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.

7671. A first order reaction requires two equal sized CSTR. The conversion is

Less when they are connected in series

More when they are connected in series

More when they are connected in parallel

Same whether they are connected in series or in parallel

✅ The correct answer is option B.

7672. Reactions with high activation energy are

Very temperature sensitive

Temperature insensitive

Always irreversible

Always reversible

✅ The correct answer is option A.

7673. The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is

8987°K

9210°K

8764°K

8621°K

✅ The correct answer is option B.

7674. For a zero order reaction, the concentration of product increases with the

Increase of reaction time

Increase in initial concentration

Total pressure

Decrease in total pressure

✅ The correct answer is option A.

7675. The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the

Equilibrium constant is infinite

Fractional conversion of

Concentration of

All of the above

✅ The correct answer is option D.

7676. According to the ‘law of mass action’, the rate of reaction is directly proportional to the

Equilibrium constant

Volume of the reaction vessel

Nature of the reactants

Molar concentration of the reactants

✅ The correct answer is option D.

7677. Limiting reactant in a chemical reaction decides the

Rate constant

Conversion

Reaction speed

Equilibrium constant

✅ The correct answer is option B.

7678. If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.

∞

< 0.5

> 0.5

✅ The correct answer is option C.

7679. The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is

1.5

✅ The correct answer is option A.

7680. A space time of 3 hours for a flow reactor means that

The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

Three reactor volumes of feed can be processed every hour

It takes three hours to dump the entire volume of the reactor with feed

Conversion is cent per cent after three hours

✅ The correct answer is option A.