Nusselt number
Sherwood number
Schmidt number
Stanton number
✅ The correct answer is option C.
Heat Transfer MCQs
In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is
More
Less
Same
More or less; depends on the nature of solution
✅ The correct answer is option A.
The most conducive surface for dropwise condensation to occur is the __________ surface.
Coated
Oily
Glazed & polished
Smooth
✅ The correct answer is option B.
Which of the following has the minimum thermal conductivity?
Nitrogen
Steel
Carbon black
Tar
✅ The correct answer is option A.
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.
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be
Less than 45°C
More than 45°C
Equal to 45°C
Initially decreases and remains constant thereafter
✅ The correct answer is option B.
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.
1.49
1
4.88
None of these
✅ The correct answer is option A.
For what value of Prandtl number, St = f/2?
1.5
1
> 1
< 1
✅ The correct answer is option B.