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Evaluation Input Image

Refrigerant-134a is expanded adiabatically from 100 psia and 100°F to a saturated vapor at 10 psia. Determine the entropy generation for this process, in Btu/lbm⋅R.<image 1>



(A) 0.00147Btulbm\cdotR0.00147\frac{Btu}{lbm\cdotR}


(B) 0.00047Btulbm\cdotR0.00047\frac{Btu}{lbm\cdotR}


(C) 0.00247Btulbm\cdotR0.00247\frac{Btu}{lbm\cdotR}


Answer with the option's letter from the given choices directly. No punctuation.


Google: Gemini Pro Vision 1.0
mmmu / Energy_and_PowerPublic

A


Expected Answer: B

Difficulty: Medium

Subfield: Thermodynamics

Evaluation

Evaluation ID
c6b74ae3-d983-42a9-af98-37f0bf35fa07
Created
February 21, 2024
Raw Output
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  "model": "google/gemini-pro-vision",
  "choices": [
    {
      "message": {
        "role": "assistant",
        "content": " A"
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      "finish_reason": "STOP"
    }
  ],
  "object": "chat.completion",
  "created": 1708556656,
  "usage": {
    "prompt_tokens": 1608,
    "completion_tokens": 4,
    "total_tokens": 1612
  }
}