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2. The enthalpy change dh of an incompressible substance is given by: (5 pts) a. du + pdv b. du + vdp d. du RdT 3. The temperature of an ideal gas undergoing an adiabatic expansion through a throttling valve (S a. increases c. remains constant b. decreases d. cannot be determined 4. A device which decreases the pressure and increases the velocity is a (5 pts) a. fan c. diffuser b. mixing heat exchanger d. nozzle
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