Engineering Questions with Answers - Multiple Choice Questions
Chemical Process Technology MCQ’s – Natural Products – Coal Industry
1 - Question
Coal is a hydrogen rich hydrocarbon. Is the statement true/false?
Explanation: The statement is wrong as the general chemical formula of coal is (C3H4)x, which clearly states that it is a hydrogen-deficient hydrocarbon and has interlocked aromatic rings.
2 - Question
Which of the following statements regarding coal are correct?
a) Coking coals do not soften on heating
b) Non coking coals soften on heating
c) Coke is an oxidizing agent
d) Coal is a hydrogen deficient hydrocarbon
Explanation: Coking coals soften and non coking coals do not soften on heating. The product formed during heating of non coking coal is called char. Coke is a reducing agent as it is hydrogen deficient hydrocarbon.
3 - Question
The gas from the oven in Coking process of coal is scrubbed with H2S04 to remove ammonia. Is the statement true/false?
Explanation: The statement is true and the gas from the oven is cooled to remove tars, to remove aromatics it is scrubbed with light oil, scrubbed with sulfuric acid to remove ammonia leaving behind coal gas.
4 - Question
Which of the following way is used to fed hydrogenation processes in hydrogenation of coal?
a) Feeding the non powdered coal directly in presence of oxygen
b) By feeding paste of pulverized coal and heavy oil
c) Treating of non powered coal by solvent extraction
d) Feeding the non powdered coal directly along with stream of hydrogen
Explanation: Various ways used for feeding coal to hydrogenation processes are i. Treating powdered coal by solvent extraction and then feeding ii. By feeding paste of pulverized coal and heavy oil iii. Feeding powdered coal directly with stream of hydrogen.
5 - Question
Catalyst used in hydrogenation of coal is ___________________
a) Titanium oxide
b) Chromium oxide
c) Manganese oxide
Explanation: 1% solution of Titanium oxide or molybdenum oxide is used as catalyst in hydrogenation of coal to impregnate the coal into reaction zone.
6 - Question
The inlet speeds of coal dust and oxygen blown into gasification chamber are _________ than the velocity of flame propagation
c) Greater than or equal to
d) Less than or equal to
Explanation: The inlet speeds of coal dust and oxygen must be higher than velocity of flame propagation. Then at the base of chamber ash falls into water seal and hot gases escape through top of the chamber.
7 - Question
Which material of construction is used in reactor steels(hydrogenation of coal) to avoid hydrogen embrittlement?
a) Tool steel
b) Chromium-molybdenum steel
c) Stainless steel
d) Carbon steel
Explanation: Chromium-molybdenum steels are used as material of construction in reactor steels to avoid hydrogen embrittlement. Coal must be fed in powdered form into the hydrogenators reactor.