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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.

7641. Which of the following is an undesirable property in a tower packing?

Large surface per unit volume

Large free cross-section

Low weight per unit volume

Large weight of liquid retained

✅ The correct answer is option D.

7642. If ‘n’ is the order of reaction, then unit of rate constant is

1/(time)(concentration)n – 1

(time)-1 (concentration)n – 1

(time)n – 1 (concentration)

None of these

✅ The correct answer is option A.

7643. Leaching of coarse solid lumps is also termed as

Decoction

Dissolution

Percolation

Agitation and settling

✅ The correct answer is option C.

7644. Study of chemical kinetics is the easiest in the case of __________ reactions.

Irreversible

Reversible

Surface

Side

✅ The correct answer is option A.

7645. An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP – 0.125CR. A stream containing only P enters the

0.8

1.33

1.6

2.67

✅ The correct answer is option C.

7646. Which of the following employs an accessory known as ‘drift eliminator’ ?

Multiple effect evaporator

Mechanical draft cooling tower

Rotary dryer

Rotating disc contactor

✅ The correct answer is option B.

7647. If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

✅ The correct answer is option C.

7648. In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Fast reactions in catalyst of small pore diameter

Fast reaction in catalyst of large pore diameter

Slow reactions in catalyst of small pore diameter

Slow reactions in catalyst of large pore diameter

✅ The correct answer is option C.

7649. The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is

0.875

0.5

0.425

Data insufficient to calculate

✅ The correct answer is option A.

7650. For the same residence time, which one will give the maximum conversion?

Single stirred tank (v = 5 litres)

Two stirred tank (each of 2.5 litres) in series

Stirred tank followed by tubular flow reactor (each of 2.5 litres)

Single tubular flow reactor (v = 5 litres)

✅ The correct answer is option D.