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
A. In heat exchanger design as a safety factor
Different heat contents
Different specific heat
Different atomic structure
Different temperatures
Melting of ice
Boiler furnaces
Condensation of steam in condenser
None of these
Convection
Radiation
Forced convection
Free convection
Conduction
Convection
Radiation
Conduction and convection
Velocity reduction method
Equal friction method
Static regains method
Dual or double method
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
0
0.5
0.75
1
Black radiation
Full radiation
Total radiation
All of these
One dimensional cases only
Two dimensional cases only
Three dimensional cases only
Regular surfaces having non-uniform temperature gradients
Blast furnace
Heating of building
Cooling of parts in furnace
Heat received by a person from fireplace
Function of temperature
Physical property of a substance
Dimensionless parameter
All of these
K cal/kg m² °C
K cal m/hr m² °C
K cal/hr m² °C
K calm/hr °C
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
Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kirchhoff's law
Directly proportional to the 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
Aluminium
Steel
Brass
Copper
6
9
27
81
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
A dimensionless parameter
Function of temperature
Used as mathematical model
A physical property of the material
Higher
Lower
Same
Depends upon the shape of body
Conduction
Convection
Radiation
None of these
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.
Fourier equation
Stefan-Boltzmann equation
Newton Reichmann equation
Joseph-Stefan equation
0.1
0.23
0.42
0.51
First law of thermodynamics
Newton's law of cooling
Newton's law of heating
Stefan's law
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
Watt/mK
Watt/m²K²
Watt/m²K4
Watt/mK²
I.C. engine
Air preheaters
Heating of building in winter
None of the above
S.H/(S.H + L.H)
(S.H + L.H) /S.H
(L.H - S.H)/S.H
S.H/(L.H - S.H)