Wien's law
Stefan's law
Kirchhoff's law
Planck's law
C. Kirchhoff's law
Its temperature
Nature of the body
Kind and extent of its surface
All of the above
Universal gas constant
Kinematic viscosity
Thermal conductivity
Planck's constant
h = k/ ρS
h = ρS/k
h = S/ρk
h = kρ/S
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
First law of thermodynamics
Newton's law of cooling
Newton's law of heating
Stefan's law
Temperature
Thickness
Area
Time
Conduction
Convection
Radiation
Conduction and convection
Convection
Radiation
Forced convection
Free convection
Different heat contents
Different specific heat
Different atomic structure
Different temperatures
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
At all temperatures
At one particular temperature
When system is under thermal equilibrium
At critical temperature
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
Conduction
Convection
Radiation
Conduction and radiation combined
6
9
27
81
Grashoff number
Nusselt number
Weber number
Prandtl number
Nature of the body
Temperature of the body
Type of surface of the body
All of these
Aluminium
Steel
Brass
Copper
Kirchoffs law
Stefan's law
Wien' law
Planck's law
Kirchhoff's law
Stefan's law
Wines law
Planck's law
0.002
0.02
0.01
0.1
Conduction
Convection
Radiation
Conduction and convection
P = 0, x = 0 and a = 1
P=1, x = 0 and a = 0
P = 0, x = 1 and a = 0
X = 0, a + p = 1 Where a = absorptivity, p = reflectivity, X = transmissivity.
-1/3
-2/3
1
-1
Energy transferred by convection to that by conduction
Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
None of the above
High thickness of insulation
High vapour pressure
Less thermal conductivity insulator
A vapour seal
Minimum energy
Maximum energy
Both (A) and (B)
None of these
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
More than those for liquids
Less than those for liquids
More than those for solids
Dependent on the viscosity
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
Same
Less
Greater
None of these