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The dimensional formula for thermal resistance is,

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Important Questions on Calorimetry and Heat Transfer

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 22

A wall has two layers

A

and

B

, each made of different material. Both the layers have the same thickness. The thermal conductivity for

A

is twice that of

B

and under steady condition, the temperature difference across the wall is

36 ° C

. The temperature difference across the layer

A

is,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 23

In a steady state, the temperatures at the end

A

and

B

20 cm

long rod

A B

are

100 ° C

and

0 ° C

. The temperature of a point

9 cm

from

A

is,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 24

SI unit of thermal conductivity is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 25

A wall has two layers

A

and

B

each made of different materials. The layer

A

10 cm

thick and

B

20 cm

thick. The thermal conductivity of

A

is thrice that of

B

. Under thermal equilibrium temperature difference across the wall is

35 ° C

. The difference of temperature across the layer

A

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 26

In the figure, $A B C$ is a conducting rod whose lateral surfaces are insulated. The length of the section $A B$ is one-half of that of $B C$ , and the respective thermal conductivities of the two sections are as given in the figure. If the ends $A$ and $C$ are maintained at $0 ° C$ and $70 ° C$ respectively, the temperature of junction $B$ in the steady state is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 27

Equal temperature differences exist between the ends of two metallic rods

1

and

2

of equal lengths. Their thermal conductivities are

K_{1}

and

K_{2}

and area of cross section are

A_{1}

and

A_{2}

, respectively. The condition of equal rates of heat transfer is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 28

Two rods of copper and brass $(K_{C} > K_{B})$ of same length and area of the cross-section are joined as shown. End $A$ is kept at $100 ° C$ and end $B$ at $0 ° C$ . The temperature at the junction

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 16 - Calorimetry and Heat Transfer>Objective Problems>Q 29

Three rods of same dimensions have thermal conductivities $3 K, 2 K$ and $K$ . They are arranged as shown, with their ends at $100 ° C, 50 ° C$ and $0 ° C$ . The temperature of their junction is

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The dimensional formula for thermal resistance is,

Important Questions on Calorimetry and Heat Transfer

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