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Heat Transfer

Heat Transfer
Evaporator tubes are generally

Inclined
Random
Vertical
Horizontal

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Heat Transfer
Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.

100-500
1000-1500
18537
5000-15000

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Heat Transfer
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

48.7
77.2
63.8
71.2

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Heat Transfer
Prandtl number for most of dry gases is about

0.001
150
70
0.72

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Heat Transfer
In a backward feed multiple effect evaporator

Feed flows from low pressure to high pressure
No pumps are required between successive effects
None of these
Feed is introduced in the first effect

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Heat Transfer
Heat flux is the time rate of heat transfer per unit

area
volume
length
none of the listed here

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