Related Questions

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
A Lower heat transfer area
B Lower steam economy
C Higher steam economy
D Higher solute concentration in the product
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the
A Solution has an elevation of boiling point
B Evaporators operate under vacuum
C Evaporators opreate at atmospheric pressure
D None of these
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima
The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the
A Trouton's rule
B Kopp's rule
C Antonie equation
D Kistyakowsky equation
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
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
Steam economy in case of a triple effect evaporator will be
A 1
B > 1
C Between 0 and 1
If we increase the pressure on a substance (which is at its triple point), then the triple point
A Increases
B Decreases
C Remains unchanged
D May increase or decrease ; depends on the substance
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
A 2
B 20.8
C 20.2
D 20.5

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