A dimensionless parameter

Function of temperature

Used as mathematical model

A physical property of the material

D. A physical property of the material

Grashoff number

Nusselt number

Weber number

Prandtl number

Thermal coefficient

Thermal resistance

Thermal conductivity

None of these

Hr (time)

Sq. m (area)

°C (temperature)

K.cal (heat)

Equal to one

Greater than one

Less than one

Equal to Nusselt number

S.H/(S.H + L.H)

(S.H + L.H) /S.H

(L.H - S.H)/S.H

S.H/(L.H - S.H)

Stanton number

Nusselt number

Biot number

Peclet number

Density

Coefficient of viscosity

Gravitational force

All of these

Varies with temperature

Varies with wavelength of the incident ray

Is equal to its emissivity

Does not vary with temperature and. wavelength of the incident ray

I.C. engine

Air preheaters

Heating of building in winter

None of the above

Absolute temperature

Square of temperature

Fourth power of absolute temperature

Fourth power of temperature

Nature of the body

Temperature of the body

Type of surface of the body

All of these

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

Thermal conductivity to the equivalent thickness of the film of fluid

Temperature drop through the films of fluids to the thickness of film of fluids

Thickness of film of fluid to the thermal conductivity

Thickness of film of fluid to the temperature drop through the films of fluids

Moisture

Density

Temperature

All of the above

Absolute temperature

Square of the absolute temperature

Cube of the absolute temperature

Fourth power of the absolute temperature

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

Conduction

Convection

Radiation

None of these

Conduction

Convection

Radiation

Conduction and convection

Stanton number

Biot number

Peclet number

Grashoff number

One dimensional cases only

Two dimensional cases only

Three dimensional cases only

Regular surfaces having non-uniform temperature gradients

Conduction

Convection

Radiation

Conduction and radiation combined

Minimum energy

Maximum energy

Both (A) and (B)

None of these

Change vapour into liquid

Change liquid into vapour

Increase the temperature of a liquid or vapour

Convert water into steam and superheat it

Conduction

Convection

Radiation

None of these

0.1

0.3

0.7

1.7

0.45

0.55

0.40

0.75

Higher

Lower

Same

Depends upon the shape of body

Cold body to hot body

Hot body to cold body

Smaller body to larger body

Larger body to smaller body

Parallel flow

Counter flow

Cross flow

All of these