GATE AG 2008 • Q41 MCQ • 2 Marks

Section 7: Dairy and Food Engineering

Heat and Mass Transfer

Subtopic: Steady state heat transfer in conduction, convection and radiation

Question Statement:

The thermal conductivity of a common metal used in fabrication of food processing equipment is given as 120 BTU ft⁻¹ h⁻¹ °F⁻¹. This value in J m⁻¹ s⁻¹ K⁻¹ will be

Options:

  • (A) 2.08
  • (B) 20.8
  • (C) 208
  • (D) 280

Official Answer Key:

C

Step-by-Step Solution & Explanation

1 BTU ft⁻¹h⁻¹°F⁻¹ = 1.7307 W m⁻¹K⁻¹ (standard unit conversion). 120 × 1.7307 ≈ 207.7 ≈ 208 W/(m·K) = J/(m·s·K).

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