Which of the following has the highest thermal conductivity ?
Which of the following has the highest thermal conductivity ?
A. Brick
B. Air
C. Water
D. Silver
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The main function of baffles provided in a shell and tube heat exchanger is to______________?
The main function of baffles provided in a shell and tube heat exchanger is to______________?A. Facilitate the cleaning of outer tube surface
B. Enhance turbulence
C. Hold the tubes in position
D. All A , B & CFluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?A. Existence of thermal boundary layer
B. Temperature gradient produced due to density difference
C. Buoyancy of the bubbles produced at active nucleation site
D. None of these200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?
200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?A. 0.5
B. 0.05
C. 0.1
D. 0.15Which has the lowest Prandtl number ?
Which has the lowest Prandtl number ?A. Liquid metal
B. Aqueous solution
C. Water
D. Lube oilThe heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?A. (ΔT)2
B. (ΔT)4
C. (ΔT)3
D. √(ΔT)Prandtl number for most of dry gases is about________________?
Prandtl number for most of dry gases is about________________?A. 0.001
B. 0.72
C. 70
D. 150