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GATE ME Heat Transfer — practice by topic

Browse 7 questions across 3 Heat Transfer topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Heat Transfer topics

Conduction (7)Convection (7)Radiation (7)

Try a Heat Transfer question

Heat transfer is defined as:Read the answer and worked solution →The THREE modes of heat transfer are:Read the answer and worked solution →Fourier's law of heat conduction (1D) states:Read the answer and worked solution →Net radiation between a small surface at T_s and a much larger surrounding at T_sur is approximately:Read the answer and worked solution →

Worked practice questions

Heat transfer is defined as:

  1. Energy stored in a body
  2. Energy IN TRANSIT due to a TEMPERATURE DIFFERENCE
  3. Work done by a force
  4. Internal energy change
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Correct answer: B. Energy IN TRANSIT due to a TEMPERATURE DIFFERENCE

Heat transfer = energy transit driven by temperature gradient. Thermodynamics tells WHAT happens (δQ, δW, final state) heat transfer tells HOW (mechanism) and AT WHAT RATE.

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The THREE modes of heat transfer are:

  1. Diffusion, advection, dispersion
  2. Conduction, Convection, Radiation
  3. Latent, sensible, total
  4. Forced, free, mixed
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Correct answer: B. Conduction, Convection, Radiation

**Three fundamental modes:** (1) Conduction — molecular diffusion through matter, no bulk motion. (2) Convection — bulk fluid motion carries heat. (3) Radiation — electromagnetic waves, no medium needed.

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Fourier's law of heat conduction (1D) states:

  1. $q = kAT$
  2. $q = -kA\frac{dT}{dx}$ — heat flow rate is proportional to negative of temperature gradient times area
  3. $q = h(T_s - T_\infty)$
  4. $q = \sigma T^4$
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Correct answer: B. $q = -kA\frac{dT}{dx}$ — heat flow rate is proportional to negative of temperature gradient times area

**Fourier's law:** q = −kA·dT/dx. The negative sign means heat flows from hot to cold (down the gradient). k is thermal conductivity (W/m·K). Heat flux (per area) = q'' = q/A = −k·dT/dx (W/m²).

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How to practise

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