A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

KA>2 kB

KA < 0.5kB

CPA > CPB

CPA < CPB

KA>2 kB

KA < 0.5kB

CPA > CPB

CPA < CPB

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Heat Transfer
Evaporation by thermocompression results in the

Saving of steam

Realisation of multiple effect economy in a single effect

Both A and B

None of these

Saving of steam

Realisation of multiple effect economy in a single effect

Both A and B

None of these

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Heat Transfer
Unsteady state heat conduction occurs, when

Three dimensional heat flow is concerned

Temperature distribution is independent of time

Heat flows in one direction only

Temperature distribution is dependent on time

Three dimensional heat flow is concerned

Temperature distribution is independent of time

Heat flows in one direction only

Temperature distribution is dependent on time

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

40.5

26.8

34.4

25

40.5

26.8

34.4

25

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Heat Transfer
Prandtl number is the ratio of

Momentum diffusivity to thermal diffusivity

Momentum diffusivity to mass diffusivity

Thermal diffusivity to momentum diffusivity

Thermal diffusivity to mass diffusivity

Momentum diffusivity to thermal diffusivity

Momentum diffusivity to mass diffusivity

Thermal diffusivity to momentum diffusivity

Thermal diffusivity to mass diffusivity

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Heat Transfer
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will

Increase by 1.8 times

Increase by 216

Decrease by 22

Remain unchanged

Increase by 1.8 times

Increase by 216

Decrease by 22

Remain unchanged

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Heat Transfer

Heat Transfer Evaporation by thermocompression results in the

Heat Transfer Unsteady state heat conduction occurs, when

Heat Transfer Prandtl number is the ratio of

Heat Transfer If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will

Heat Transfer
Evaporation by thermocompression results in the

Heat Transfer
Unsteady state heat conduction occurs, when

Heat Transfer
Prandtl number is the ratio of

Heat Transfer
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will