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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.

Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?

A 1

B < 1

C > 1

D > 5

Review Detailed Answer

Correct Answer: 1

Double pipe heat exchangers are preferably useful, when____________________?

A High viscosity liquid is to be cooled

B Requirement of heat transfer area is low

C Overall heat transfer co-efficient is very high

D A corrosive liquid is to be heated

Review Detailed Answer

Correct Answer: Requirement of heat transfer area is low

With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?

A Decreases

B Increases

C Increases exponentially

D Remain unaffected

Review Detailed Answer

Correct Answer: Decreases

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

A Decreases

B Increases

C Remains unchanged

D Increases exponentially

Review Detailed Answer

Correct Answer: Decreases

For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?

A d2T/dZ2 > 0

B d2T/dZ2 = 0

C d2T/dZ2 < 0

D dT/dZ = 0

Review Detailed Answer

Correct Answer: d2T/dZ2 = 0

Heat flux through several resistances in series in analogous to the current flowing through several_____________________?

A Resistances in parallel

B Capacitors in series

C Resistances in series

D None of these

Review Detailed Answer

Correct Answer: Resistances in series

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

A 1

B 1

D None of these

Review Detailed Answer

Correct Answer: 1

Heat transfer by natural convection is enhanced in system with__________________?

A High viscosity

B High co-efficient of thermal expansion

C Low temperature gradients

D Low density change with temperature

Review Detailed Answer

Correct Answer: High co-efficient of thermal expansion

Reynold’s analogy states that (where, St = Stanton number f = friction factor) ?

A St = f/2

B St = f/4

C St = 4f

D St = f1/2

Review Detailed Answer

Correct Answer: St = f/2

A dephlegmator is a_____________________?

A Total condenser

B Vacuum evaporator

C Partial condenser

D Double pipe heat exchanger

Review Detailed Answer

Correct Answer: Partial condenser

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?

Double pipe heat exchangers are preferably useful, when____________________?

With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?

Heat flux through several resistances in series in analogous to the current flowing through several_____________________?

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

Heat transfer by natural convection is enhanced in system with__________________?

Reynold’s analogy states that (where, St = Stanton number f = friction factor) ?

A dephlegmator is a_____________________?