HEAT TRANSFER QUIZ

In the free convection regime of pool boiling, the heat flux is proportional to

Δt1/2

Δt5/4

Δt

Δt2

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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

To superheat the steam

Data insufficient, can

Heat the water from 0°C to 100°C

Evaporate the water

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Circulation pump is located below the evaporater to

None of these

Avoid frequent priming

Avoid cavitation

Create more suction head

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In a forward feed multiple effect, the pressure build up will be

least at the outlet of the last effect

highest at the outlet of the last effect

least at the inlet of the first effect

highest at the inlet of the last effect

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Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

R and S

P and S

P and R

P and Q

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Reynold's analogy states that (where, St = Stanton number f = friction factor)

St = f/2

St = 4f

St = f1/2

St = f/4

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Film boiling is usually not desired in commercial equipments, because

it is difficult to maintain

none of the listed here

it is not economic

the heat transfer rate is low in view of the large temperature drop. @

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The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

(ΔT)²

(ΔT)⁴

√(ΔT)

(ΔT)³

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Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is

0.8

0.2

0.4

0.6

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For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Occupies smaller space

Is more economical

Is easy to operate and maintain

All of these

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