231. If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
Low
High
Very high, if the fuel is of low calorific value
None of these
✅ The correct answer is option A.
Fuel and Combustion MCQs
232. Highly reactive coke have lower
Porosity
Coke reactivity index (CRI)
Critical air blast (CAB) value
Both B and C
✅ The correct answer is option C.
233. The fuel ratio of a coal is
The ratio of its percentage of fixed carbon to that of volatile matter
Helpful in estimation of its rank
Both A and B
Neither A nor B
✅ The correct answer is option C.
234. Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as
M = 1.8 A
M = 0.5 A
M = 1.1 A
M = A
✅ The correct answer is option C.
235. Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
80-170
200-300
250-270
280-300
✅ The correct answer is option A.
236. ‘Fuel’ can be defined as a substance which produces heat by
Combustion
Nuclear fission
Nuclear fusion
All of the above
✅ The correct answer is option D.
237. Shatter index of the coke is a measure of its
Strength
Bulk density
Reactivity
None of these
✅ The correct answer is option A.
238. Gross and net calorific value of a fuel will be the same
If its ash content is zero
Ifits carbon content is very low
If its hydrogen/hydrogen compound content is zero
Under no circumstances
✅ The correct answer is option C.
239. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and
Carbon tetrachloride
Sand (40%)
Mineral oil of high viscosity & specific gravity (1.6)
None of these
✅ The correct answer is option B.
240. Producer gas containing least amount of tar is produced by the
Partial combustion of coal
Partial combustion of large size (< 50 mm) coke
High pressure gasification of coal (e.g. in Lurgi gasifier)
Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
✅ The correct answer is option B.