Каков КПД идеальной тепловой машины, если температура холодильника равна одной четвёртой части температуры нагревателя (%)?

  1. 25
  2. 30
  3. 75
  4. 54

📝 Detailed explanation

T₂ = T₁/4. η = 1 − T₂/T₁ = 1 − 1/4 = 3/4 = 75%.
9 / 15 (60%)
Question 9 of 15
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