Nature of body
Temperature of body
Type of surface of body
All of the above
D. All of the above
Stanton number
Biot number
Peclet number
Grashoff number
Is black in colour
Reflects all heat
Transmits all heat radiations
Absorbs heat radiations of all wave lengths falling on it
From one particle of the body to another without the actual motion of the particles
From one particle of the body to another by the actual motion of the heated particles
From a hot body to a cold body, in a straight line, without affecting the intervening medium
None of the above
Temperature
Thickness
Area
Time
Thermal resistance
Thermal coefficient
Temperature gradient
Thermal conductivity
Increase
Decrease
Remain unaffected
May increase/decrease depending on temperature and thickness of insulation
Function of temperature
Physical property of a substance
Dimensionless parameter
All of these
h = k/ ρS
h = ρS/k
h = S/ρk
h = kρ/S
Wien's law
Stefan's law
Kirchhoff's law
Planck's law
Below which a gas does not obey gas laws
Above which a gas may explode
Below which a gas is always liquefied
Above which a gas will never liquefied
Absorptive power
Emissive power
Absorptivity
Emissivity
Hr (time)
Sq. m (area)
°C (temperature)
K.cal (heat)
Increases
Decreases
Remain constant
May increase or decrease depending on temperature
Emissivity
Transmissivity
Reflectivity
Intensity of radiation
W/m²K
W/m²
W/mK
W/m
Higher
Lower
Same
Depends upon the shape of body
Glass
Water
Plastic
Air
6
9
27
81
Conduction
Convection
Radiation
Conduction and convection
More than those for liquids
Less than those for liquids
More than those for solids
Dependent on the viscosity
Increases
Decreases
Remain constant
May increase or decrease depending on temperature
I.C. engine
Air preheaters
Heating of building in winter
None of the above
Directly proportional to the thermal conductivity
Inversely proportional to density of substance
Inversely proportional to specific heat
All of the above
Velocity reduction method
Equal friction method
Static regains method
Dual or double method
Energy transferred by convection to that by conduction
Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
None of the above
Different heat contents
Different specific heat
Different atomic structure
Different temperatures
RN = hl/k
RN = μ cp/k
RN = ρ V l /μ
RN = V²/t.cp
Zeroth law of thermodynamics
First law of thermodynamic
Second law of the thermodynamics
Kirchoff's law
Conduction
Free convection
Forced convection
Radiation
Stanton number
Biot number
Peclet number
Grashoff number