13. Exergy can be created but cannot be destroyed.Т F14. In gas power cycles, the working fluid changes its phase throughout the cycle.T F15. The ideal Otto cycle consists of a constant volume heat addition process.T F16. The exergy destroyed in an isentropic process is zero.T F17. The working fluid remains in vapor status throughout a vapor power cycle.TF18. Exergy and energy can neither be created nor destroyed.T F

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13. Exergy can be created but cannot be destroyed. т F 14. In gas power cycles, the working fluid changes its phase throughout the cycle. T F 15. The ideal Otto cycle consists of a constant volume heat addition process. T F

13. Exergy can be created but cannot be destroyed. т F 14. In gas power cycles, the working fluid changes its phase throughout the cycle. T F 15. The ideal Otto cycle consists of a constant volume heat addition process. T F

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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In the case of Reheat Rankine cycle I. the work output is always more than simple Rankine cycle. II. the quality of steam at the end of expansion is always less than that of simple Rankine cycle. a. land Il are false O b. Only I is true O c. Only Il is true O d. land Il are true
LAST DIGIT OF ID NUMBER IS 9
Problem 1. Consider a vapor power plant that operates in the Simple Ideal Rankine cycle. Water vapor enters the turbine to 3 MPA and 450 ° C and is condensed in the condenser at a pressure of 15 kPa. Part 1. Diagram T-S indicating the values of the properties. Part 2. Determine: 1) the properties of State 1 (p₁; t₁; v₁; ui; hi; sı). 2) The properties of State 2 (T2; P2; V2; U2; H2; S2). 3) The pump works (wbomba) and the turbine (wurbina). 4) The heats: boiler (QH) and condenser (QL). 5) The thermal efficiency of this cycle.
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As indicated in Fig. P8.52, a power plant similar to that in Fig. 8.11 operates on a regenerative vapor power cycle with one closed feedwater heater. Steam enters the first turbine stage at state 1 where pressure is 12 MPa and temperature is 560 C. Steam expands to state 2 where pressure is 1 MPa and some of the steam is extracted and diverted to the closed feedwater heater. Condensate exits the feedwater heater at state 7 as saturated liquid at a pressure of 1 MPa, undergoes a throttling process through a trap to a pressure of 6 kPa at state 8, and then enters the condenser. The remaining steam expands through the second turbine stage to a pressure of 6 kPa at state 3 and then enters the condenser. Saturated liquid feedwater exiting the condenser at state 4 at a pressureof 6 kPa enters a pump and exits the pump at a pressure of 12 MPa. The feedwater then flows through the closed feedwater heater, exiting at state 6 with a pressure of 12 MPa. The net power output for the cycle is 330…
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