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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A 1.26 h1

B 0.794 h1

C 0.574 h1

D 1.741 h1

Review Detailed Answer

Correct Answer: 0.794 h1

A graph between _____________ is called Wilson plot?

A (1/U) Vs. (1/v0.8)

B (1/v0.8) Vs. U

C v0.8 Vs . U

D (1/U) Vs. (1/V)

Review Detailed Answer

Correct Answer: (1/U) Vs. (1/v0.8)

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

A 35.5

B 43.75

C 81.25

D 48.25

Review Detailed Answer

Correct Answer: 81.25

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

A Decreases the pressure drop

B Decreases the outlet temperature of cooling medium

C Increases the overall heat transfer coefficient

D None of these

Review Detailed Answer

Correct Answer: Increases the overall heat transfer coefficient

Vent pipes are provided in a condenser to ________________?

A Remove non-condensable gases

B Purge the condenser

C Facilitate easy cleaning of tubes

D None of these

Review Detailed Answer

Correct Answer: Remove non-condensable gases

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?

A Lower tube side pressure drop

B Lower shell side pressure drop

C Higher tube side heat transfer co-efficient

D Higher shell side heat transfer co-efficient

Review Detailed Answer

Correct Answer: Higher tube side heat transfer co-efficient

The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?

A Von-Karman

B Reynolds

C Colburn

D Prandtl

Review Detailed Answer

Correct Answer: Prandtl

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

A Scaling

B Highly viscous

C Corrosive

D Salty

Review Detailed Answer

Correct Answer: Highly viscous

When warm and cold liquids are mixed, the heat transfer is mainly by_______________?

A Conduction

B Convection

C Radiation

D Both A. & C.

Review Detailed Answer

Correct Answer: Convection

At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?

A Decrease

B Increase

C Remain unchanged

D May increase or decrease; depends on the pressure

Review Detailed Answer

Correct Answer: Decrease

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A graph between _____________ is called Wilson plot?

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

Vent pipes are provided in a condenser to ________________?

The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?

The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

When warm and cold liquids are mixed, the heat transfer is mainly by_______________?

At constant temperature, the thermal conductivities of gases _____________ with rise in pressure?