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Correction is applied to LMTD for __________ flow?
Related MCQs
Increasing the liquor level in the evaporator results in the__________?
In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell) ?
Double pipe heat exchangers are used__________?
A body is called grey if the monochromatic emissivity of the body is__________?
While the total emissivity of a perfect black body is unity, the same for a real body is__________?
Crystal size in a continuous crystalliser depends upon the__________?
Boiling of milk in an open vessel is an example of __________ boiling?
Black liquor generated during paper manufacture is concentrated in a__________?
What is Nusselt number ?
In the equation Q = UAΔt; Δt is__________?
For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in__________?
Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately ?
Graetz number is given by__________?
Reynold’s analogy states that__________?
Which of the following has the minimum thermal conductivity ?
For an ideal black body__________?
For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator?
Leidenfrost point is a term concerned with the__________?
Which of the following is not used as a medium for high temperature heating ?
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8?
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred__________?
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________?
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is__________?
Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?
What is the absorptivity of a black body?
Economy of a multiple effect evaporator is not influenced much by the__________?
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube__________?
In case of evaporators, liquid entrainment results primarily due to__________?
Heat exchangers operating, when the asymptotic range is reached, ?
In counter flow compared to parallel flow, ?
Mode of heat transfer involved in the cooling of air cooled internal combustion engine is__________?
In a single effect evaporator, the economy is__________?
Small scale evaporation is done in a__________?
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________?
Low thermal conductivity of heat insulating materials is due to its__________?
Low thermal conductivity of heat insulating materials is due to its__________?
In case of a vertical tube evaporator, with increase in the liquor level, the__________?
The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the__________?
Thermal diffusivity is given by__________?
In a forward feed multiple effect, the pressure build up will be__________?
Which of the following has the minimum absorptivity ?
Convective heat transfer, in which heat is transferred by movement of warmed matter is described by__________?
If h1 = inner film co-efficient and /h2 = outer film co-efficient, then the overall heat transfer co-efficient is__________?
In an extended surface heat exchanger, fluid having lower co-efficient__________?
The critical radius ‘r’ of insulation on a pipe is given by__________?
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of__________?
A 10 cm dia 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__________?
Sensible heat of hot industrial flue gases cannot be recovered by a/an__________?
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased?
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?
In a multiple effect evaporator, the effect of boiling point elevation is to__________?
Correction is applied to LMTD for __________ flow?
A. Parallel
B. Counter
C. Cross
D. None of these
Correct Answer:
Cross
✔
Last Updated:
March 03, 2019