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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 evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?

A Forward

B Backward

C Parallel

D None of these

Review Detailed Answer

Correct Answer: Backward

1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be__________________?

A 15 min

B 22 min

C 44 min

D 51 min

Review Detailed Answer

Correct Answer: 51 min

Heat waves_____________________?

A Cannot pass through vacuum

B Travel in straight line

C Can be reflected by a mirror

D Both B. and C.

Review Detailed Answer

Correct Answer: Both B. and C.

If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?

A Increase

B Decrease

C Not affect

D Increase the condensing film co-efficient as well as

Review Detailed Answer

Correct Answer: Decrease

For a perfectly transparent surface (like gases), the____________________?

A Absorptivity = 0

B Transmissivity = 1

C Reflectivity = 0

D All A., B. & C.

Review Detailed Answer

Correct Answer: Transmissivity = 1

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?

A d0.8

B d-0.2

C d-1

D d-1.8

Review Detailed Answer

Correct Answer: d-0.2

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?

A 4000

D > 10000

Review Detailed Answer

Correct Answer: > 10000

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

A Peclet

B Prandtl

C Stanton

D Nusselt

Review Detailed Answer

Correct Answer: Prandtl

Vibrations in the tubes of a shell and tube heat exchanger is induced due to the _________________?

A Flow of fluid on the tube and shell sides

B Oscillations in the flow of shell/tube sides fluid

C Vibrations transmitted through piping and/or supports due to external reasons

D All A., B. and C.

Review Detailed Answer

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

What is the steam economy in case of a single effect evaporator system ?

A 1

B > 1

C < 1

D 0.1

Review Detailed Answer

Correct Answer: 1

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?

Heat waves_____________________?

If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?

For a perfectly transparent surface (like gases), the____________________?

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

Vibrations in the tubes of a shell and tube heat exchanger is induced due to the _________________?

What is the steam economy in case of a single effect evaporator system ?