Mechanical Engineering Questions And Answers :: Heat Transfer: part4



Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part4 : 1 to 5

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

1.A perfect black body is one which

is black in colour
reflects all heat
transmits all heat radiations
abslprbs heat radiations of all wave lengths falling on it
fully opaque.

2.40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.45
0.55
0.40
0.75
0.60.

3.Depending on the radiating properties, a body will be black when

p = 0, x = 0 and a = 1
p= l,T = 0anda = 0
p = 0, x = 1 and a = 0
x = 0, a + p = 0
a = 0,x + p= 1.

4.Planck's law holds good for

black bodies
polished bodies
all colored bodies
all of the above
none of the above.

5.The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

temperature
thickness
area
time
area and time.

More Heat Transfer QUESTIONS AND ANSWERS available in next pages

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