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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 cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in_____________________?

A Increased economy

B Decreased economy

C Lower capacity

D No effect on economy

Review Detailed Answer

Correct Answer: Increased economy

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately ?

A 32

B 37

C 45

D 50

Review Detailed Answer

Correct Answer: 32

Graetz number is given by__________________?

A mCp/kL

B kL/mCp

C mCp/kμ

D kμ/mCp

Review Detailed Answer

Correct Answer: mCp/kL

Reynold’s analogy states that_________________?

A Nst α f

B Nst α NRe

C NNu α f

D NRe α f

Review Detailed Answer

Correct Answer: Nst α f

Which of the following has the minimum thermal conductivity ?

A Nitrogen

B Steel

C Carbon black

D Tar

Review Detailed Answer

Correct Answer: Nitrogen

For an ideal black body______________________?

A Absorptivity = 1

B Reflectivity = 1

C Emissivity = 0

D Transmissivity = 1

Review Detailed Answer

Correct Answer: Absorptivity = 1

For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a _______________ evaporator?

A High pressure

B Vacuum

C Backward feed

D None of these

Review Detailed Answer

Correct Answer: Vacuum

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?

A C/E

B E/C

C CE

D 1/CE

Review Detailed Answer

Correct Answer: C/E

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?

A Prandtl number

B Grashoff number

C Thermal conductivity

D Viscosity

Review Detailed Answer

Correct Answer: Prandtl number

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is – 5°C. The outside wall temperature is___________________?

A 25°C

B 30°C

C 35°C

D 40°C

Review Detailed Answer

Correct Answer: 35°C

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in_____________________?

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately ?

Graetz number is given by__________________?

Reynold’s analogy states that_________________?

Which of the following has the minimum thermal conductivity ?

For an ideal black body______________________?

For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a _______________ evaporator?

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is – 5°C. The outside wall temperature is___________________?