The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer: Option A
Solution(By Examveda Team)
In a Brayton cycle without regeneration, the ideal efficiency increases with an increase in pressure ratio.The efficiency of a Brayton cycle without regeneration is given by:
η = 1 - (1/rk-1)
where η is the cycle efficiency, r is the pressure ratio (pmax/pmin), and k is the specific heat ratio.
As the pressure ratio increases, the denominator term (1/rk-1) decreases, resulting in a higher efficiency.
Therefore, the correct option is Increase.
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