Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Temperature of the incoming vapor is very high

Higher condensing film co-efficient is desired

Lower pressure drop through the exchanger is desired

Condensate is corrosive in nature

Temperature of the incoming vapor is very high

Higher condensing film co-efficient is desired

Lower pressure drop through the exchanger is desired

Condensate is corrosive in nature

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Heat Transfer
Water always boils when its

Saturated vapour pressure equals the external pressure on its surface

Vapour pressure equals 76 cm of Hg

Temperature reaches 100° C

Saturated vapour pressure is less than the atmospheric pressure

Saturated vapour pressure equals the external pressure on its surface

Vapour pressure equals 76 cm of Hg

Temperature reaches 100° C

Saturated vapour pressure is less than the atmospheric pressure

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Heat Transfer
Which of the following has the highest thermal conductivity ?

Black

Water

Air

Silver

Black

Water

Air

Silver

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Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

W/m

W/m.k²

None, A is just a number

W/m.k

W/m

W/m.k²

None, A is just a number

W/m.k

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Heat Transfer
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

Increases

Remains constant

May increase or decrease, depends on the vacuum

Decreases

Increases

Remains constant

May increase or decrease, depends on the vacuum

Decreases

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Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.

Logarithmic

Linear

Parabolic

Hyperbolic

Logarithmic

Linear

Parabolic

Hyperbolic

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Heat Transfer

Heat Transfer Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer Water always boils when its

Heat Transfer Which of the following has the highest thermal conductivity ?

Heat Transfer The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

Heat Transfer In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

Heat Transfer If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.

Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Heat Transfer
Water always boils when its

Heat Transfer
Which of the following has the highest thermal conductivity ?

Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

Heat Transfer
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

Heat Transfer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.