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Heat And Mass Transfer(Engineering > Mechanical Engineering ) Questions and Answers
Home
Topic
Engineering
Mechanical Engineering
Heat And Mass Transfer
Question 1.
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 1 and τ = 0
α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0
Explanation:-
Answer: Option C. ->
α = 0, ρ = 0 and τ = 1
Explanation :
Question 2.
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 1 and τ = 0
α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0
Explanation:-
Answer: Option C. ->
α = 0, ρ = 0 and τ = 1
Explanation :
Question 3.
Planck’s law holds good for
black bodies
polished bodies
all coloured bodies
all of the above
Explanation:-
Answer: Option A. ->
black bodies
Explanation :
Question 4.
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
Minimum energy
Maximum energy
Both (A) and (B)
None of these
Explanation:-
Answer: Option B. ->
Maximum energy
Explanation :
Question 5.
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a
Black body
Grey body
Opaque body
White body
Explanation:-
Answer: Option A. ->
Black body
Explanation :
Question 6.
The expression q = ρ at4 is called
Fourier equation
Stefan-Boltzmann equation
Newton Reichmann equation
Joseph-Stefan equation
Explanation:-
Answer: Option B. ->
Stefan-Boltzmann equation
Explanation :
Question 7.
The expression q = ρ at4 is called
Fourier equation
Stefan-Boltzmann equation
Newton Reichmann equation
Joseph-Stefan equation
Explanation:-
Answer: Option B. ->
Stefan-Boltzmann equation
Explanation :
Question 8.
Planck’s law holds good for
black bodies
polished bodies
all coloured bodies
all of the above
Explanation:-
Answer: Option A. ->
black bodies
Explanation :
Question 9.
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 1 and τ = 0
α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0
Explanation:-
Answer: Option C. ->
α = 0, ρ = 0 and τ = 1
Explanation :
Question 10.
Planck’s law holds good for
black bodies
polished bodies
all coloured bodies
all of the above
Explanation:-
Answer: Option A. ->
black bodies
Explanation :
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