1. The thermal efficiency of a Rankine power cycle may beimproved by i. Superheating the steam ii. Reheating the steambetween high and lower pressure sections of the turbine iii.Regenerative Feedwater Heating iv. Insulating the turbine anddecreasing the entropy production during the expansion process v.Incorporating a Rankine cycle power system as part of acogeneration system a. Items i), ii), and iv) only b. Items i),iii), and v) only c. Items ii), iv) and v) only d. All of these e.None of these

2. The back work ratio is … a. The ratio of the compressor outletto inlet pressure in a vapor compression power system. b. The ratioof the pump work (power) input divided by the turbine work (power)output in a Rankine cycle power system. c. The ratio of the inletpressure to the outlet pressure in a steam turbine. d. The ratio ofthe inlet pressure to the outlet pressure in the feedwater pumpsystem of a Rankine cycle power system.

3. For the Rankine cycle process where steam expands through theturbine, in a realistic process, the entropy at the exit is … a.Greater than the entropy at the inlet. b. Equal to the entropy atthe inlet. c. Less than the entropy at the inlet. d. Has norelationship to the entropy at the inlet.   e. None ofthese answers is correct.

4. Regenerative feedwater heaters may be … a. Devices where naturalgas is used to heat feedwater to prevent freezing under coldconditions.   b. Open devices where the steam and thewater being heated are at the same pressure, c. Closed deviceswhere the steam and the water being heated may be at differentpressures and do not mix, d. Open or closed devices, where bothhave their advantages and applications. e. Devices where steam isdiverted, passed back into the steam generator, and then sent backinto the turbine.   f. None of the above.

5. With regenerative feedwater heating, a powerplant will not havemore than one stage of feedwater pump (i.e., each feedwater pumpwill take in water at condenser pressure and deliver water at steamgenerator/turbine inlet pressure). a. True b. False

6. In a power plant, the heat rejected from the condenser … a. Isnot a significant amount of heat, is rejected into thesurroundings, and is not a concern.   b. Is a significantamount of heat and is captured to turn the mainturbine.   c. Is a significant amount of heat, isrejected into the surroundings, and can change the localenvironment. d. Heat is not rejected in the condenser.

7. Deaeration is needed in systems using water as a working fluidto remove air from the water and to minimize corrosion.  a. True b. False

8. A closed feedwater heater may be used for deaeration. a. True b.False
9. In a reciprocating power system,   i. Material flowsat a constant rate through the device and passes through a turbineto produce shaft power output, ii. Material does not flow at aconstant rate through every section of the device.   iii.Power is produced at all times. iv. Power is produced only duringpart of the cycle in each section of the device and is not produceduniformly at every instant.   v. The power unit consistsof one or more piston and cylinder sections with intake and exhaustvalves and where fresh fuel and air are taken in during one part ofthe process, exhaust gases are ejected during another part of theprocess, and at other times the cylinder is closed off from theintake and exhaust sections (manifolds).   vi. The powerunit consists of a compressor, a burner section, and aturbine.   a. Items i), iii), and vi) are correct. b.Items ii) and iii) are correct. c. Items ii), iv) and v) arecorrect. d. Items ii), iv), and vi) are correct. e. None of thesecombinations are correct.

10. The Otto cycle model is used with … a. Reciprocating internalcombustion engines where the fuel-air mixture is ignited by aspark. b. Reciprocating internal combustion engines where thefuel-air mixture is ignited by high pressures in the cylinders. c.Internal combustion engines with continuous flow of fuel and air(i.e., gas turbine engines). d. External combustion “hot air”engines. e. Vapor compression refrigeration.

11. In an air standard analysis, we pretend that the substance inan engine is pure air, and we analyze this as if energy is put intothe air from the outside and, later, waste heat is removed from theair. a. True b. False