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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.

6401. Cavitation occurs in a centrifugal pump when the suction pressure is

Less than the vapour pressure of the liquid at that temperature

Greater than the vapour pressure of the liquid at that temperature

Equal to the vapour pressure

Equal to the developed head

✅ The correct answer is option A.

6402. Drag co-efficient in hindered settling is __________ that in free settling.

Less than

Equal to

Not necessarily greater than

Always greater than

✅ The correct answer is option D.

6403. Fanning friction factor equation applies to the __________ fluid flow.

Non-isothermal condition of

Compressible

Both A and B

Neither A nor B

✅ The correct answer is option D.

6404. The head loss due to sudden contraction is proportional to

Velocity

Velocity head

Turbulence

None of these

✅ The correct answer is option B.

6405. Momentum correction factor used in fluid flow problems accounts for the

Change in direction of flow

Change in total energy

Change in pressure

Non uniform direction of velocities at inlet & outlet sections

✅ The correct answer is option D.

6406. Euler’s equation of motion states, that at every point, the

Fluid momentum is constant

Force per unit mass equals acceleration

Rate of mass outflow is equal to the rate of mass inflow

None of these

✅ The correct answer is option B.

6407. Power number is the ratio of

Drag stress to inertial stress

Inertial stress to drag stress

Inertial stress to gravitational stress

Gravitational stress to drag stress

✅ The correct answer is option A.

6408. The percentage slip in a reciprocating pump set is given by the % of (where, Q₁ = actual discharge Q₂ = theoretical discharge)

Q₁/Q₂

Q₂/Q₁

(Q₂ – Q₁)/Q₁

(Q₂ – Q₁)/Q₂

✅ The correct answer is option D.

6409. The value of critical Reynolds number for pipe flow is

1300

10,000

100,000

None of these

✅ The correct answer is option A.

6410. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.

500

1000

✅ The correct answer is option B.