Q. Increasing the liquor level in the evaporator results in the

View solution

Q. Pick out the wrong statement.

View solution

Q. Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

View solution

Q. The actual temperature drop across the heating surface in an evaporator depends on the

View solution

Q. Which of the following is not used as a medium for high temperature heating ?

View solution

Q. Presence of a non-condensing gas in a condensing vapour

View solution

Q. The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

View solution

Q. Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

View solution

Q. Which of the following is concerned with both heat and mass transfer ?

View solution

Q. A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

View solution

Q. A 10 cm diameter steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

View solution

Q. Fouling factor

View solution

Q. In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient

View solution

Q. The steam ejector is used to

View solution

Q. For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

View solution

Q. 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

View solution

Q. Crystal size in a continuous crystalliser depends upon the

View solution

Q. Heat waves

View solution

Q. Air is best heated with steam in a heat exchanger of

View solution

Q. Which of the following is generally considered as opaque surface towards radiations?

View solution