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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None of the above Electric heater is used to heat 0.63 liters/minute of water (c. = 4.18 kJ/kg.K density =1000 kg/m ) from 13 °C to 85 C. What is the current (in Amperes) that must be supplied to this heater if the supplied voltage is 220 V? Select one: O a 10.37 Ob. 11.97 Oc. 7.98 Od.14.36 O e. None of he above
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A rigid tank with volume of 1 m contains 2.5 kg of water at 100 C. The tank is now heated. If a safety pressure valve is installed, at what pressure should the valve be set to have a maximum temperature of 250 C? Select one: a. 534.33 Ob. 478.83 C. 592.43 O d. 431.42 O e. None of the above INEXT PAGE
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