With increase in temperature, the thermal conductivity of most liquids

Heat Transfer
With increase in temperature, the thermal conductivity of most liquids

Decreases

Increases

First increases upto a certain temperature and then becomes constant

Remains same

Decreases

Increases

First increases upto a certain temperature and then becomes constant

Remains same

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

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Heat Transfer
According to Reynolds analogy, Stanton number is equal to

2f

f/4

f/2

f

2f

f/4

f/2

f

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Heat Transfer
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

55.5

0.55

0.15

555

55.5

0.55

0.15

555

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Heat Transfer
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Nature of the body

Wavelength of radiation

Temperature of the body

None of these

Nature of the body

Wavelength of radiation

Temperature of the body

None of these

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Heat Transfer
Rate of heat transfer by vaporisation from pools of water is affected by the

All of these

Surface tension of water

Nature of heating surface and distribution of bubbles

Viscosity of water

All of these

Surface tension of water

Nature of heating surface and distribution of bubbles

Viscosity of water

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Heat Transfer

Heat Transfer With increase in temperature, the thermal conductivity of most liquids

Heat Transfer In a gas-liquid shell and tube heat exchanger, the

Heat Transfer According to Reynolds analogy, Stanton number is equal to

Heat Transfer The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Heat Transfer Rate of heat transfer by vaporisation from pools of water is affected by the

Heat Transfer
With increase in temperature, the thermal conductivity of most liquids

Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Heat Transfer
According to Reynolds analogy, Stanton number is equal to

Heat Transfer
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.

Heat Transfer
Rate of heat transfer by vaporisation from pools of water is affected by the