The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Some

Less

Either more or less ; depends on the nature of vapor

More

Some

Less

Either more or less ; depends on the nature of vapor

More

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Heat Transfer
In the equation Q = UAΔt; Δt is

Geometric mean temperature difference

Arithmetic mean temperature difference

The difference of average bulk temperatures of hot and cold fluids

Logarithmic mean temperature difference

Geometric mean temperature difference

Arithmetic mean temperature difference

The difference of average bulk temperatures of hot and cold fluids

Logarithmic mean temperature difference

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Heat Transfer
The main purpose of providing fins on heat transfer surface is to increase the

Mechanical strength of the equipment

Temperature gradient

Heat transfer co-efficient

Heat transfer area

Mechanical strength of the equipment

Temperature gradient

Heat transfer co-efficient

Heat transfer area

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit fluid temperature = wall temperature

Graetz number > 100

Exit fluid temperature < wall temperature

Exit-fluid temperature > wall temperature

Exit fluid temperature = wall temperature

Graetz number > 100

Exit fluid temperature < wall temperature

Exit-fluid temperature > wall temperature

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Heat Transfer
What is the emissivity of a black body?

0.5

1

0.9

0.5

1

0.9

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Heat Transfer
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

Increases

Decreases

May increase or decrease; depends on the feed

Is not affected

Increases

Decreases

May increase or decrease; depends on the feed

Is not affected

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Heat Transfer

Heat Transfer The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Heat Transfer In the equation Q = UAΔt; Δt is

Heat Transfer The main purpose of providing fins on heat transfer surface is to increase the

Heat Transfer Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Heat Transfer What is the emissivity of a black body?

Heat Transfer In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Heat Transfer
In the equation Q = UAΔt; Δt is

Heat Transfer
The main purpose of providing fins on heat transfer surface is to increase the

Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Heat Transfer
What is the emissivity of a black body?

Heat Transfer
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient