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
C. More than those for liquids and gases
Q = [2πlk (T₁ - T₂)]/2.3 log (r₂/r₁)
Q = 2.3 log (r₂/r₁)/[2πlk (T₁ - T₂)]
Q = [2π (T₁ - T₂)]/2.3 lk log (r₂/r₁)
Q = = 2πlk/2.3 (T₁ - T₂) log (r₂/r₁)
Absolute temperature
Square of the absolute temperature
Cube of the absolute temperature
Fourth power of the absolute temperature
Maximum
Minimum
Zero
None of these
P = 0, x = 0 and a = 1
P=1, x = 0, and a = 0
P = 0, T= 1, and a = 0
X = 0, a + p = 1
Energy transferred by convection to that by conduction
Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
None of the above
Electric heater
Steam condenser
Boiler
Refrigerator condenser coils
Wien's law
Planck's law
Stefan's law
Fourier's law
Conduction
Convection
Radiation
Conduction and convection
Function of temperature
Physical property of a substance
Dimensionless parameter
All of these
Absolute temperature
Square of temperature
Fourth power of absolute temperature
Fourth power of temperature
The better insulation must be put inside
The better insulation must be put outside
One could place either insulation on either side
One should take into account the steam temperature before deciding as to which insulation is put where
Stanton number
Biot number
Peclet number
Grashoff number
Moisture
Density
Temperature
All of the above
Conduction
Convection
Radiation
Conduction and convection
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
Velocity reduction method
Equal friction method
Static regains method
Dual or double method
0.1
0.23
0.42
0.51
P = 0, x = 0 and a = 1
P= 1, T = 0 and a = 0
P = 0, x = 1 and a = 0
X = 0, a + p = 0 Where a = absorptivity, p = reflectivity, X = transmissivity.
Fourier equation
Stefan-Boltzmann equation
Newton Reichmann equation
Joseph-Stefan equation
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
m²/hr
m²/hr °C
kcal/m² hr
kcal/m. hr °C
Universal gas constant
Kinematic viscosity
Thermal conductivity
Planck's constant
Change vapour into liquid
Change liquid into vapour
Increase the temperature of a liquid of vapour
Convert water into steam and superheat it
One dimensional cases only
Two dimensional cases only
Three dimensional cases only
Regular surfaces having non-uniform temperature gradients
Cold water inlet and outlet
Hot medium inlet and outlet
Hot medium outlet and cold water inlet
Hot medium outlet and cold water outlet
Kirchhoff's law
Stefan's law
Wines law
Planck's law
W/m²K
W/m²
W/mK
W/m
Liquids
Energy
Temperature
Entropy
-1/3
-2/3
1
-1
Higher
Lower
Same
Depends upon the shape of body