When using a two-phase, three-wire system, the size of the neutral conductor must be increased by the square root of ____.
A. 2
B. 3
C. 5
D. 6
Answer: A
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Oxygen at T=400 K and P=2 atm flows into an adiabatic, reversible nozzle operating at steady-state. The stream has a negligible velocity as it enters the nozzle but is ejected at a high velocity. The exiting oxygen is at P=0.5 atm. You may assume that oxygen is an ideal gas with constant Cp*=(7/2)R. On a mass basis, this is equivalent to CP = 0.909 kJ/kg-K.
A) Find the change in entropy of the universe resulting from this process. B) Find the temperature and velocity of the oxygen leaving the nozzle. C) Find ?U for the oxygen in J/mol.
How do you position a reversing valve when replacing it?
A) Place the reversing valve higher than the pilot valve. B) Place the reversing valve level with the pilot valve. C) Place the reversing valve with the main piston in a vertical position. D) Place the reversing valve with the main piston in a horizontal position.
In series heat-reclaim systems, what happens to the heat from the refrigerant in the compressor discharge line?
A) It is used to preheat the air for the store's HVACR system. B) It flows directly to the condenser. C) It is used to cool the air in the store's HVACR system. D) It flows to the heat-reclaim coil and condenser.
Use mesh analysis to find the currents through every branch in Figure P3.33.
