Kirchoffs law
Stefan's law
Wien' law
Planck's law
A. Kirchoffs law
Less than those for gases
Less than those for liquids
More than those for liquids and gases
More or less same as for liquids and gases
Liquids
Energy
Temperature
Entropy
Direct mixing of hot and cold fluids
A complete separation between hot and cold fluids
Flow of hot and cold fluids alternately over a surface
Generation of heat again and again
Zeroth law of thermodynamics
First law of thermodynamic
Second law of the thermodynamics
Kirchoff's law
Increases
Decreases
Remain constant
May increase or decrease depending on temperature
RN = hl/k
RN = μ cp/k
RN = ρ V l /μ
RN = V²/t.cp
Maximum
Minimum
Zero
None of these
Cold water inlet and outlet
Hot medium inlet and outlet
Hot medium outlet and cold water inlet
Hot medium outlet and cold water outlet
Absolute temperature
T²
T⁵
T
One
Two
Three
Four
Increases
Decreases
Remain constant
May increase or decrease depending on temperature
High thickness of insulation
High vapour pressure
Less thermal conductivity insulator
A vapour seal
Radiant heat is proportional to fourth power of absolute temperature
Emissive power depends on temperature
Emissive power and absorptivity are constant for all bodies
Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body.
Kirchhoff's law
Stefan's law
Wines law
Planck's law
Radiators in automobile
Condensers and boilers in steam plants
Condensers and evaporators in refrigeration and air conditioning units
All of the above
Stanton number
Nusselt number
Biot number
Peclet number
h = k/ ρS
h = ρS/k
h = S/ρk
h = kρ/S
Temperature
Thickness
Area
Time
Face area
Time
Thickness
Temperature difference
Stanton number
Biot number
Peclet number
Grashoff number
Improve heat transfer
Provide support for tubes
Prevent stagnation of shell side fluid
All of these
Equivalent thickness of film
Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity
Film coefficient × Inside diameter Thermal conductivity
Remain same
Decreases
Increases
May increase or decrease depending upon temperature
Move actually
Do not move actually
Affect the intervening medium
Does not affect the intervening medium
Convection
Radiation
Forced convection
Free convection
The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
The wave length corresponding to the maximum energy is proportional to the absolute temperature
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
None of the above
Watt/cm² °K
Watt/cm4 °K
Watt²/cm °K⁴
Watt/cm² °K⁴
W/m²K
W/m²
W/mK
W/m
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kirchhoff's law
Increases
Decreases
Remain constant
May increase or decrease depending on temperature