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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Highly viscous
Corrosive
Scaling
Salty

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

Evaporators operate under vacuum
Evaporators opreate at atmospheric pressure
Solution has an elevation of boiling point
None of these

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

R and S
P and R
P and Q
P and S

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Heat Transfer
According to Reynolds analogy, Stanton number is equal to

f/4
2f
f/2
f

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Heat Transfer
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

555
55.5
0.55
0.15

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Heat Transfer
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low

Hardness
All of these
Suspended solids content
Dissolved soilds content

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MORE MCQ ON Heat Transfer

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