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.

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6231. Pick out the correct statement pertaining to venturimeter.

A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward

The co-efficient of contraction of a venturimeter is always unity

For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected

None of these

✅ The correct answer is option D.

6232. Multistage centrifugal pumps are generally used for

High head

Low head but high discharge

Highly viscous liquid

Slurries of high solid concentration

✅ The correct answer is option A.

6233. Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)

Df + Bf = Wf

Df = Bf + Wf

Df + Bf + Wf =0

None of these

✅ The correct answer is option A.

6234. In case of venturimeters, friction losses are about __________ percent of maximum velocity head.

2

8

12

20

✅ The correct answer is option A.

6235. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).

1/D

1/D²

1/D⁵

D²

✅ The correct answer is option C.

6236. The fluid jet discharging from a 2″ diameter orifice has a diameter of 1.75″ at its vena-contracta. The co-efficient of contraction is

1.3

0.766

0.87

None of these

✅ The correct answer is option B.

6237. Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone.

1

10

40

70

✅ The correct answer is option B.

6238. The __________ is measured by a piezometric opening.

Dynamic pressure

Static pressure

Total pressure

Point velocity

✅ The correct answer is option C.

6239. In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)

Vavg

1.2 Vavg

1.5 Vavg

1.8 Vavg

✅ The correct answer is option B.

6240. What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?

0.5

0.67

1

2

✅ The correct answer is option D.