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Chemical Heat Transfer
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In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?
Related MCQs
For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone?
Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________?
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when__________?
Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then__________?
Maximum heat transfer rate is achieved in __________ flow?
Radiator of an automobile engine is a __________ type of heat exchanger?
In forced convection, the Nusselt number is a function of __________?
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used__________?
The Stefan-Boltzmann constant depends on the__________?
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it__________?
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes?
Electro-magnetic spectrum range, which is important for radiation varies from __________ microns?
In a gas-liquid shell and tube heat exchanger, the__________?
In a shell and tube heat exchanger, square pitch compared to triangular pitch__________?
Planck’s distribution law is valid for __________ bodies?
Steam trap is used to__________?
LMTD for counter-flow and parallel flow heat exchanger will be the same, when the__________?
Vent pipes are provided in a condenser to __________?
The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is__________?
The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to __________ analogy?
Open pan evaporators are preferred to be used, when the solution to be concentrated is__________?
When warm and cold liquids are mixed, the heat transfer is mainly by__________?
At constant temperature, the thermal conductivities of gases __________ with rise in pressure?
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__________?
It is not preferable to use superheated steam in evaporators, because of its very__________?
__________ heat exchanger is used for chilling oil to be dewaxed?
If heat transfer rate varies with the time, it is termed as__________?
The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________?
The absorptivity of a body is equal to its emissivity __________?
A perfect black body is a perfect __________ of radiation?
jH factor for heat transfer depends upon the __________ number?
The actual temperature drop across the heating surface of an evaporator depends on the__________?
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is__________?
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because__________?
Which of the following has the lowest overall heat transfer co-efficient ?
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?
The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation?
In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate?
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are__________?
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to__________?
A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is __________?
Solid angle subtended by the finite surface at the radiating element is__________?
Corrosiveness of steam condensate is due to the presence of__________?
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?
Tube expansion allowances exist in __________ heat exchanger?
Multiple effect evaporation accounts for__________?
A black body does not __________ radiation?
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a__________?
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is__________?
Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU?
Stefan’s block body radiation law can also be derived from __________ law?
In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?
A. Nucleate
B. Local
C. Pool
D. Saturated
Correct Answer:
Local
✔
Last Updated:
March 03, 2019