Cold water inlet and outlet

Hot medium inlet and outlet

Hot medium outlet and cold water inlet

Hot medium outlet and cold water outlet

D. Hot medium outlet and cold water outlet

k/h₀

2k/h₀

h₀/k

h₀/2k

Wien's law

Stefan's law

Kirchhoff's law

Planck's law

Energy transferred by convection to that by conduction

Kinematic viscosity to thermal diffusivity

Inertia force to viscous force

None of the above

Radiators in automobile

Condensers and boilers in steam plants

Condensers and evaporators in refrigeration and air conditioning units

All of the above

Increases

Decreases

Remain constant

May increase or decrease depending on 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

Parallel flow type

Counter flow type

Cross flow type

Regenerator type

Directly proportional to the thermal conductivity

Inversely proportional to density of substance

Inversely proportional to specific heat

All of the above

kcal/m²

kcal/hr °C

kcal/m² hr °C

kcal/m hr °C

Hr (time)

Sq. m (area)

°C (temperature)

K.cal (heat)

-1/3

-2/3

1

-1

Directly proportional to the surface area

Directly proportional to the difference of temperatures between the two bodies

Either (A) or (B)

Both (A) and (B)

Liquids

Energy

Temperature

Entropy

Stanton number

Nusselt number

Biot number

Peclet number

Stanton number

Biot number

Peclet number

Grashoff number

Change vapour into liquid

Change liquid into vapour

Increase the temperature of a liquid of vapour

Convert water into steam and superheat it

One

Two

Three

Four

Equivalent thickness of film

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Film coefficient × Inside diameter Thermal conductivity

K cal/kg m² °C

K cal m/hr m² °C

K cal/hr m² °C

K calm/hr °C

Black radiation

Full radiation

Total radiation

All of these

Q = [2πlk (T₁ - T₂)]/2.3 log (r₂/r₁)

Q = 2.3 log (r₂/r₁)/[2πlk (T₁ - T₂)]

Q = [2π (T₁ - T₂)]/2.3 lk log (r₂/r₁)

Q = = 2πlk/2.3 (T₁ - T₂) log (r₂/r₁)

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

Their atoms collide frequently

Their atoms are relatively far apart

They contain free electrons

They have high density

W/m²K

W/m²

W/mK

W/m

h = k/ ρS

h = ρS/k

h = S/ρk

h = kρ/S

Velocity reduction method

Equal friction method

Static regains method

Dual or double method

Moisture

Density

Temperature

All of the above

Function of temperature

Physical property of a substance

Dimensionless parameter

All of these

Fourier equation

Stefan-Boltzmann equation

Newton Reichmann equation

Joseph-Stefan equation

k₁ k₂

(k₁ + k₂)

(k₁ + k₂)/ k₁ k₂

2 k₁ k₂/ (k₁ + k₂)