Heat Transfer MCQs | Page - 1

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M

Manisha Agrawal • 9.34K Points
Tutor III

Q. 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
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M

Manisha Agrawal • 9.34K Points
Tutor III

Q. 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
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M

Manisha Agrawal • 9.34K Points
Tutor III

Q. A perfect black body is one which

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

Manisha Agrawal • 9.34K Points
Tutor III

Q. A non-dimensional number generally associated with natural convection heat transfer is

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

Manisha Agrawal • 9.34K Points
Tutor III

Q. 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
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M

Manisha Agrawal • 9.34K Points
Tutor III

Q. 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

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

Manisha Agrawal • 9.34K Points
Tutor III

Q. Planck's law holds good for

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

Manisha Agrawal • 9.34K Points
Tutor III

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

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

Manisha Agrawal • 9.34K Points
Tutor III

Q. 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
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M

Manisha Agrawal • 9.34K Points
Tutor III

Q. 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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