For a throttle valve, generally the following statement is absolutely invalid. N

Question

For a throttle valve, generally the following statement is absolutely invalid. None of the above For a mixing chamber, the following statement is valid. There is no mass transfer between the mixing chamber and the surrounding There is no energy transfer between two moving fluids inside a mixing chamber. Bothe energy transfer and mass transfer occur between two moving fluids inside a mixing chamber There must be mechanical or electric work input to the mixing chamber in order to accomplish the energy exchange between two moving fluids inside a mixing chamber Steam flows through a pipe with an inner diameter of 25 cm at a flow rate of 0.10 kg/s at a pressure of 200 kPa and temperature of 400 degree C to exit to the air. The rate of energy that leave the pipe by the steam is 504.71 kJ/s 327.70 kJ/s 307.21 kJ/s 280.88 kJ/s None of the above Cp is larger than Cv for an ideal gas Always Sometimes Never Only true if it is a constant-volume process In a steady- flow control volume device, the fluid properties may change with location over the cross section of the inlets or exits. Always Never Sometimes Only true if it is a constant-volume process kPa . m3 is equivalent to kN

Explanation / Answer

(1a.) -A (since throttle is an isenthalpic process)

(1b.)-A

(1c.)- (at the given point h=3487.1, so rate of energy=m*h=0.1*3487.1=348.71 kJ/s)

(1d.)-A

(1e.)-B

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