Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kirchhoff's law
C. Second law of thermodynamics
Grey body
Brilliant white polished body
Red hot body
Black body
Irregular surfaces
Nonuniform temperature surfaces
One dimensional cases only
Two dimensional cases only
In heat exchanger design as a safety factor
In case of Newtonian fluids
When a liquid exchanges heat with a gas
None of the above
Absolute temperature
Square of temperature
Fourth power of absolute temperature
Fourth power of temperature
m²/hr
m²/hr °C
kcal/m² hr
kcal/m. hr °C
Directly proportional to thermal conductivity
Inversely proportional to density of substance
Inversely proportional to specific heat
All of the above
Zeroth law of thermodynamics
First law of thermodynamic
Second law of the thermodynamics
Kirchoff's law
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
Higher
Lower
Same
Depends on the area of heat exchanger
Composition
Density
Porosity
All of the above
Conduction
Free convection
Forced convection
Radiation
Emissivity
Transmissivity
Reflectivity
Intensity of radiation
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 = 1 Where a = absorptivity, p = reflectivity, x = transmissivity
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
Directly proportional to the thermal conductivity
Inversely proportional to density of substance
Inversely proportional to specific heat
All of the above
Blast furnace
Heating of building
Cooling of parts in furnace
Heat received by a person from fireplace
Increases
Decreases
Remain constant
May increase or decrease depending on temperature
1 : 1
2 : 1
1 : 2
4 : 1
Absorptive power
Emissive power
Absorptivity
Emissivity
Melting of ice
Boiler furnaces
Condensation of steam in condenser
None of these
Their atoms collide frequently
Their atoms are relatively far apart
They contain free electrons
They have high density
Thermometer
Thermistor
Thermocouple
None of these
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.
Conduction
Convection
Radiation
Conduction and radiation combined
Change vapour into liquid
Change liquid into vapour
Increase the temperature of a liquid or vapour
Convert water into steam and superheat it
k. A. (dT/dx)
k. A. (dx/dT)
k. (dT/dx)
k. (dx/dT)
Temperature
Wave length
Physical nature
All of the above
It is impossible to transfer heat from low temperature source to t high temperature source
Heat transfer by radiation requires no medium
All bodies above absolute zero emit radiation
Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
Move actually
Do not move actually
Affect the intervening medium
Does not affect the intervening medium
Conduction
Convection
Radiation
Conduction and convection