Chemical Heat Transfer

With increase in porosity, the thermal conductivity of a solid substance__________________?

Byadmin March 3, 2019August 24, 2021

With increase in porosity, the thermal conductivity of a solid substance__________________?

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on the solid

Chemical Heat Transfer

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

A. Scaling
B. Highly viscous
C. Corrosive
D. Salty

Read More Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?
Chemical Heat Transfer

Heat exchangers operating, when the asymptotic range is reached, ?

Heat exchangers operating, when the asymptotic range is reached, ?

A. Provide very large heat transfer co-efficient
B. Results in making part of the heating surface inactive
C. Results in abruptly increased velocity
D. None of these

Read More Heat exchangers operating, when the asymptotic range is reached, ?
Chemical Heat Transfer

A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 – 1 shell and tube heat exchanger is available. The best arrangement is_______________?

A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 – 1 shell and tube heat exchanger is available. The best arrangement is_______________?

A. Counter flow with process stream on shell side
B. Counter flow with process stream on tube side
C. Parallel flow with process stream on shell side
D. Parallel flow with process stream on tube side

Read More A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 – 1 shell and tube heat exchanger is available. The best arrangement is_______________?
Chemical Heat Transfer

Thermal conductivities of most of the liquids _______________ with rise in temperature?

Thermal conductivities of most of the liquids _______________ with rise in temperature?

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on the liquid

Read More Thermal conductivities of most of the liquids _______________ with rise in temperature?
Chemical Heat Transfer

Thermal conductivity of a gas at low density, ___________ with increase in temperature ?

Thermal conductivity of a gas at low density, ___________ with increase in temperature ?

A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease; depends on the gas

Read More Thermal conductivity of a gas at low density, ___________ with increase in temperature ?
Chemical Heat Transfer

Heat exchanger tubes are never made of_________________?

Heat exchanger tubes are never made of_________________?

A. Plain carbon steel
B. Stainless steel
C. Lead
D. Copper

Read More Heat exchanger tubes are never made of_________________?

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