1) An ideal gas flows through a throttle whose inlet pipe diameter is the same a

Question

1) An ideal gas flows through a throttle whose inlet pipe diameter is the same as the exit pipe diameter and the pressure drops. Will the velocity: a) increase b) stay the same c) decrease 2) Why don?t we include kinetic energy changes when analyzing throttling processes9 a) because there cannot be kinetic energy changes going through a throttle b) because the kinetic energy changes are small and can be neglected c) because the kinetic energy is zero 3) A saturated vapor stream is mixed with a saturated liquid stream in an insulated steady-flow mixing chamber at constant pressure. The exit from the mixing chamber will be a) compressed liquid b) a saturated liquid c) a saturated liquid-vapour mixture d) a saturated vapour e) a superheated vapour

Explanation / Answer

a) Throttling process is best rresented as a process occuring at constant enthlpy.

There is not appreciable change in kinetic energy. Hence, there is no change in velocity. Hecne,

Correct answer is (b)

b) During throttling process, there will not be significant change in kinetic enertgy. Hence, correct answer

is (b).

c) When a saturated liqudi stream is mixed with saturated vapor stream at the same pressure, the resulting stream will be mixtue of vapor and liqudi mixture. Hence, corrected answer is (c).

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