The amount of radiation energy emitted from a surface at a g

The amount of radiation energy emitted from a surface at a given wavelength depends on: The material of the body The condition of its surface The surface temperature All of the above Fouling of heat exchangers: Decrease with temperature and decreasing with velocity Decrease with temperature and increase with velocity Increase with temperature and increase with velocity Increase with temperature and decreasing with velocity Diffuse emitter is a: Gray body Black body White body Gray and blackbody Emissivity of Gray body in comparison to blackbody is Higher Lower Equal Slightly higher Wave length range of thermal radiation: 1/10 to 1/100 mu m 1/10 to 1/1000 mu m 1/10 to 100 mu m 1/10 to 1000 mu m Square pattern tube layouts in heat exchangers are employed where Laminar flow is experienced Turbulent flow is experienced High fouling is experienced Low fouling is experienced

Solution

1.c..only temperature

2.c.increase with temp decrease with velocity

3.b.black body is diffuse emitter

4.lower..b

5.0.1um to 100um..c

6.c.where high fouling is experienced