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# Heat Transfer MCQs | Page - 1

Dear candidates you will find MCQ questions of Heat Transfer here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

## `Q. 1) Absorptivity of a body will be equal to its emissivity`

(A) at all temperatures
(B) at one particular temperature
(C) when system is under thermal equi-librium
(D) at critical temperature

## `Q. 2) A steam pipe is to be insulated by two insulating materials put over each other. For best results`

(A) better insulation should be put over pipe and better one over it
(B) inferior insulation should be put over pipe and better one over it
(C) both may be put in any order
(D) whether to put inferior OIL over pipe or the better one would depend on steam temperature

## `Q. 3) A perfect black body is one which`

(A) is black in colour
(B) reflects all heat
(D) absorbs heat radiations of all wave lengths falling on it

## `Q. 4) A non-dimensional number generally associated with natural convection heat transfer is`

(A) Grashoff number
(B) Nusselt number
(C) Weber number
(D) Reynold number

## `Q. 5) A grey body is one whose absorptivity`

(A) varies with temperature
(B) varies with wavelength of the incident ray
(C) is equal to its emissivity
(D) does not vary with temperature and. wavelength of the incident ray

(A) 0.45
(B) 0.55
(C) 0.4
(D) 0.75

## `Q. 7) Planck's law holds good for`

(A) black bodies
(B) polished bodies
(C) all coloured bodies
(D) all of the above

(A) 3
(B) 6
(C) 81
(D) 27

## `Q. 9) Depending on the radiating properties, body will be transparent when`

(A) p = 0, x = 0 and a = 1
(B) p=l,x = 0, and a = 0
(C) p = 0, T= l, and a = 0
(D) X = 0, a + p = 1

## `Q. 10) According of Kirchhoff's law,`

(A) radiant heat is proportional to fourth power of absolute temperature
(B) emissive power depends on temperature
(C) emissive power and absorptivity are constant for all bodies
(D) ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body.

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