Chemical Heat Transfer

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

Byadmin March 3, 2019August 24, 2021

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

CHEMICAL ENGINEERING | Chemical Heat Transfer

Baffles are provided in heat exchangers to____________?

Baffles are provided in heat exchangers to____________?A. Remove dirt
B. Increase heat transfer rate
C. Reduce vibrations
D. Reduce heat transfer rate

Read More Baffles are provided in heat exchangers to____________?
Chemical Heat Transfer

For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?

For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?

A. Decrease
B. Increase
C. First decrease and then increase
D. First increase and then decrease

Read More For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?
Chemical Heat Transfer

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?

A. Buffer zone
B. Turbulent core
C. Both A. and B.
D. Viscous sub-layer

Read More At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?
Chemical Heat Transfer

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

A. 35.5
B. 43.75
C. 81.25
D. 48.25

Read More Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?
Chemical Heat Transfer

A 2-4 heat exchanger involves__________________?

A 2-4 heat exchanger involves__________________?

A. Only counter-flow of fluids
B. Only parallel-flow of fluids
C. Both counter and parallel-flow of the fluids
D. Smaller pressure drop compared to 1-2 exchanger

Read More A 2-4 heat exchanger involves__________________?
Chemical Heat Transfer

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?

A. Increase by 1.8 times
B. Decrease by 22
C. Increase by 216
D. Remain unchanged

Read More If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?

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