1/13/23, 2:09 PM Question 10 Not yet answered Marked out of 5 MENG420L-Fall 2022-2023 Final Exam slot 1 The hot efficiency through a Concentric Tube Heat Exchanger is equal to m (g/s) Cp (kJ/kg.K) Thot (°C) cold hot cold hot T1 T₂ 30 15 4.17915 4.1855 59 48 Select one: O a. 69.4% O b. 22.2% ○ c. 30.5 % O d. 13.8 % Question 11 Not yet answered Marked out of 5 In the forced convection experiment, and according to the graph below: 100 80 60 50 40 30 20 0 2 7 AIR VELOCITY (M/SEC) Select one: Oa. As the heat input remains constant the surface temperature falls with increasing air velocity. Ob. As the heat input increases the surface temperature falls with decreasing air velocity. Oc. As the heat input increases the surface temperature remains constant with decreasing air velocity. Od. As the heat input remains constant the surface temperature falls with decreasing air velocity.

1/13/23, 2:09 PM Question 10 Not yet answered Marked out of 5 MENG420L-Fall 2022-2023 Final Exam slot 1 The hot efficiency through a Concentric Tube Heat Exchanger is equal to m (g/s) Cp (kJ/kg.K) Thot (°C) cold hot cold hot T1 T₂ 30 15 4.17915 4.1855 59 48 Select one: O a. 69.4% O b. 22.2% ○ c. 30.5 % O d. 13.8 % Question 11 Not yet answered Marked out of 5 In the forced convection experiment, and according to the graph below: 100 80 60 50 40 30 20 0 2 7 AIR VELOCITY (M/SEC) Select one: Oa. As the heat input remains constant the surface temperature falls with increasing air velocity. Ob. As the heat input increases the surface temperature falls with decreasing air velocity. Oc. As the heat input increases the surface temperature remains constant with decreasing air velocity. Od. As the heat input remains constant the surface temperature falls with decreasing air velocity.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

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