Test: Intensity of Radiations - Mechanical Engineering MCQ
10 Questions MCQ Test Heat Transfer - Test: Intensity of Radiations
The solid angle is defined by a region by the rays of a sphere, and is measured as
Where,
An is projection of incident surface normal to line of propagation.
An is projection of incident surface normal to line of propagation.
The plane angle is defined by a region by the rays of a circle, and is measured as\
Where,
L is arc of length and r is radius of circle.
L is arc of length and r is radius of circle.
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When the incident surface is a sphere, the projection of surface normal to the line of propagation is the silhouette disk of the sphere which is a circle of the diameter of
If I n denotes the normal intensity and I α represents the intensity at angle α, then
The intensity of normal radiation I n is how much times the emissive power?
A small surface emits diffusively, and measurements indicate that the total intensity associated with emission in the normal direction I n = 6500 W/square m sr. The emitted radiation is intercepted by three surfaces. Mark calculations for intensity associated with emission
Consider a deep-space probe constructed as 1 m diameter polished aluminum sphere. Estimate the equilibrium temperature that the probe reaches if the solar energy received is 300 W/m2. For solar radiation, absorptivity of aluminum is 0.3 and the average emissivity appropriate for aluminum at low temperature is 0.04
The total emissive power of the emitter with area d A and temperature T is given by
A black body of 0.2 m2 area has an effective temperature of 800 K. Calculate the intensity of normal radiations
The energy radiated out decreases with increases in α and becomes zero at an angle of
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57 videos|77 docs|86 tests
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