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Physics Chemistry

Engineering :: Heat Engines

  In a four stage compressor system first and third stage pressures are 1 and 9 kg/cm2 respectively. What will be the fourth stage delivery pressure
[A]. 3 kg/cm2[B]. 9 kg/cm2
[C]. 27 kg/cm2[D]. 81 kg/cm2
[E]. 243 kg/cm2    

Answer: Option D
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