1602. Agitated film evaporator is suitable for concentrating __________ liquids.
Foaming
Viscous
Very thin
Corrosive
✅ The correct answer is option B.
1604. One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to
Heat the water from 0°C to 100°C
Evaporate the water
To superheat the steam
Data insufficient, can
✅ The correct answer is option B.
1606. At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?
0.5
1
1.5
80
✅ The correct answer is option B.
1608. The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is
Nusselt number
Sherwood number
Schmidt number
Stanton number
✅ The correct answer is option C.
1610. The most conducive surface for dropwise condensation to occur is the __________ surface.
Coated
Oily
Glazed & polished
Smooth
✅ The correct answer is option B.
1612. 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.
1614. 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.
1616. Fourier’s law applies to the heat transfer by
Convection
Radiation
Conduction
All of the above
✅ The correct answer is option C.
1619. In natural convection heat transfer, the correlating parameter is the
Graetz number
Eckert number
Grashoff number
Bond number
✅ The correct answer is option C.
1622. Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.
Oct-50
100-500
1000-1500
5000-15000
✅ The correct answer is option D.