181. Percentage of nitrogen in blast furnace gas may be around
5
25
55
80
✅ The correct answer is option C.
Fuel and Combustion MCQs
182. About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.
2
3
5
1
✅ The correct answer is option C.
183. By-products are __________ recovered in ‘Beehive ovens’.
Fully
Partially
Not at all
Negligibly
✅ The correct answer is option C.
184. Compound coke ovens are those which can be heated by
Both steam and electrical power
Lean gas (e.g., B.F. gas)
Rich gas (e.g., coke oven gas)
Both B and C
✅ The correct answer is option D.
185. Cannel coal and boghead coal are the examples of
Humic coals
Liptobiolites
Sapropelic coals
None of these
✅ The correct answer is option C.
186. Which of the following is used for making the explosive ‘TNT’?
Benzol
Toluene
Pyridine
Cerosote
✅ The correct answer is option B.
187. KOH solution used in orsat apparatus absorbs
CO₂
SO₂
Both A & B
Neither A nor B
✅ The correct answer is option C.
188. A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that
21% excess air has been used for combustion
21% excess oxygen has been used for combustion
Complete combustion of fuel has taken place
No excess air has been used for combustion
✅ The correct answer is option C.
189. Fuel for a fast breeder nuclear reactor is
Plutonium
Uranium
Radium
Neptunium
✅ The correct answer is option A.
190. Bituminous coal
Ignites less easily than anthracite
Is generally coking
Burns with smoky yellow flame
Both B and C
✅ The correct answer is option D.