Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2. Then the outcoming steam will be_________________?
Correct answer: C. Superheated
- A. Wet
- B. Saturated
- C. Superheated
- D. None of these
Explanation
A throttling valve is isenthalpic, so the steam retains the enthalpy of dry saturated steam at 25 kg/cm². At the lower pressure of 5 kg/cm², this enthalpy is above the saturated-vapour value, making the outlet superheated.
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