Peclet number (Pe) is given by____________________?
Peclet number (Pe) is given by____________________?
A. Pe = Re.Pr
B. Pe = Re/Pr
C. Pe = Pr/Re
D. Pe = Nu.Re
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C. Water
D. AirIn counter flow compared to parallel flow, ?
In counter flow compared to parallel flow, ?A. LMTD is greater
B. Less surface area is required for a given heat transfer rate
C. Both A. and B.
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In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred_________________?A. Through a metallic wall
B. By direct contact of hot flue gas with air
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hot material
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In SI units, fouling factor is expressed in __________________?A. m2°K/W
B. W/m2°K
C. m2°K
D. m°K/WBoiling point elevation of an ideal solution_______________?
Boiling point elevation of an ideal solution_______________?A. Increases rapidly with temperature rise
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C. In independent of pressure
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Stefan-Boltzmann law applies to _____________ body?A. Black
B. White
C. Grey
D. Any colour