1531. What is the geometric mean of two heat transfer areas A₁ and A₂ ?
√(A₁ . A₂)
√(A₁ + A₂)
1/2 √(A₁ . A₂)
2 √(A₁ . A₂)
✅ The correct answer is option A.
Chemical Engineering
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1532. The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
Heating volume
Heat transfer area
Nusselt number
None of these
✅ The correct answer is option B.
1533. In forced convection, the Nusselt number is a function of
Re and Pr
Re and Gr
Pr and Gr
Re and Sc
✅ The correct answer is option A.
1534. In which mode of heat transfer, the Biot number is important?
Transient heat conduction
Natural convection
Forced convection
Radiation
✅ The correct answer is option A.
1535. Viscous & heat sensitive liquids are concentrated in __________ evaporators.
Open pan
Long tube
Agitated film
None of these
✅ The correct answer is option C.
1536. A black body when hot, emits heat radiation of __________ wavelengths.
Small
Large
All
One fixed
✅ The correct answer is option C.
1537. Steam economy in case of a triple effect evaporator will be
1
< 1
> 1
Between 0 and 1
✅ The correct answer is option C.
1538. A dephlegmator is a
Total condenser
Vacuum evaporator
Partial condenser
Double pipe heat exchanger
✅ The correct answer is option C.
1539. Water always boils when its
Temperature reaches 100° C
Vapour pressure equals 76 cm of Hg
Saturated vapour pressure equals the external pressure on its surface
Saturated vapour pressure is less than the atmospheric pressure
✅ The correct answer is option C.
1540. A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is
125
133
150
160
✅ The correct answer is option D.