1. In order to achieve the highest possible efficiency for a power cycle, what should be the value of the working fluid's critical temperature? A. As low as can be B. As high as can be C. The critical temperature has no effect on the efficiency D. None of the items mentioned 2. What is the disadvantage of using steam as the working fluid for power cycles? A. Since the critical temperature of water is high, it requires high superheating. B. Small value for QH C. Reheating is needed, and that entails additional cost. D. All of the items mentioned 3. When the feedwater in a rankine cycle is closed, A. Heat transfer capacity is large. B. A pump is needed to handle the increase in the feedwater stream. C. Only one pump is needed even if there is an increase in the feedwater stream. D. No pump is needed since mixing in the heater does not occur anyway. 4. This is a type of feedwater heater where the steam taken from the turbine and the feedwater from the condenser exchange heat with each other but are not allowed to mix. A. Open type feedwater heater B. Contact type feedwater heater C. Closed type feedwater heater D. None of the items mentioned

1. In order to achieve the highest possible efficiency for a power cycle, what should be the value of the working fluid's critical temperature? A. As low as can be B. As high as can be C. The critical temperature has no effect on the efficiency D. None of the items mentioned 2. What is the disadvantage of using steam as the working fluid for power cycles? A. Since the critical temperature of water is high, it requires high superheating. B. Small value for QH C. Reheating is needed, and that entails additional cost. D. All of the items mentioned 3. When the feedwater in a rankine cycle is closed, A. Heat transfer capacity is large. B. A pump is needed to handle the increase in the feedwater stream. C. Only one pump is needed even if there is an increase in the feedwater stream. D. No pump is needed since mixing in the heater does not occur anyway. 4. This is a type of feedwater heater where the steam taken from the turbine and the feedwater from the condenser exchange heat with each other but are not allowed to mix. A. Open type feedwater heater B. Contact type feedwater heater C. Closed type feedwater heater D. None of the items mentioned

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A steam powerplant currently operates between a boiler pressure, 110 bar, and a condenser pressure, 0.045. Calculate the cycle efficiency, the work ratio and the specific steam consumption for a ranking cycle with dry saturated at the entry of the turbine. (Ranking cycle, Not superheated and T3 = 250 degrees Celsius)
note: all feed water heater used in the cycle is open
100 20. 150 200 250 300 350 400 450 500 550 600 650 QU PONTHFC-134a 700 200. 10. 8. 0.0012 0.0013 0.0014 0,0016 0.0018 Pressure-Enthalpy 0.0020 0.0030 Diagram 100. 80. 6. volume = 0.0040 m³ikg (SI Units) 4. 0.0060 60. 0.0080 0.010 40. 2. 0.015 0.020 20. 50 1. 0.030 0.8 - 0.040 10. 8. 0.6 0.060 0.4 6. 0.080 0.10 - temperature = 0°C 0.2 0.15 0.20 2. 0.1 0.08 0.30 0.40 0.06 1. 0.8 0.60 0.04 0.6 0.80 1.0 0.4 0.02 1.5 2.0 0.2 0.01 100 150 200 250 300 350 400 450 0.1 700 500 550 600 650 Enthalpy (kJ/kg) Pressure (MPa) 0.65 0.70 0.75 0.80 0.85 09- os 00070 -40 temperature = -20°C 06'0 0.95 Dinby pa 10- 00'L 0- 1.05 1.10 1.15 1.20 1.25. 8 1.30 10 0.00080 quality 0.4 1.35 06000 o 0.0010 OD' OS' 1.55 09 6'0. 09 i 70 06 101 120 N 140 091 170 061 210 220 °C 230 temperature 4. Pressure (bar)
Step 3 Determine the thermal efficiency of the cycle. n = Save for Later % Attempts: 0 of 4 used Submit Answer
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