Parallel
Mixed
Counterflow
Same in either A, B or C
✅ The correct answer is option D.
Engineering
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1242. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
180
970
3.97
None of these
✅ The correct answer is option A.
1243. The ratio of kinematic viscosity to thermal diffusivity is called the __________ number.
Peclet
Prandtl
Stanton
Nusselt
✅ The correct answer is option B.
1244. In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)
D/5 and D
D/2 and 2 D
D/4 and 2 D
D and 2 D
✅ The correct answer is option A.
1245. (NGr x NPr) is called the __________ number.
Graetz
Reyleigh
Nusselt
Stanton
✅ The correct answer is option B.
1246. The rate of emission of radiation by a body does not depend upon the
Wavelength of radiation
Surface temperature of the body
Nature of the surface
Shape and porosity of the body
✅ The correct answer is option D.
1247. 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
Convection becomes important
Conduction becomes important
Radiation becomes important
Sub-cooled boiling occurs
✅ The correct answer is option C.
1248. Crystal size in a continuous crystalliser depends upon the
Rate of heat transfer
Degree of turbulence
Degree of supersaturation
All of the above
✅ The correct answer is option D.
1249. Loss of heat from untagged steam pipe to the ambient air is by
Conduction
Convection
Radiation
All of the above
✅ The correct answer is option D.
1250. Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.
40
95
70
50
✅ The correct answer is option C.