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Question
Harmonic mean temperature difference is given by
Options:
A .  √(ΔT₁ . ΔT₂)
B .  2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
C .  2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
D .  (ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
Answer: Option B
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