Fourier's law of heat conduction applies to __________ surfaces. (A) Isothermal (B) Non-isothermal (C) Both (A) and (B) (D) Neither (A) and (B)

Fourier's law of heat conduction applies to __________ surfaces.

(A) Isothermal

(B) Non-isothermal

(C) Both (A) and (B)

(D) Neither (A) and (B)

by

1 Answer

Answer :

(C) Both (A) and (B)

by

Related questions

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State Fourier's law of 'conduction and Stefan Boltzmann law of radiation. Express mathematically.

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Convective heat transfer, in which heat is transferred by movement of warmed matter is described by (A) Fourier's law (B) Newton's law of cooling (C) Fick's law (D) None of these

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In Fourier's law, the proportionality constant is called the (A) Heat transfer co-efficient (B) Thermal diffusivity (C) Thermal conductivity (D) Stefan-Boltzmann constant

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In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation. (A) Adiabatic (B) Isothermal (C) Non-adiabatic (D) None of these

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Stefan-Boltzmann law applies to __________ body. (A) Black (B) White (C) Grey (D) Any colour

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Heat transfer by __________ is almost absent in case of fluidised bed drying operation. (A) Radiation (B) Conduction (C) Convection (D) Both (B) & (C)

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Pick out the wrong statement. (A) Heat transfer from a hot body to cold body by the emission of heat waves is called radiation (B) Filmwise condensation takes place on non-wettable surfaces (C) The boiling point of a solution is affected by liquid head as well as boiling point elevation (D) None of these

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For assurance engagements which are neither audits nor reviews of historical financial information, the following standard applies: a. PSAs b. PSAEs c. PSREs d. PSRSs

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. __________ chart is known as transient heat conduction chart. (A) Dirhing's (B) Heisler's (C) Mollier's (D) Cox

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For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone. (A) Extremely low(B) Low(C) High(D) No

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In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate. (A) Geometric (B) Arithmetic (C) Logarithmic (D) Either (A), (B) or (C)

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In __________ process, there is an increase in entropy with no degradation of energy. (A) Isothermal expansion (B) Isochoric heat addition (C) Polytropic expansion (D) Isobaric heat addition

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LMTD for counter-flow and parallel flow heat exchanger will be the same, when the (A) Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid) (B) Outlet temperature of both the hot and cold fluid are same (C) Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid (D) None of these

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Last Answer : (A) Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)

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Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation? (A) Langmuir's assumption applies to every adsorbed layer (B) There is no dynamic equilibrium between successive layer (C) The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process (D) None of these

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Nusselt number (for forced convection heat transfer) is a function of the __________ number. (A) Prandtl (B) Reynolds (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Nusselt number (for forced convection heat transfer) is a function of the __________ number. (A) Prandtl (B) Reynolds (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

For a constant volume process __________ by the system is used only to increase the internal energy. (A) Heat absorbed (B) Work done (C) Both (A) & (B) (D) Neither (A) nor (B)

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Last Answer : (B) Work done

Rayleigh's equation applies to __________ distillation. (A) Continuous (B) Steam (C) Differential (D) Flash

Description : Rayleigh's equation applies to __________ distillation. (A) Continuous (B) Steam (C) Differential (D) Flash

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Rayleigh equation applies to __________ distillation. (A) Differential (B) Flash (C) Equilibrium (D) Molecular

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__________ equation applies to diffusivities in liquids. (A) Gilliland (B) Hirschfelder (C) Wilke and Chang (D) None of these

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Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is (A) Thin walled having the value of Ao Ai /< 2 (B) Thick walled (C) Having the value of Ao /Ai > 2 (D) Both (B) and (C)

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Last Answer : (A) Thin walled having the value of Ao Ai /< 2

When warm and cold liquids are mixed, the heat transfer is mainly by (A) Conduction (B) Convection (C) Radiation (D) Both (A) & (C

Description : When warm and cold liquids are mixed, the heat transfer is mainly by (A) Conduction (B) Convection (C) Radiation (D) Both (A) & (C

Last Answer : (B) Convection

Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place (A) Between two bodies in physical contact with each other (B) Between two bodies not in physical contact with each other (C) From one part of a body to the another part of the same body (D) Both 'b' & 'c'

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Last Answer : (B) Between two bodies not in physical contact with each other

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Last Answer : (C) Mixed convection (both free and forced)

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by (A) Conduction (B) Convection (C) Radiation (D) Both 'a' & 'b'

Description : Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by (A) Conduction (B) Convection (C) Radiation (D) Both 'a' & 'b'

Last Answer : Option C

Pick out the wrong statement. (A) In a static mass of liquid, the pressure at a point is the same for all liquids (B) Pressure decreases exponentially with elevation in an isothermal atmosphere(C) Atmospheric pressure = absolute pressure ‒ gage pressure(D) As per Pascal's law, the pressure at a point in a static or uniformlymoving fluid is equal in all directions

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Last Answer : (A) In a static mass of liquid, the pressure at a point is the same for all liquids

Very __________ coals are completely devoid of cokability i.e., it is non-coking. (A) Young (B) Mature (C) Both 'a' & 'b' (D) Neither 'a' nor 'b

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Last Answer : (C) Both 'a' & 'b'

Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings. (A) Incompressible (B) Non-viscous (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings. (A) Incompressible (B) Non-viscous (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Signal normally used to study non-ideal flow by stimulus response technique is __________ input. (A) Pulse (B) Step (C) Both (A) & (B) (D) Neither (A) nor (B)

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Last Answer : (C) Both (A) & (B)

The single parameter model proposed for describing non-ideal flow is the __________ model. (A) Tank in series (B) Dispersion (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : The single parameter model proposed for describing non-ideal flow is the __________ model. (A) Tank in series (B) Dispersion (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Non-catalytic fluid-solid reactions are represented by __________ model. (A) Continuous reaction (B) Unreacted core (C) Both (A) and (B) (D) Neither (A) and (B)

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Last Answer : (C) Both (A) and (B)

Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation. (A) Polar (B) Non-polar (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation. (A) Polar (B) Non-polar (C) Both (A) & (B) (D) Neither (A) nor (B)

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Work done may be calculated by the expression ∫ p dA for __________ processes. (A) Non-flow reversible (B) Adiabatic (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Work done may be calculated by the expression ∫ p dA for __________ processes. (A) Non-flow reversible (B) Adiabatic (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)