A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

None of these

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

None of these

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

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Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Increases

Remain constant

May increase or decrease depending on temperature

Decreases

Increases

Remain constant

May increase or decrease depending on temperature

Decreases

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Water

Melting ice

Steam

Solid ice

Water

Melting ice

Steam

Solid ice

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P=1, T = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P=1, T = 0 and a = 0

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Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Fourth power of temperature

Fourth power of absolute temperature

Absolute temperature

Square of temperature

Fourth power of temperature

Fourth power of absolute temperature

Absolute temperature

Square of temperature

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Heat and Mass Transfer
The time constant of a thermocouple is

The time taken to attain 63.2% of the value of initial temperature difference

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain the final temperature to be measured

Determined by the time taken to reach 100°C from 0°C

The time taken to attain 63.2% of the value of initial temperature difference

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain the final temperature to be measured

Determined by the time taken to reach 100°C from 0°C

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Heat and Mass Transfer

Heat and Mass Transfer A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Heat and Mass Transfer Which of the following is expected to have highest thermal conductivity?

Heat and Mass Transfer Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

Heat and Mass Transfer According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Heat and Mass Transfer The time constant of a thermocouple is

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Heat and Mass Transfer
The time constant of a thermocouple is