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Heat-transfer Questions Set 34:

Quiz Mode

Determine the length characteristic of a cube.

L/3

L/6

6 × L

3 × L

Solution:

How many types of convection processes are there?

One

Three

Four

Two

Solution:

Heat exchangers are classified into how many main categories?

Solution:

Determine the length characteristic of a plate.

t /2

2 x t

t /6

6 x t

Solution:

Which statement about the optical properties of gases is true?

Transmissivity of gases is zero

Absorptivity of gases is zero

Reflectivity of gases is unity

Reflectivity of gases is close to zero

Solution:

If two bodies have the same material finish and the ratio of their diameters is 2:1, and both are heated to the same temperature and allowed to cool, then the ratio of their rate of cooling is

1:1

2:1

1:2

4:1

Solution:

Find the temperature change of the plate with a heat transfer rate of 44.77 W and a thermal resistance of 3.797 degrees Celsius.

200 degrees Celsius.

11.78 degrees Celsius.

0.084 degrees Celsius.

48.56 degrees Celsius.

Solution:

In a counterflow heat exchanger, cold fluid enters eld at 30° C and leaves at 50°C, whereas the hot fluid enters at 150°C and leaves at 130°C. The mean temperature difference for this case is

Indeterminate

20° C

80° C

100° C

Solution:

The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.9 m × 0.9 m × 2 m long with a wall 0.5 m thick all around. Calculate the shape factor for the furnace.

15.2 m

10.4 m

18.4 m

19.5 m

Solution:

A wall surface has an inner temperature of 100 degrees Celsius and an outer temperature of 30 degrees Celsius. The total thermal resistance of the wall is 58.167 x 10^-5 K/W. Determine the heat transfer rate through the wall.

1.2034 W

5.8167 x 10^5 W

58167 W

1.2034 x 10^5 W

Heat-transfer Questions Set 34:

Determine the length characteristic of a cube.

Solution:

How many types of convection processes are there?

Solution:

Heat exchangers are classified into how many main categories?

Solution:

Determine the length characteristic of a plate.

Solution:

Which statement about the optical properties of gases is true?

Solution:

If two bodies have the same material finish and the ratio of their diameters is 2:1, and both are heated to the same temperature and allowed to cool, then the ratio of their rate of cooling is

Solution:

Find the temperature change of the plate with a heat transfer rate of 44.77 W and a thermal resistance of 3.797 degrees Celsius.

Solution:

In a counterflow heat exchanger, cold fluid enters eld at 30° C and leaves at 50°C, whereas the hot fluid enters at 150°C and leaves at 130°C. The mean temperature difference for this case is

Solution:

The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.9 m × 0.9 m × 2 m long with a wall 0.5 m thick all around. Calculate the shape factor for the furnace.

Solution:

A wall surface has an inner temperature of 100 degrees Celsius and an outer temperature of 30 degrees Celsius. The total thermal resistance of the wall is 58.167 x 10^-5 K/W. Determine the heat transfer rate through the wall.

Solution:

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