A. Is friable, charcoal like substance
B. Has highest fixed carbon and lowest volatile matter content of all the four banded components
of coal
C. Is non-coking, but when blended with highly coking coal, controls its swelling and produces
high strength coke on carbonisation
D. All A., B. and C.
Related Mcqs:
- Mott and Wheeler test is conducted on coke to find its _____________________?
A. Reactivity with O2
B. Abradability
C. Phosphorus content
D. Volatile matter content - A coal gasifier operating at 20 atm. (e.g. Lurgi gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having _____________________?
A. Higher methane content and thus higher calorific value
B. Higher carbon monoxide content
C. Lower carbon dioxide content
D. None of these - The catalyst used in shift converter is _____________________?
A. Nickel
B. Vanadium
C. Silica gel
D. Alumina - Percentage of methane in coke oven gas may be around _____________________?
A. 5
B. 15
C. 25
D. 50 - Natural draft created by the chimney depends upon _____________________?
A. Temperature of the flue gas
B. Its height
C. Both A. & B.
D. Neither A. nor B. - Presence of free moisture in coal during its high temperature carbonisation _____________________?
A. Reduces the coking time
B. Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot
oven walls
C. Increases the loss of fine coal dust from the ovens when charging
D. None of these - Natural draught produced by a chimney depends upon the _____________________?
A. Density of the chimney gases
B. Height of the chimney
C. Both A. and B.
D. Neither A. nor B. - 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. - Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?
A. MgO & Na2CO3
B. MgSO4 & BaCl2
C. BaSO4 & NaCl
D. MgCO3 & NaCl - Nitrogen in coal_________________?
A. Is present upto 1-2%
B. Comes from protein in parent vegetable matter
C. Is recovered as ammonia during its carbonisation
D. All A., B. and C.
