Chemical Heat Transfer

Chemical Heat Transfer

Radiation heat transfer rates does not depend upon the_________________?

Radiation heat transfer rates does not depend upon the_________________?

A. Type of absorbing surface
B. Distance between the heat source and the object receiving the heat
C. Surface area and temperature of the heat source
D. None of these

Read More Radiation heat transfer rates does not depend upon the_________________?
Chemical Heat Transfer

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?

A. 1
B. 2
C. 1/2
D. 4

Read More If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?
Chemical Heat Transfer

_____________ equation relates the thermal conductivity of a solid to its temperature ?

_____________ equation relates the thermal conductivity of a solid to its temperature ?

A. Antoine
B. Kopp’s
C. Lee’s
D. Kistyakowsky

Read More _____________ equation relates the thermal conductivity of a solid to its temperature ?
Chemical Heat Transfer

Unsteady state heat conduction occurs, when_______________?

Unsteady state heat conduction occurs, when_______________?

A. Temperature distribution is independent of time
B. Temperature distribution is dependent on time
C. Heat flows in one direction only
D. Three dimensional heat flow is concerned

Read More Unsteady state heat conduction occurs, when_______________?
Chemical Heat Transfer

For specified tube outside diameter, higher BWG means higher___________________?

For specified tube outside diameter, higher BWG means higher___________________?

A. Tube thickness
B. Cross-sectional area
C. Weight per unit length
D. None of these

Read More For specified tube outside diameter, higher BWG means higher___________________?
Chemical Heat Transfer

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?

A. t = 283 s
B. t = 356 s
C. t = 400 s
D. t = 800 s

Read More A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?
Chemical Heat Transfer

Value of Prandtl number for water ranges from_________________?

Value of Prandtl number for water ranges from_________________?

A. 1 to 2
B. 5 to 10
C. 100 to 500
D. 1000 to 2000

Read More Value of Prandtl number for water ranges from_________________?
Chemical Heat Transfer

For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?

For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?

A. Same
B. Different
C. Never different
D. Linearly related

Read More For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?
Chemical Heat Transfer

1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?

1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?

A. 520
B. 200
C. 400
D. 500

Read More 1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?
Chemical Heat Transfer

Dropwise condensation occurs on ______________ surfaces?

Dropwise condensation occurs on ______________ surfaces?

A. Clean and dirt free
B. Smooth clean
C. Contaminated cooling
D. Polished

Read More Dropwise condensation occurs on ______________ surfaces?