Chemical Heat Transfer Mcqs

1.

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

Answer & Solution Discuss in Board

2.

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

Answer & Solution Discuss in Board

3.

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)

Answer & Solution Discuss in Board

4.

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

Answer & Solution Discuss in Board

5.

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

Answer & Solution Discuss in Board

6.

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

Answer & Solution Discuss in Board

7.

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

Answer & Solution Discuss in Board

8.

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

Answer & Solution Discuss in Board

9.

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

Answer & Solution Discuss in Board

10.

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?

A. Equal to

B. More than

C. Less than

D. Either more or less than (depending upon the fluid)

Answer & Solution Discuss in Board

Practice MCQ Questions and answers on Chemical Heat Transfer Mcqs

1. 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__________________?

Answer & Solution

Answer & Solution

3. A graph between _____________ is called Wilson plot?

Answer & Solution

4. 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________________?

Answer & Solution

5. 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) ?

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

10. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?

Answer & Solution

Read More Section(Chemical Engineering Mcqs)

1.

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__________________?

3.

A graph between _____________ is called Wilson plot?

4.

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________________?

5.

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) ?

6.

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

7.

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

8.

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

9.

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

10.

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?