larger quantity of coke oven gas
D. None of these
Producer gas containing least amount of tar is produced by the_________________?
A. Partial combustion of coal
B. Partial combustion of large size (< 50 mm) coke
C. High pressure gasification of coal (e.g. in Lurgi gasifier)
D. Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
Which of the following is not used as a binder in coal briquetting ?
A. Tar
B. Molasses
C. Pitch
D. Line
In high temperature carbonisation of coal compared to low temperature carbonisation ?
A. Yield of ammonia is less
B. Aromatic content of tar is low
C. H2 content in the coke oven gas is more
D. Calorific value of the coke oven gas is lower
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
By-products are _____________ recovered in ‘Beehive ovens’ ?
A. Fully
B. Partially
C. Not at all
D. Negligibly
Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?
A. Bomb
B. Boy’s
C. Junkers
D. None of these
Recent Comments