Heat Transfer Questions

• Increasing the liquor level in the evaporator results in the
• The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )
• In case of evaporators, liquid entrainment results primarily due to
• A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides
• Pick out the wrong statement.
• The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
• Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)
• Thermal conductivity of a conducting solid material depends upon its
• Economy of a multiple effect evaporator is not influenced much by the
• For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
• Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is
• Baffles in the shell side of a shell and tube heat exchanger
• The actual temperature drop across the heating surface in an evaporator depends on the
• Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
• The unit of heat transfer co-efficient in SI unit is
• Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.
• Black liquor generated during paper manufacture is concentrated in a
• Leidenfrost point is a term concerned with the
• Reynold's analogy states that
• Pick out the wrong statement.