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4. If the cold fluid heat capacity for the above heat exchanger is 1kJ/kgK, what is its flow rate in kg/s ? a. 66g/s b. 6.6kg/s c. 66kg/mint d. 660kg/s e. 66kg/s 5. A heat exchanger operates with the following temperatures: cold fluid inlet 15C, cold fluid outlet 25C, hot fluid inlet 90C, and hot fluid outlet 30C. Calculate the logarithmic-mean temperature difference in C. a. 45 b. 30 c. 26 d. 25 e. 50 6. During a house fire, the smoke and flames rise up, but the air down near the floor is cooler and less smoky. This is an example of a. Convection b. Conduction c. Radiation d. Non of above 7. In order for a system to be in thermal equilibrium, which of the following properties must the same throughout the system? a. Mass b. Pressure c. Temperature d. Volume