Grashoff number
Biot number
Stanton number
Prandtl number
B. Biot number
-1/3
-2/3
1
-1
Conduction
Convection
Radiation
None of these
Black body
Grey body
Opaque body
White body
Thermal conductivity
Thermal diffusivity
Density
Dynamic viscosity
Wien's law
Stefan's law
Kirchhoff's 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
Directly proportional to the surface area of the body
Directly proportional to the temperature difference on the two faces of the body
Dependent upon the material of the body
All of the above
More than those for liquids
Less than those for liquids
More than those for solids
Dependent on the viscosity
h = k/ ρS
h = ρS/k
h = S/ρk
h = kρ/S
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
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
First law of thermodynamics
Newton's law of cooling
Newton's law of heating
Stefan's law
Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
Both the fluids at inlet are in their hottest state
Both the fluids at exit are in their hottest state
One fluid is in hottest state and other in coldest state at inlet
A.Cmin/U
U/A.Cmin
A.U.Cmin
A.U/Cmin
Shorter wavelength
Longer wavelength
Remain same at all wavelengths
Wavelength has nothing to do with it
Conduction
Free convection
Forced convection
Radiation
RN = hl/k
RN = μ cp/k
RN = ρ V l /μ
RN = V²/t.cp
Different heat contents
Different specific heat
Different atomic structure
Different temperatures
Black bodies
Polished bodies
All coloured bodies
All of the above
Blast furnace
Heating of building
Cooling of parts in furnace
Heat received by a person from fireplace
Kirchoffs law
Stefan's law
Wien' law
Planck's law
kcal/m²
kcal/hr °C
kcal/m² hr °C
kcal/m hr °C
S.H/(S.H + L.H)
(S.H + L.H) /S.H
(L.H - S.H)/S.H
S.H/(L.H - S.H)
At all temperatures
At one particular temperature
When system is under thermal equilibrium
At critical temperature
0
0.5
0.75
1
Is black in colour
Reflects all heat
Transmits all heat radiations
Absorbs heat radiations of all wave lengths falling on it
Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)
Zeroth law of thermodynamics
First law of thermodynamic
Second law of the thermodynamics
Kirchoff's law
Absorptive power
Emissive power
Absorptivity
Emissivity
Quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C
Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
All of the above