Nitrogen
Steel
Carbon black
Tar
✅ The correct answer is option A.
Engineering MCQs
Kirchoff’s law is applicable to
Monochromatic radiation only
Total radiation only
Both A and B
Only volumes and not to surfaces
✅ The correct answer is option C.
Nusselt number (for forced convection heat transfer) is a function of the __________ number.
Prandtl
Reynolds
Both A & B
Neither A nor B
✅ The correct answer is option C.
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
1
10
20
30
✅ The correct answer is option A.
__________ equation relates the thermal conductivity of a solid to its temperature.
Antonie
Kopp’s
Lee’s
Kistyakowski
✅ The correct answer is option C.
Fourier’s law applies to the heat transfer by
Convection
Radiation
Conduction
All of the above
✅ The correct answer is option C.
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the
Solution has an elevation of boiling point
Evaporators operate under vacuum
Evaporators opreate at atmospheric pressure
None of these
✅ The correct answer is option A.
When warm and cold liquids are mixed, the heat transfer is mainly by
Conduction
Convection
Radiation
Both A & C
✅ The correct answer is option B.
In natural convection heat transfer, the correlating parameter is the
Graetz number
Eckert number
Grashoff number
Bond number
✅ The correct answer is option C.
Heat exchangers operating, when the asymptotic range is reached,
Provide very large heat transfer co-efficient
Results in making part of the heating surface inactive
Results in abruptly increased velocity
None of these
✅ The correct answer is option B.