1613. 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.
1615. __________ equation relates the thermal conductivity of a solid to its temperature.
Antonie
Kopp’s
Lee’s
Kistyakowski
✅ The correct answer is option C.
1618. 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.
1621. In a forward feed multiple effect evaporator, the pressure is
Highest in last effect
Lowest in last effect
Same in all effects
Dependent on the number of effects
✅ The correct answer is option B.
1624. A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides
Higher economy
Lower capacity
Both A & B
Lower economy
✅ The correct answer is option A.
1627. Stefan-Boltzman law applies to __________ body.
Black
White
Grey
Any colour
✅ The correct answer is option A.
1630. Rate of crystallisation does not depend upon the
Extent of supersaturation
Turbulence within the solution
Number and active surface area of the crystals
None of these
✅ The correct answer is option D.
1633. The advantage of backward feed multiple effect evaporators over forward feed units is that
Heat sensitive material can be handled
There is no additional cost of pumping
Most concentrated liquid is at highest temperature
Equal heat transfer co-efficients exist in various effects
✅ The correct answer is option C.
1635. Nucleate boiling is promoted
On polished surfaces
On rough surfaces
In the absence of agitation
None of these
✅ The correct answer is option B.
1637. Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is
0.1
>1
< 1
L
✅ The correct answer is option A.