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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.

The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ______________ times, when the number of tube passes is increased to 8?

A 20.8

B 40.8

C 40.4

D 20.4

Review Detailed Answer

Correct Answer: 40.8

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred_________________?

A Through a metallic wall

B By direct contact of hot flue gas with air

C By heating an intermediate material (like chequor bricks) and then heating the air from this

D None of these

Review Detailed Answer

Correct Answer: By heating an intermediate material (like chequor bricks) and then heating the air from this

A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?

A 6000

B 24000

C 60000

D 48000

Review Detailed Answer

Correct Answer: 24000

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?

A 1.66

B 88.66

C 3.66

D Dependent on NRe only

Review Detailed Answer

Correct Answer: 3.66

Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?

A Corrosiveness

B Fouling characteristic

C Viscosity

D None of these

Review Detailed Answer

Correct Answer: None of these

What is the absorptivity of a black body?

A 1

B 0

C 0.78

D 0.95

Review Detailed Answer

Correct Answer: 1

Economy of a multiple effect evaporator is not influenced much by the_______________________?

A Boiling point elevations

B Temperature of the feed

C Rate of heat transfer

D Ratio of the weight of the thin liquor to thick liquor

Review Detailed Answer

Correct Answer: Boiling point elevations

Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube___________________?

A Exit-fluid temperature > wall temperature

B Exit fluid temperature < wall temperature

C Exit fluid temperature = wall temperature

D Graetz number > 100

Review Detailed Answer

Correct Answer: Exit fluid temperature = wall temperature

In case of evaporators, liquid entrainment results primarily due to_________________?

A High vacuum in the evaporator

B High evaporation rate

C Foaming of the solution

D High heat transfer rate

Review Detailed Answer

Correct Answer: Foaming of the solution

Heat exchangers operating, when the asymptotic range is reached, ?

A Provide very large heat transfer co-efficient

B Results in making part of the heating surface inactive

C Results in abruptly increased velocity

D None of these

Review Detailed Answer

Correct Answer: Results in making part of the heating surface inactive

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ______________ times, when the number of tube passes is increased to 8?

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred_________________?

A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?

Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?

What is the absorptivity of a black body?

Economy of a multiple effect evaporator is not influenced much by the_______________________?

Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube___________________?

In case of evaporators, liquid entrainment results primarily due to_________________?

Heat exchangers operating, when the asymptotic range is reached, ?