Heat Transfer Operations Mock Test 1

1. Recognize the correct heat transfer rate pattern for critical radius of insulation.

2. Consider we have a 1-2 Shell and Tube Heat Exchanger with tube diameter 20mm and shell diameter 55mm, we have two fluids A&B, A is supply water and B is distilled water, we desire to have their flow rates as 15m³/s and 21m³/s respectively. Which fluid pass arrangement would be best suited for the HE?

3. Which one of the following cannot be determined by knowing fouling factors?

4. Which one of the following figures correctly shows the dotted line at the point of critical radius/ maximum heat transfer rate for a cylindrical tube wall?

5. Nickel alloy based Heat exchangers are used to avoid _____ fouling.

6. The Hydraulic Diameter (D_H) is defined as _____
A_O : is the minimum free-flow area on one fluid side of a heat exchanger.
P : is the wetted perimeter of flow passages of that side.

7. Shell and Tube Heat Exchangers are not commonly used in industries because of their inability to handle high pressure and temperature.

8. Deposition fouling can be avoided or controlled by monitoring the flow velocity of the fluid so that sediments don’t settle out.

9. Which of the following is not a classification based on Construction of the heat Exchanger?

10. The temperature profile of a fully developed Thermal flow in a pipe of length L can be defined by the formula. T_bulk - T_wall = (T_inlet - T_wall)e^λL