Q1. Explain Fourier’s law for heat of conduction.

This is question 1 (3 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q1. Write short notes on Natural Convection.

This is question 1 (4 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q3. Discuss Planck’s law of radiation.

This is question 3 (3 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Basics of Heat Transfer | B.E. Semester IV Summer 2021 | GTU Papers

Q: Q1. Derive equation for heat transfer through a composite wall made up of different materials in close thermal contact with each other, with no heat loss to surrounding.

This is question 1 (7 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q: Q2. Give the physical significance of (i) Nusselt Number

This is question 2 (3 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q: Q2. Explain the terms absorptivity, emissivity, transmissivity and reflectivity for heat transfer by radiation.

This is question 2 (4 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q: Q2. Using Dimension analysis derive expression for forced convection for the fluid flowing inside tube in a turbulent flow.

This is question 2 (7 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q: Q2. Describe different analogy between heat and mass transfer.

This is question 2 (7 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q: Q3. Steel ball bearing (k=50W/mK, α=1.3x10-5 m2/s) having a diameter of 40 mm are heated to a temperature of 650 oC and then quenched in a tank of oil at 55 oC. If heat transfer coefficient between the ball bearing and oil is 300 W/m2K, determine the time required for bearing to reach at a temperature of 200 oC.

This is question 3 (4 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Q: Q3. State and explain Stefan-Boltzmann Law of radiation.

This is question 3 (7 marks) from the GTU Basics of Heat Transfer BE Summer 2021 question paper. Subject code: 3143611.

Questions25

Explain Fourier’s law for heat of conduction.

[3 marks]

Write short notes on Natural Convection.

[4 marks]

Derive equation for heat transfer through a composite wall made up of different materials in close thermal contact with each other, with no heat loss to surrounding.

[7 marks]

Give the physical significance of (i) Nusselt Number

[3 marks]

Explain the terms absorptivity, emissivity, transmissivity and reflectivity for heat transfer by radiation.

[4 marks]

Using Dimension analysis derive expression for forced convection for the fluid flowing inside tube in a turbulent flow.

[7 marks]

Describe different analogy between heat and mass transfer.

[7 marks]

Discuss Planck’s law of radiation.

[3 marks]

Steel ball bearing (k=50W/mK, α=1.3x10-5 m2/s) having a diameter of 40 mm are heated to a temperature of 650 oC and then quenched in a tank of oil at 55 oC. If heat transfer coefficient between the ball bearing and oil is 300 W/m2K, determine the time required for bearing to reach at a temperature of 200 oC.

[4 marks]

State and explain Stefan-Boltzmann Law of radiation.

[7 marks]

Define : White body, Grey body, Black body

[3 marks]

Define thermal conductivity and discuss the effect of temperature on thermal conductivity of solid, liquid and gas.

[4 marks]

Ahot metallic ball having surface temperature 800 oC behaves as a gray body with emissivity of 0.8. Calculate (i) the emissive power, (ii) the wavelength corresponding to the maximum spectral intensity of radiation.

[7 marks]

What do you mean by fouling of heat exchangers?

[3 marks]

Write Dittus-Boeltier equation explaining each term

[4 marks]

Discuss construction and working of Plate type heat exchanger.

[7 marks]

Draw the temperature profile for Co-current and Counter- current heat exchanger.

[3 marks]

Write short notes on Natural Convection.

[4 marks]

What is importance of LMTD? Derive the equation for parallel flow arrangement.1

[7 marks]

Explain Dropwise and Filmwise Condensation.

[3 marks]

Describe Regimes of Pool Boiling.

[4 marks]

Define objectives of evaporation and explain construction, working and applications of Calendria type evaporator

[7 marks]

Write short note on condensation of superheated vapors.

[3 marks]

Explain Boiling Point Elevation

[4 marks]

Write a short note on Multiple Effect Evaporator.

[7 marks]

Basics of Heat Transfer — Summer 2021

Questions25

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