1. A fluid with Cp = 4 kJ/kg K enters at point 1 at 3 kg/s and 10°C. It exits at point 3 at 15°C. Another fluid with Cp = 2 kJ/kg K enters at point 4 at 90°C and leaves at point 2 at 30°C. What is the flow rate of the second fluid?

2. A Carnot refrigerator operates between 30°C and -5°C. What is its COP?

3. Four states of an ideal Rankine cycle for an unknown fluid are shown in the table below. Calculate the turbine power for a fluid rate of 10 kg/s.

State	T(C)	P (kPa)	H(kJ/kg)	S (kJ/kg K)
1	300	1000	750	10
2	50	10	512	10
3	50	10	75	2
4	50	1000	75	2

4. Fill in the blank. Pressure drops for elements in series are _________________.

5. A fluid with Cp = 4 kJ/kg K enters at point 1 at 3 kg/s and 10°C. It exits at point 3 at 15°C. Another fluid with Cp = 2 kJ/kg K enters at point 4 at 90°C and leaves at point 2 at 30°C. What is the total Q for the system?

6. Combustion of a fuel at 900°K at a rate of 2 kW produces steam at 500°K . The steam then produces 500kW of work and rejects some heat to 300°K. What is the second-law efficiency (or efficiency compared to a Carnot engine) of the process?

7. In considering the exits of two pumps or blowers configured in parallel, which of the following statements is true?

8. A piece of analytical equipment employs very narrow diameter tubing to supply solvent (density = 0.9 g/cm³, viscosity = 0.78 cP) to a workstation at a flow rate of 5 ml/min. The internal diameter of the tubing is 1000
m and the length of the tubing is 75 cm. What is the pressure drop in the tubing?

9. In considering two pumps (1 and 2) connected in series, which of the following is true?

10. The power input for vapor absorption refrigeration systems is best described by which of the following?

11. What is the most efficient thermodynamic cycle for interconverting work and heat commonly called?

12. Four states of an ideal Rankine cycle for an unknown fluid are shown in the table below. Which state corresponds to the turbine inlet conditions?

State	T(C)	P (kPa)	H(kJ/kg)	S (kJ/kg K)
1	300	1000	750	10
2	50	10	512	10
3	50	10	75	2
4	50	1000	75	2

13. A centrifugal pump can provide a flow of 20 L/min at a pressure of 20 psi above atmospheric pressure. What is the minimum pipe diameter (
) that can be used to carry water for 50 m?

14. Air is flowing through a pipe with an internal diameter of 15 cm. It passes through an orifice of diameter 8 cm. The air density at the operating conditions is about 1.3 kg/m³. The observed pressure difference across the orifice is approximately 100 mm Hg, and the flow coefficient for the orifice is approximately 0.7. What is the mass flow rate of air?

15. Water flowing at 10 gallons per minute passes through a contraction from 1 inch internal diameter pipe to a 1/2 inch internal diameter pipe. Use Bernoulli's equation to calculate the pressure difference from immediately before the contraction to immediately after the contraction. This pressure difference is defined as the pressure before the contraction minus the pressure after the contraction.

16. Vapor compression refrigeration systems are most closely associated with which cycle?

17. Important factors for choosing a pipe material include which of the following?

18. A fluid with Cp = 4 kJ/kg K enters at point 1 at 3 kg/s and 10°C. It exits at point 3 at 15°C. Another fluid with Cp = 2 kJ/kg K enters at point 4 at 90°C and leaves at point 2 at 30°C. It is known that the area for heat transfer is 2 square meters. What is the overall heat transfer coefficient in W/m ²K?

19. Air is moved through a conduit at a volumetric rate of 100 m³/min. The conditions are P=18 psi, T = 27°C. What is the mass flow rate of air in the conduit?

20. Fill in the blank. For both pumps and fans, the system resistance varies as the __________________.

21. What is the primary difference between a pump and a blower or fan?

22. For gas flow in a pipe, as the pressure decreases downstream the gas velocity does which of the following?

23. When does cavitation occur?

24. A fluid with Cp = 4 kJ/kg K enters at point 1 at 3 kg/s and 10°C. It exits at point 3 at 15°C. Another fluid with Cp = 2 kJ/kg K enters at point 4 at 90°C and leaves at point 2 at 30°C. If the inlet temperature of the cooling fluid increases to 30°C for a few days, what do you expect the exit temperature of cooled fluid to be during that time?

25. A centrifugal pump can provide flow of 100 L/min at 1.7 atm gauge. What is the minimum pipe diameter (
) that can be used to carry water under these conditions for 100 m?