Heat Transfer (3151909) MCQ

MCQs of Radiation

MCQ No - 1

heat transfer by radiation mainly depends upon

(A)

its temperature

(B)

nature of the body

(C)

its surface properties

(D)

all of the above


D
MCQ No - 2

According to Stefan-Boltzmann law, ideal radiators emit energy at a rate proportional to 

(A)

absolute temperature

(B)

square of temperature

(C)

the fourth power of absolute temperature

(D)

fifth power of temperature


C
MCQ No - 3

The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.

(A)

equal to

(B)

directly proportional to

(C)

inversely proportional to

(D)

none of the above


B
MCQ No - 4

A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body

(A)

697.2 W/m2

(B)

786.9 W/m2

(C)

324.7 W/m2

(D)

592.1 W/m2


A
MCQ No - 5

During a cold winter season, a person prefers to sit near a fire. Which of the following modes of heat transfer provides him the maximum heat?

(A)

Conduction from the fire

(B)

If it is near the fire, convection sounds good

(C)

Convection and radiation together

(D)

Radiation will provide quick warmth


D