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【Learn Ethylene Together】Five questions per day to easily learn about ethylene. 37 True or False questions: 8. At a certain gas flow rate, the gas has the same rotational speed as the impeller. （）49. As the flow rate in a centrifugal compressor decreases gradually, the heat generated by frictional losses also decreases gradually. ( ) 50. The point on the performance curve of a centrifugal compressor where the slope is zero is the critical point. （）51. The reversible adiabatic compression of the working fluid in the compressor is a isentropic process. （）52. The lower the cooling temperature, the higher the coefficient of performance; however, more compression work is required to provide a unit amount of cooling capacity. ( )53. The reversible heat transfer process involves infinitesimally small temperature differences, whereas in actual processes the temperature differences are not infinitesimal. （）8. At a certain gas flow rate, the gas has the same rotational speed as the impeller. (×) 49. As the flow rate in a centrifugal compressor decreases gradually, the heat generated by frictional losses also decreases gradually. (×) 50. The point on the performance curve of a centrifugal compressor where the slope is zero is the critical point. (√) 51. The reversible adiabatic compression of the working fluid in the compressor is a isentropic process. (√) 52. The lower the cooling temperature, the higher the coefficient of performance; however, more compression work is required to provide a unit amount of cooling capacity. (×) 53. In a reversible heat transfer process, the temperature difference is infinitesimally small, whereas in an actual process the temperature difference is not infinitesimally small. (√)