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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.

Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?

A Grashoff

B Reynolds

C Both ‘a’ & ‘b’

D Prandtl & Grashoff

Review Detailed Answer

Correct Answer: Grashoff

Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?

A Existence of thermal boundary layer

B Temperature gradient produced due to density difference

C Buoyancy of the bubbles produced at active nucleation site

D None of these

Review Detailed Answer

Correct Answer: None of these

Reason for operating an evaporator in multiple effects is to secure ___________________?

A Increased steam economy

B Decreased steam consumption

C Both A. and B.

D Increased capacity

Review Detailed Answer

Correct Answer: Both A. and B.

All analogy equations connecting friction factor and heat transfer co-efficient apply only to ___________________?

A Wall or skin friction

B Form friction

C Both A. and B.

D Turbulent flow

Review Detailed Answer

Correct Answer: Wall or skin friction

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?

A U1 – U2

B 1/U1 – 1/U2

C 1/U2 – 1/U1

D U2 – U1

Review Detailed Answer

Correct Answer: 1/U1 – 1/U2

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A 1.26 h1

B 0.794 h1

C 0.574 h1

D 1.741 h1

Review Detailed Answer

Correct Answer: 0.794 h1

A graph between _____________ is called Wilson plot?

A (1/U) Vs. (1/v0.8)

B (1/v0.8) Vs. U

C v0.8 Vs . U

D (1/U) Vs. (1/V)

Review Detailed Answer

Correct Answer: (1/U) Vs. (1/v0.8)

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

A 35.5

B 43.75

C 81.25

D 48.25

Review Detailed Answer

Correct Answer: 81.25

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

A Decreases the pressure drop

B Decreases the outlet temperature of cooling medium

C Increases the overall heat transfer coefficient

D None of these

Review Detailed Answer

Correct Answer: Increases the overall heat transfer coefficient

Vent pipes are provided in a condenser to ________________?

A Remove non-condensable gases

B Purge the condenser

C Facilitate easy cleaning of tubes

D None of these

Review Detailed Answer

Correct Answer: Remove non-condensable gases

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

All Topics 9594

All Topics 9594

Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?

Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?

Reason for operating an evaporator in multiple effects is to secure ___________________?

All analogy equations connecting friction factor and heat transfer co-efficient apply only to ___________________?

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A graph between _____________ is called Wilson plot?

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

Vent pipes are provided in a condenser to ________________?