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Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?
Related MCQs
Thermal conductivities of most of the liquids __________ with rise in temperature?
The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________?
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions?
The energy radiated from a surface Q at absolute temperature T is related as__________?
Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
Crystallisation of solids from a homogeneous solution is a/an __________ process?
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low__________?
__________ paint has the maximum absorption coefficient ?
Baffles are provided in heat exchangers to increase the__________?
Prandtl and Reynold’s analogies are identical for Prandtl number value of__________?
The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________?
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will __________?
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number?
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by__________?
Which is the most suitable for the concert-ration of highly concentrated solution ?
A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an__________?
A hot body will radiate heat most rapidly, if its surface is__________?
Prandtl number is the ratio of__________?
Rate of heat transfer by vaporisation from pools of water is affected by the __________?
The purpose of providing bleed points in the evaporator is to__________?
With increase in temperature, the thermal conductivity of steel__________?
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is__________?
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?
Radiation heat transfer rates does not depend upon the__________?
If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is__________?
Which of the following is not concerned with the heat transfer ?
__________ equation relates the thermal conductivity of a solid to its temperature ?
Unsteady state heat conduction occurs, when__________?
For specified tube outside diameter, higher BWG means higher__________?
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time __________?
Value of Prandtl number for water ranges from__________?
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________?
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________?
Dropwise condensation occurs on __________ surfaces?
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is__________?
The type of liquor circulation system to be ‘ employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid?
For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?
In a backward feed multiple effect evaporator __________ ?
The sum of reflectivity and absorptivity for an opaque body is equal to__________?
Steam is routed through the tube in case of a __________ evaporator?
Multiple effect evaporation is generally recommended, when the__________?
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C?
A __________ surface has the maximum thermal emissivity out of the following ?
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?
Which of the following has the highest thermal conductivity ?
Circulation pump is located below the evaporator to__________?
Economy of an evaporator is influenced by the__________?
‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a__________?
At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the__________?
Film boiling occurs at __________ pressure?
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?
A. 0.4 – 0.6
B. 1-1.3
C. 1.8-2
D. 2 – 2.4
Correct Answer:
1-1.3
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Last Updated:
March 03, 2019