Heat Transfer QUESTIONS AND ANSWERS

Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part4 : 11 to 15

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

11.A grey body is one whose absorptivity

varies with temperature

varies with the wave length of incident ray

varies with both

does not vary with temperature and wave length of the incident ray

there is no such criterion.

12.The emissive power of a body depends upon its

temperature

wave length

physical nature

all of the above

none of the above.

13.Depending on the radiating properties, body will be transparent when

p = 0, x = 0 and a = 1

p=l,x = 0, and a = 0

p = 0, T= l, and a = 0

X = 0, a + p = 1

a = 0,x + p= 1.

14.If the temperature of a solid surface changes form 27�C to 627�C, then its emissive power changes in the ratio of

81.

15.Absorptivity of a body will be equal to its emissivity

at all temperatures

at one particular temperature

when system is under thermal equiplibrium

at critical temperature

for a polished body.

More Heat Transfer QUESTIONS AND ANSWERS available in next pages

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Mechanical Engineering Questions And Answers :: Heat Transfer: part4

Heat Transfer QUESTIONS AND ANSWERS

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