Test: Kirchoff’s Law

# Test: Kirchoff’s Law

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## 10 Questions MCQ Test Heat Transfer | Test: Kirchoff’s Law

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

### If radiant energy EB emitted by the black surface strikes the non-black surface. If non-black surface has absorptivity α, it will absorb how much radiations?

Detailed Solution for Test: Kirchoff’s Law - Question 1

The remainder (1 – α) will be reflected back for full absorption at the black surface.

Test: Kirchoff’s Law - Question 2

### If two surfaces are at the same temperature, then the conditions correspond to mobile thermal equilibrium for which the resultant interchange of heat is zero are

Detailed Solution for Test: Kirchoff’s Law - Question 2

The remainder (1 – α) will be reflected back for full absorption at the black surface.

Test: Kirchoff’s Law - Question 3

### The absorptivity of black body equals to

Detailed Solution for Test: Kirchoff’s Law - Question 3

The absorptivity of black body equals to unity.

Test: Kirchoff’s Law - Question 4

A diathermanous body

Detailed Solution for Test: Kirchoff’s Law - Question 4

It behaves like a body that allows all the incident radiation to pass through it.

Test: Kirchoff’s Law - Question 5

Choose the false statement

Detailed Solution for Test: Kirchoff’s Law - Question 5

Rough surfaces give diffused reflections. Reflections from highly polished and smooth surfaces have regular characteristics.

Test: Kirchoff’s Law - Question 6

The emissivity and the absorptivity of a real surface are equal for radiation with identical temperature and wavelength. This law is referred to as

Detailed Solution for Test: Kirchoff’s Law - Question 6

Emissivity and absorptivity are related by Kirchhoff’s law.

Test: Kirchoff’s Law - Question 7

With an increase in wavelength, the monochromatic emissive power of a black body

Detailed Solution for Test: Kirchoff’s Law - Question 7

It firstly increases to its maximum value and then decreases to zero.

Test: Kirchoff’s Law - Question 8

The temperature of a solid surface changes from 27 K to 627 K. The emissive power changes would then confirm to the ratio

Detailed Solution for Test: Kirchoff’s Law - Question 8

E2/E1 = (T2/T1)4 = 81.

Test: Kirchoff’s Law - Question 9

If the temperature of a hot body is increased by 50%, the amount of radiations emitted by it would increase by nearly

Detailed Solution for Test: Kirchoff’s Law - Question 9

E2/E1 = (T2/T1)4 = 5.06.

Test: Kirchoff’s Law - Question 10

Consider two surfaces, one absolutely black and the other non-black. These surfaces are arranged parallel to each other and so close that the radiation of one falls totally on the other. Choose the correct option

Detailed Solution for Test: Kirchoff’s Law - Question 10

The radiant energy E emitted by the black surface strikes the non-black surface. If the non-black surface has absorptivity α, it will absorb α E b radiations.

## Heat Transfer

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## Heat Transfer

58 videos|70 docs|85 tests