Basic Chemical Engineering MCQs

Practice Basic Chemical Engineering MCQs with answers and explanations to prepare for exams, interviews, and job tests. Our question bank covers fundamental topics such as units and dimensions, material and energy balances, fluid mechanics, thermodynamics, heat transfer, mass transfer, and chemical process basics. These multiple-choice questions are designed for students, fresh graduates, and competitive exam aspirants preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your core concepts and problem-solving skills with our updated Basic Chemical Engineering MCQs.

411. Multistage compression is necessary for high efficiency,

A. If the ratio of the delivery pressure to the intake pressure exceeds 5:1

B. When large amount of gas is to be compressed

C. When the delivered gas is desired at very high velocity

D. None of these

✅ The correct answer is option A.

412. The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be

A. 3171Pa

B. 3567Pa

C. 1.01 x 10⁵Pa

D. 5000Pa

✅ The correct answer is option B.

413. Wavelength of radiation emitted by a body depends on the __________ of its surface.

A. Temperature

B. Area

C. Nature

D. All of the above

✅ The correct answer is option A.

414. Which of the following pair is correctly matched?

A. Heat transfer: Thermal diffusivity

B. Mass transfer: Diffusion co-efficient

C. Momentum transfer: Kinematic viscosity

D. All of the above

✅ The correct answer is option D.

415. As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

A. 110

B. 85

C. 60

D. 45

✅ The correct answer is option B.

416. Corrosion of metals can not be prevented by its

A. Tempering

B. Chromising

C. Aluminising

D. Alloying

✅ The correct answer is option A.

417. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A. X1.5

B. X0.8

C. X-1.5

D. X-0.8

✅ The correct answer is option B.

418. Current asset of a factory includes the

A. Goodwill of the company

B. Common stocks held by the company

C. Manufacturing plant & equipment

D. Inventory

✅ The correct answer is option C.

419. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same

A. Period increases

B. Period decreases

C. Group increases

D. Both ‘b’ & ‘c’

✅ The correct answer is option D.

420. A dummy activity is used in PERT network to describe the

A. Precedence relationship

B. Resource idleness

C. Resource restriction

D. Necessary time delay

✅ The correct answer is option A.