Chemical Engineering Archives

Chemical Engineering

Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.

3761. An increase in the NH₃/CO₂ ratio in urea manufacture results in

Increased degree of conversion of CO₂ to urea

Decreased degree of conversion of NH₃ to urea

Decreased yield of urea

Decreased specific volume of molten mass

✅ The correct answer is option A.

3762. A potassic fertiliser contains 50% K₂O. It could be

Potassium sulphate

Potassium chloride

A mixture of NaCl+ KCl

None of these

✅ The correct answer is option A.

3763. Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

Rate of reaction is very low

Very high pressure is required resulting in costly pressure vessel

Space velocity of gas is very low resulting in decreased conversion

None of these

✅ The correct answer is option A.

3764. 5-10-5 fertilisers mean that they contain

5, 10, 5% respectively of N₂, P₂O₅ and K₂O

Only 5 to 10% active fertiliser constituents

5 to 10% filler & carrier of soil conditioners

None of these

✅ The correct answer is option A.

3765. Heating a mixture of phosphate rock, coke and sand in an electric furnace produces

Phosphoric acid

Ammonium phosphate

Phosphorous

Superphosphate

✅ The correct answer is option C.

3766. __________ is required more for leafy crops.

Nitrogen

Phosphorous

Potassium

Carbon

✅ The correct answer is option A.

3767. Ammonium nitrate (a fertiliser) is coated with limestone powder to

Increase its nitrogen content

Cut down its production cost

Avoid the risk of explosion

Add extra nutrient as fertiliser

✅ The correct answer is option C.

3768. Reaction of calcium fluorapatite with sulphuric acid produces

Ortho-phosphoric acid

Simple superphosphate

Triple superphosphate

Red phosphorous

✅ The correct answer is option B.

3769. P₂O₅ content in triple superphosphate is about __________ percent.

42-50

15-20

85-90

70-75

✅ The correct answer is option A.

3770. Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth?

Nitrogeneous fertiliser

Potassic fertiliser

Phosphatic fertiliser

None of these

✅ The correct answer is option A.