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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.

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the________________?

A Surrounding temperature

B Average temperature of the fin

C Temperature of the fin end

D Constant temperature equal to that of the base

Review Detailed Answer

Correct Answer: Constant temperature equal to that of the base

The actual temperature drop across the heating surface in an evaporator depends on the_________________?

A Feed

B Depth of liquid over heating surface

C Pressure difference between steam chest and vapour space

D All A., B. and C.

Review Detailed Answer

Correct Answer: All A., B. and C.

Heat flux is the time rate of heat transfer per unit_______________?

A Length

B Area

C Volume

D None of these

Review Detailed Answer

Correct Answer: Area

The steam ejector is used to__________________?

A Remove condensate from the steam pipelines

B Create vacuum

C Superheat the steam

D None of these

Review Detailed Answer

Correct Answer: Create vacuum

Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?

A Vertical heat exchanger with steam on tube side

B Vertical heat exchanger with steam on shell side

C Horizontal heat exchanger with steam on tube side

D Horizontal heat exchanger with steam on shell side

Review Detailed Answer

Correct Answer: Vertical heat exchanger with steam on shell side

Which of the following is generally considered as opaque surface towards radiations ?

A Gases

B Solids

C Liquids

D Both B. and C.

Review Detailed Answer

Correct Answer: Both B. and C.

Fourier’s law of heat conduction applies to _____________ surfaces?

A Isothermal

B Non-isothermal

C Both A. and B.

D Neither A. and B.

Review Detailed Answer

Correct Answer: Both A. and B.

200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?

A 0.5

B 0.05

C 0.1

D 0.15

Review Detailed Answer

Correct Answer: 0.1

Harmonic mean temperature difference is given by_________________?

A √(ΔT1 . ΔT2)

B 2 (ΔT1 . ΔT2)/(ΔT1 + ΔT2)

C 2 (ΔT1 . ΔT2)/(ΔT1 – ΔT2)

D (ΔT1 – ΔT2)/(ΔT1 . ΔT2)

Review Detailed Answer

Correct Answer: 2 (ΔT1 . ΔT2)/(ΔT1 + ΔT2)

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?

A ha = hl

B ha = 2hl

C ha = 0.5 hl

D ha = 0.75 hl

Review Detailed Answer

Correct Answer: ha = 2hl

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the________________?

The actual temperature drop across the heating surface in an evaporator depends on the_________________?

Heat flux is the time rate of heat transfer per unit_______________?

The steam ejector is used to__________________?

Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?

Which of the following is generally considered as opaque surface towards radiations ?

Fourier’s law of heat conduction applies to _____________ surfaces?

Harmonic mean temperature difference is given by_________________?

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?