Description

This mock test of Test: Intensity Of Radiations for Chemical Engineering helps you for every Chemical Engineering entrance exam.
This contains 10 Multiple Choice Questions for Chemical Engineering Test: Intensity Of Radiations (mcq) to study with solutions a complete question bank.
The solved questions answers in this Test: Intensity Of Radiations quiz give you a good mix of easy questions and tough questions. Chemical Engineering
students definitely take this Test: Intensity Of Radiations exercise for a better result in the exam. You can find other Test: Intensity Of Radiations extra questions,
long questions & short questions for Chemical Engineering on EduRev as well by searching above.

QUESTION: 1

The solid angle is defined by a region by the rays of a sphere, and is measured as

Where,

A_{n} is projection of incident surface normal to line of propagation.

Solution:

Solid angle is represented by α.

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.

Solution:

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

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

Solution:

It must be a circle of diameter of a sphere.

QUESTION: 4

If I _{n }denotes the normal intensity and I _{α} represents the intensity at angle α, then

Solution:

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

QUESTION: 5

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

Solution:

I _{n }= σ T^{ 4}/ π and E = σ T^{ 4}.

QUESTION: 6

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

Solution:

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

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/m^{2}. For solar radiation, absorptivity of aluminum is 0.3 and the average emissivity appropriate for aluminum at low temperature is 0.04

Solution:

Q _{in }= α q A _{P} = 70.7 W. Q _{out }= E σ _{b }A T ^{4}.

QUESTION: 8

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

Solution:

E = I _{n }π d A.

QUESTION: 9

A black body of 0.2 m^{2} area has an effective temperature of 800 K. Calculate the intensity of normal radiations

Solution:

I_{n }= α T ^{4}/π = 7396.28 W/m^{2} sr.

QUESTION: 10

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

Solution:

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

### Solar Radiations

Video | 02:59 min

### Radiations and their wavelengths

Doc | 1 Page

### Magnetization and Magnetic Intensity

Video | 01:24 min

### Pitch, Amplitude, Loudness, Intensity

Doc | 1 Page

- Test: Intensity Of Radiations
Test | 10 questions | 10 min

- Test: Radiations Shields
Test | 10 questions | 10 min

- Test: Gaseous Radiations
Test | 10 questions | 10 min

- Test: Electromagnetic Radiations
Test | 16 questions | 16 min

- Test: Solar Radiations
Test | 10 questions | 10 min