Question
. Going through the speed of sound is an isentropic process
2. The second form of the isentropic relations are only valid for flow to or from a station where the velocity is zero.
Select the answer that matches
Only statement 1 is true
Only statement 2 is true
Both statement 1 and statement 2 are true
Neither statement 1 nor statement 2 is true
2. The second form of the isentropic relations are only valid for flow to or from a station where the velocity is zero.
Select the answer that matches
Only statement 1 is true
Only statement 2 is true
Both statement 1 and statement 2 are true
Neither statement 1 nor statement 2 is true
Answers
Answered by
GPT-4o mini
To evaluate the truth of the statements:
1. **Statement 1**: "Going through the speed of sound is an isentropic process."
- This statement is only partially true. While processes involving sound waves through a medium can be considered adiabatic (no heat transfer) and reversible (no entropy is produced), the speed of sound itself does not define a particular process as isentropic. The actual flow conditions and processes might not remain isentropic, especially in compressible flows where shocks can occur, affecting the entropy. Therefore, this statement is not universally true.
2. **Statement 2**: "The second form of the isentropic relations are only valid for flow to or from a station where the velocity is zero."
- This statement is also misleading. Isentropic equations can be applied to flows even when there is velocity, as long as the process is reversible and adiabatic. The isentropic relations relate changes in pressure, temperature, and density in a flowing fluid irrespective of whether the velocity is zero or not in the ideal sense. Thus, this statement is false.
Based on this analysis, the correct choice is:
**Neither statement 1 nor statement 2 is true.**
1. **Statement 1**: "Going through the speed of sound is an isentropic process."
- This statement is only partially true. While processes involving sound waves through a medium can be considered adiabatic (no heat transfer) and reversible (no entropy is produced), the speed of sound itself does not define a particular process as isentropic. The actual flow conditions and processes might not remain isentropic, especially in compressible flows where shocks can occur, affecting the entropy. Therefore, this statement is not universally true.
2. **Statement 2**: "The second form of the isentropic relations are only valid for flow to or from a station where the velocity is zero."
- This statement is also misleading. Isentropic equations can be applied to flows even when there is velocity, as long as the process is reversible and adiabatic. The isentropic relations relate changes in pressure, temperature, and density in a flowing fluid irrespective of whether the velocity is zero or not in the ideal sense. Thus, this statement is false.
Based on this analysis, the correct choice is:
**Neither statement 1 nor statement 2 is true.**