Tc The thermal efficiency expression given by Eq. 5.9,1.max = 1 - TH applies for the 0 Carnot, dual, and ideal Brayton cycles. Carnot, Ericsson, and Stirling cycles. Carnot cycle only. Carnot, Otto, and Diesel cycles. The combined-cycle district heating plant shown in Fig. 9.23 has an input of energy by heat transfer and three valuable products: W gas , W vap, and steam for district heating. A thermodynamic efficiency for the plant is best expressed on depending on specific information about the performance of the individual plant components. an energy or exergy basis an energy basis an exergy basis Combustor Gas turbine Compressor Turbine zas Air inlet Exhaust M Heat-recovery steam generator Turbine Wap Vapor cycle Pump Condenser WI Steam Condensate From inspection of Eq. 9.36b, c = V-C). , in which phase of a substance do you expect the velocity of sound to be greatest: gas, liquid, or solid? solid liquid ook and Media gas Once a converging nozzle chokes, further decreases in the back pressure have no effect on the operation of the nozzle. True False For all conditions represented in Table 9.3 across a normal shock, the stagnation temperature downstream of the shock is the stagnation temperature upstream of the shock. equal to less than nd Media greater than Can a normal shock occur in a subsonic diffuser? Yes No tbook and Media Referring to the nozzle in Example 9.14, if the back pressure were 843 kPa, the exit pressure would be 1000 kPa. 843 kPa. 528 kPa. If a normal shock sits in the diverging section of a converging-diverging nozzle, is the flow choked? No Yes tbook and Media