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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.

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?

A 180

B 970

C 3.97

D None of these

Review Detailed Answer

Correct Answer: 180

Baffle spacing ____________________?

A Is not the same as baffle pitch

B Should be less than one fifth the diameter of the shell

C Should be less than the inside diameter of the shell

D None of these

Review Detailed Answer

Correct Answer: Should be less than the inside diameter of the shell

The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?

A ∝ t

B ∝ 1/t

C ∝ √t

D Independent of ‘t’

Review Detailed Answer

Correct Answer: ∝ 1/t

The purpose of floating head in a heat exchanger is to_________________?

A Avoid buckling of tubes

B Provide support for tubes

C Decrease the pressure drop

D Facilitate its lengthening, if needed

Review Detailed Answer

Correct Answer: Avoid buckling of tubes

Mechanical recompression evaporation is used in the production of____________________?

A Alcohol

B Distilled water

C Salt

D Fruits jam

Review Detailed Answer

Correct Answer: Distilled water

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?

A Its evaporation loss

B Excessive corrosion

C Uneconomic LMTD

D Decrease in heat exchanger efficiency

Review Detailed Answer

Correct Answer: Excessive corrosion

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?

A Forced convection

B Natural convection

C Transient conduction

D Steady state conduction

Review Detailed Answer

Correct Answer: Transient conduction

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?

A Cube

B Cylinder

C Sphere

D Equal for all the three

Review Detailed Answer

Correct Answer: Cube

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

A Dittus-Boelter equation

B Sieder-Tate equation

C Nusselt equation

D None of these

Review Detailed Answer

Correct Answer: Sieder-Tate equation

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?

A hf = hd

B hf > hd

C hf < hd

D hf could be greater or smaller than hd

Review Detailed Answer

Correct Answer: hf < hd

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?

Baffle spacing ____________________?

The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?

The purpose of floating head in a heat exchanger is to_________________?

Mechanical recompression evaporation is used in the production of____________________?

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?