. __________ chart is known as transient heat conduction chart.
(A) Dirhing's
(B) Heisler's
(C) Mollier's
(D) Cox
Description : Which one shows the diagrammatic heat balance in a furnace? (A) Sankey diagram (B) Cox chart (C) Ostwald chart (D) None of these
Last Answer : (A) Sankey diagram
Description : In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the (A) Ostwald chart (B) Cox chart (C) Sankey diagram (D) None of these
Last Answer : (C) Sankey diagram
Description : The Fourier number (defined as a.t/L 2 ) is used in the analysis of problem involving heat transfer by (A) Forced convection (B) Natural convection (C) Transient conduction (D) Steady state conduction
Last Answer : (C) Transient conduction
Description : In which mode of heat transfer, the Biot number is important? (A) Transient heat conduction (B) Natural convection (C) Forced convection (D) Radiation
Last Answer : (A) Transient heat conduction
Description : Cox chart is useful in the design of (A) Distillation column (B) Evaporator (C) Dryer (D) Crystallise
Last Answer : (A) Distillation column
Description : Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature). (A) log P vs. T (B) log P vs. log T (C) T vs. P (D) P vs. log T
Last Answer : (A) log P vs. T
Description : Fourier's law of heat conduction applies to __________ surfaces. (A) Isothermal (B) Non-isothermal (C) Both (A) and (B) (D) Neither (A) and (B)
Last Answer : (C) Both (A) and (B)
Description : For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone. (A) Extremely low (B) Low (C) High (D) No
Last Answer : (C) High
Description : 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)
Last Answer : (C) Logarithmic
Description : Heat transfer by __________ may not necessarily require the presence of a medium. (A) Conduction (B) Natural convection (C) Forced convection (D) Radiation
Last Answer : (D) Radiation
Description : Heat transfer by __________ is almost absent in case of fluidised bed drying operation. (A) Radiation (B) Conduction (C) Convection (D) Both (B) & (C)
Last Answer : A) Radiation
Description : 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 ... = 283 s (B) t = 356 s (C) t = 400 s (D) t = 800 s
Last Answer : (D) t = 800 s
Description : Unsteady state heat conduction occurs, when (A) Temperature distribution is independent of time (B) Temperature distribution is dependent on time (C) Heat flows in one direction only (D) Three dimensional heat flow is concerned
Last Answer : (B) Temperature distribution is dependent on time
Description : Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by (A) Eddies current (B) Conduction (C) Convection (D) None of these
Last Answer : (B) Conduction
Description : Fourier's law applies to the heat transfer by (A) Convection (B) Radiation (C) Conduction (D) All (A), (B) & (C)
Last Answer : (C) Conduction
Description : 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)
Last Answer : (A) Thin walled having the value of Ao Ai /< 2
Description : Thermal diffusivity is the most important in heat transfer by (A) Conduction (B) Radiation
Last Answer : (A) Conduction
Description : Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called (A) Radiation (B) Natural convection (C) Forced convection (D) Conduction
Last Answer : (C) Forced convection
Description : Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that (A) There is no internal heat generation (B) Boundary surfaces are isothermal (C) Material is anisotropic (D) Constant temperature gradient exists
Last Answer : (C) Material is anisotropic
Description : Mode of heat transfer involved in the cooling of air cooled internal combustion engine is (A) Conduction (B) Natural convection (C) Forced convection (D) None of these
Last Answer : (B) Natural convection
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
Description : If heat transfer rate varies with the time, it is termed as (A) Forced convection (B) Steady state conduction (C) Monochromatic radiation (D) None of these
Last Answer : (D) None of these
Description : In pipe flow, heat is transferred from hot wall to the liquid by(A) Conduction only (B) Forced convection only (C) Forced convection and conduction (D) Free and forced convection
Last Answer : (C) Forced convection and conduction
Description : 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 (A) 0.2 (B) 0.4 (C) 0.6 (D) 0.8
Last Answer : (C) 0.6
Description : In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is (A) Linear (B) Hyperbolic (C) Parabolic (D) None of these
Last Answer : (C) Parabolic
Description : Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because (A) Convection becomes important (B) Conduction becomes important (C) Radiation becomes important (D) Sub-cooled boiling occurs
Last Answer : (C) Radiation becomes important
Description : Loss of heat from untagged steam pipe to the ambient air is by (A) Conduction (B) Convection (C) Radiation (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : View factor is important in heat transfer by (A) Steady state conduction (B) Natural convection (C) Forced convection (D) Radiation
Description : Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal tothe direction of heat flow.) (A) t (B) 1/ρ (C) 1/A (D) All (A), (B) & (C)
Description : 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 ... of a body to the another part of the same body (D) Both 'b' & 'c'
Last Answer : (B) Between two bodies not in physical contact with each other
Description : Pick out the wrong statement. (A) Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection (B) The ratio NNu /NRe . Npr is ... convection to that by conduction (D) The Colburn jH factor for heat transfer is given by Nst Npr
Last Answer : (D) The Colburn jH factor for heat transfer is given by Nst Npr
Description : When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is: (A) Free convection (B) Entry length problem in laminar forced ... (developing thermal boundary layer) (C) Mixed convection (both free and forced) (D) Forced convection
Last Answer : (C) Mixed convection (both free and forced)
Description : Which area is used in case of heat flow by conduction through a cylinder? (A) Logarithmic mean area (B) Arithmetic mean area (C) Geometric mean area (D) None of these
Last Answer : (A) Logarithmic mean area
Description : Pick out the correct statement. (A) 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F (B) In steady state heat conduction, the only property of the substance which determines the ... in the direction of temperature rise (D) In heat transfer by forced convection, Grashoff number is very important
Last Answer : (B) In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
Description : In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by (A) Conduction (B) Convection (C) Radiation (D) Cannot be predicted
Last Answer : (C) Radiation
Description : In reverberatory furnace, charge is heated mainly by (A) Conduction (B) Natural convection (C) Radiation of heat from the roof of the combustion chamber (D) None of these
Last Answer : (C) Radiation of heat from the roof of the combustion chamber
Description : Maximum heat transfer in high temperature furnaces is by (A) Conduction (B) Convection (C) Radiation (D) Either (A), (B) or (C); depends on the type of furnace
Description : In salt bath furnace, heat is transferred to the charge mainly by (A) Conduction (B) Convection (C) Radiation (D) None of these
Description : Gibbs phase rule finds application, when heat transfer occurs by (A) Conduction (B) Convection (C) Radiation (D) Condensation
Last Answer : (D) Condensation
Description : In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be (A) Conduction (B) Radiation (C) Natural convection (D) Forced convection
Last Answer : (B) Radiation
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
Description : Upto the critical radius of insulation, added insulation, will (A) Increase the heat loss (B) Decrease heat loss and will have no effect beyond that (C) Decrease heat flux (D) Reduce convection heat loss compared to conduction heat less
Last Answer : Option B
Description : reduction in thermal resistance during heat transfer does not occur in the (A) Convection heat transfer by stirring the fluid and cleaning the heating surface (B) Conduction heat transfer by ... Radiation heat transfer by increasing the temperature and reducing the emissivity (D) None of these
Description : Liquids that evaporate quickly are known as _________ liquids. A. Viscous B. Transient C. Volatile D. Light
Last Answer : ANSWER: C
Description : Which type of vibrations are also known as transient vibrations? A) Undamped vibrations B) Damped vibrations C) Torsional vibrations D) Transverse vibrations
Last Answer : B) Damped vibrations
Description : Which type of vibrations are also known as transient vibrations? a. Undamped b. Damped c. Torsional d. Transverse vibrations
Last Answer : b. Damped
Description : How can you block Cox Cable from taking screen shots of your computer screen?
Last Answer : i think your roommate is taking the piss out of you. in order for them to do this, you’d have to grant them certain access to your computer, which is not available to them by default.
Description : What is Cox ?
Last Answer : Coaxial cable , also called cox for short , is used in Ethernet local area network .
Last Answer : Cox 's Bazar The sea On the beach Length Yes 155 What . Mr. _ .