K cal/kg m² °C
K cal m/hr m² °C
K cal/hr m² °C
K calm/hr °C
B. K cal m/hr m² °C
Grey body
Brilliant white polished body
Red hot body
Black body
Cold body to hot body
Hot body to cold body
Smaller body to larger body
Larger body to smaller body
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
Change vapour into liquid
Change liquid into vapour
Increase the temperature of a liquid of vapour
Convert water into steam and superheat it
Zeroth law of thermodynamics
First law of thermodynamic
Second law of the thermodynamics
Kirchoff's law
Grashoff number
Biot number
Stanton number
Prandtl number
Radiators in automobile
Condensers and boilers in steam plants
Condensers and evaporators in refrigeration and air conditioning units
All of the above
Blast furnace
Heating of building
Cooling of parts in furnace
Heat received by a person from fireplace
Better insulation should be put over pipe and better one over it
Inferior insulation should be put over pipe and better one over it
Both may be put in any order
Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Emissivity
Transmissivity
Reflectivity
Intensity of radiation
Temperature
Thickness
Area
Time
Stanton number
Biot number
Peclet number
Grashoff number
Directly proportional to the thermal conductivity
Inversely proportional to density of substance
Inversely proportional to specific heat
All of the above
The time taken to attain the final temperature to be measured
The time taken to attain 50% of the value of initial temperature difference
The time taken to attain 63.2% of the value of initial temperature difference
Determined by the time taken to reach 100°C from 0°C
Black body
Grey body
Opaque body
White body
Increases
Decreases
Remain constant
May increase or decrease depending on temperature
Black bodies
Polished bodies
All coloured bodies
All of the above
Electric heater
Steam condenser
Boiler
Refrigerator condenser coils
25 mm
40 mm
160 mm
800 mm
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.
20°C
40°C
60°C
66.7°C
Domestic refrigerators
Water coolers
Room air conditioners
All of these
0.45
0.55
0.40
0.75
Conduction
Convection
Radiation
Conduction and convection
Change vapour into liquid
Change liquid into vapour
Increase the temperature of a liquid or vapour
Convert water into steam and superheat it
Quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1°C
Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C
Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
All of the above
Watt/cm² °K
Watt/cm4 °K
Watt²/cm °K⁴
Watt/cm² °K⁴
Nature of body
Temperature of body
Type of surface of body
All of the above
tm = (Δt1 - Δt2)/ loge (Δt1/Δt2)
tm = loge (Δt1/Δt2)/ (Δt1 - Δt2)
tm = tm = (Δt1 - Δt2) loge (Δt1/Δt2)
tm = loge (Δt1 - Δt2)/ Δt1/Δt2
h₁ + h₂ + h₃
(h₁.h₂.h₃)1/3
1/h₁ + 1/h₂ + 1/h₃
None of these