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Heat-transfer Questions Set 11:

Quiz Mode

How many distinct modes of heat transfer are generally recognized in the literature?

Solution:

What are the boundary conditions applicable for a fin insulated at the tip?

Option 1, 2

Option 2, 3

Option 1, 3

Option 1, 2, 3

Solution:

The temperature distribution associated with radial conduction through a sphere is represented by a

Parabola

Ellipse

Linear

Hyperbola

Solution:

What is the primary factor that determines the thermal conductivity of liquids?

Pressure

Volume

Pressure and volume

Pressure and temperature

Solution:

Consider a 10-cm-diameter spherical ball at 600 K suspended in air. Assuming the ball closely approximates a blackbody, determine the total blackbody emissive power.

7.348 kW/m

7.35 W

7.348 kW/m²

7.34 W/m²

Solution:

Which of the following is an example of forced convection?

Chilling effect of cold wind on a warm body

Flow of water in condenser tubes

Cooling of billets in the atmosphere

Heat exchange on cold and warm pipes

Solution:

When is the efficiency of a fin (η) maximum?

For a very short fin (length approaching zero)

Effectiveness doesn't depend on length

For fins of length twice the width

For a very long fin (length approaching infinity)

Solution:

The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m × 0.6 m × 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace.

15.24 m

16.34 m

14.54 m

13.76 m

Solution:

If we have the value of convective heat transfer coefficient, what other value is required to find the critical thickness of insulation for a spherical object?

Thermal conductivity

Radius of sphere

Temperature of sphere

Thermal resistance

Solution:

A steel plate with a thickness of 5 cm and a thermal conductivity of 20 W/m⋅K is subjected to a uniform heat flux of 800 W/m² on one surface A. The other surface B transfers heat to the ambient air at 25°C with a heat transfer coefficient of 80 W/m²⋅K. What is the temperature of surface B?

25°C

35°C

45°C

55°C

Heat-transfer Questions Set 11:

How many distinct modes of heat transfer are generally recognized in the literature?

Solution:

What are the boundary conditions applicable for a fin insulated at the tip?

Solution:

The temperature distribution associated with radial conduction through a sphere is represented by a

Solution:

What is the primary factor that determines the thermal conductivity of liquids?

Solution:

Consider a 10-cm-diameter spherical ball at 600 K suspended in air. Assuming the ball closely approximates a blackbody, determine the total blackbody emissive power.

Solution:

Which of the following is an example of forced convection?

Solution:

When is the efficiency of a fin (η) maximum?

Solution:

The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m × 0.6 m × 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace.

Solution:

If we have the value of convective heat transfer coefficient, what other value is required to find the critical thickness of insulation for a spherical object?

Solution:

A steel plate with a thickness of 5 cm and a thermal conductivity of 20 W/m⋅K is subjected to a uniform heat flux of 800 W/m² on one surface A. The other surface B transfers heat to the ambient air at 25°C with a heat transfer coefficient of 80 W/m²⋅K. What is the temperature of surface B?

Solution:

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