Test: Intensity of Radiations

# Test: Intensity of Radiations

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## 10 Questions MCQ Test Heat Transfer | Test: Intensity of Radiations

Test: Intensity of Radiations for Chemical Engineering 2022 is part of Heat Transfer preparation. The Test: Intensity of Radiations questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Intensity of Radiations MCQs are made for Chemical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Intensity of Radiations below.
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Test: Intensity of Radiations - Question 1

### 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.

Detailed Solution for Test: Intensity of Radiations - Question 1

Solid angle is represented by α.

Test: Intensity of Radiations - Question 2

### 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.

Detailed Solution for Test: Intensity of Radiations - Question 2

It is the ratio of arc of length on the circle to the radius of the circle.

Test: Intensity of Radiations - Question 3

### 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

Detailed Solution for Test: Intensity of Radiations - Question 3

It must be a circle of diameter of a sphere.

Test: Intensity of Radiations - Question 4

If I denotes the normal intensity and I α represents the intensity at angle α, then

Detailed Solution for Test: Intensity of Radiations - Question 4

The intensity of radiation in a direction from the normal is proportional to cosine of the angle.

Test: Intensity of Radiations - Question 5

The intensity of normal radiation I n is how much times the emissive power?

Detailed Solution for Test: Intensity of Radiations - Question 5

= σ T 4/ π and E = σ T 4.

Test: Intensity of Radiations - Question 6

A small surface emits diffusively, and measurements indicate that the total intensity associated with emission in the normal direction I = 6500 W/square m sr. The emitted radiation is intercepted by three surfaces. Mark calculations for intensity associated with emission Detailed Solution for Test: Intensity of Radiations - Question 6

For a diffusion emitter, the intensity of the emitted radiation is independent of direction.

Test: Intensity of Radiations - Question 7

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

Detailed Solution for Test: Intensity of Radiations - Question 7

in = α q A P = 70.7 W. Q out = E σ A T 4.

Test: Intensity of Radiations - Question 8

The total emissive power of the emitter with area d A and temperature T is given by

Detailed Solution for Test: Intensity of Radiations - Question 8

E = I π d A.

Test: Intensity of Radiations - Question 9

A black body of 0.2 m2 area has an effective temperature of 800 K. Calculate the intensity of normal radiations

Detailed Solution for Test: Intensity of Radiations - Question 9

I= α T 4/π = 7396.28 W/m2 sr.

Test: Intensity of Radiations - Question 10

The energy radiated out decreases with increases in α and becomes zero at an angle of

Detailed Solution for Test: Intensity of Radiations - Question 10

α = I n cos α. So at 90 degree it becomes zero.

## Heat Transfer

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## Heat Transfer

58 videos|70 docs|85 tests