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fereviewthermo - 1 The enthalpy of refrigerant RFC-134a is...

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Unformatted text preview: - 1. The enthalpy of refrigerant RFC-134a is reduced from 440 kJ/kg at 0.8 MP3 to 300 kJ/kg in a water- cooled condenser. W hat is the approximate final quality of the refrigerant? A: 32% m (C) 63% (D) 71% 2. Which property of state is not; an extensive state? ( A) temperature (B volume ‘ (C) number of molecuies (D) mass 3. Steam enters an adiabatic nozzle at 1 MPa, 25090, and 30 m/s. At. one point in the nozzle the enthalpy has dropped 40 kJ/kg from its iniet value. Determine the velocity at that. point. (A) 31 m/s -B 110 m 5 ’0 2501115 “1‘. 281111125 4. What cycie or process does the temperature-entropj diagram represent? 8 v Rankine cycle with superheated steam (B) Carnot cyc e (C) diesel cycle (D) refrigeration cycle 5. A Rankine cycle operates between the pressure Iim- Ets of 600 kPa and 10 kPa. For saturated liquid water eaving the condenser and a. turbine inlet temperature of 300°C, determine the thermal efficiency of the cycle A 1397 b (C) 37% (D‘I 52% 0. Atmospheric air at WC has a. relative humidity of 50%. What is the dew-point temperature? (A) 7°C B 1'“ (m (D) 24°C 7. How can the relative humidity of an air sample be determined? (A) Measure the wet-bulb and dry-bulb tempera:- tures and divide the wet—bulb temperature by the dry-bulb temperature. (B) Measure the barometric pressure and look up the corresponding relative humidity on a psy- chrometric chart. C) Measure the wet-bulb and dry-bulb tempera- tures and look up the corresponding relative umidity on a psyehrome ' chart. (D) Measure the wet—bulb and dry—bulb tempera- tures and look up the corresponding relative humidity on a Mollier chart. 8. One method of removing moisture from air is to cool the air so that the moisture condenses or freezer out. To what temperature must air at 100 etm be cooled at constant pressure in order to obtain a humidity ratio of 0.0001? (A) —-6°C (B) 2°C C ° 9. Which of the following statements is true if atmo- spheric air with relative humidity of 50% is heated from 10°C to 25°C at constant volume? (A) The dew point of the air is lowered. (B The dew point of the air ' t ch ed. The relative humi ' ‘ ‘ ' It allows tile reaction to ocché—toichiomet cally. (B) It reduces air pollution. (C) It redum the heat requirements. (1')) It allaws complete combustion. ...
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