Nature of the body

Temperature of the body

Type of surface of the body

All of these

D. All of these

k. A. (dT/dx)

k. A. (dx/dT)

k. (dT/dx)

k. (dx/dT)

One

Two

Three

Four

Melting of ice

Boiler furnaces

Condensation of steam in condenser

None of these

Pb = pa - pv

Pb = pa + pv

Pb = pa × pv

Pb = pa/pv

Is black in colour

Reflects all heat

Transmits all heat radiations

Absorbs heat radiations of all wave lengths falling on it

Below which a gas does not obey gas laws

Above which a gas may explode

Below which a gas is always liquefied

Above which a gas will never liquefied

25 mm

40 mm

160 mm

800 mm

Iron

Lead

Concrete

Wood

Minimum energy

Maximum energy

Both (A) and (B)

None of these

Solids

Liquids

Gases

None of these

Change vapour into liquid

Change liquid into vapour

Increase the temperature of a liquid of vapour

Convert water into steam and superheat it

Fourier equation

Stefan-Boltzmann equation

Newton Reichmann equation

Joseph-Stefan equation

Grashoff number and Reynold number

Grashoff number and Prandtl number

Prandtl number and Reynold number

Grashoff number, Prandtl number and Reynold number

Liquids

Energy

Temperature

Entropy

It is impossible to transfer heat from low temperature source to t high temperature source

Heat transfer by radiation requires no medium

All bodies above absolute zero emit radiation

Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

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

W/m²K

W/m²

W/mK

W/m

Temperature

Wave length

Physical nature

All of the above

Stanton number

Nusselt number

Biot number

Peclet number

Convection

Radiation

Forced convection

Free convection

Velocity reduction method

Equal friction method

Static regains method

Dual or double method

kcal/m²

kcal/hr °C

kcal/m² hr °C

kcal/m hr °C

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

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.

Cold water inlet and outlet

Hot medium inlet and outlet

Hot medium outlet and cold water inlet

Hot medium outlet and cold water outlet

More than those for liquids

Less than those for liquids

More than those for solids

Dependent on the viscosity

Thermometer

Thermistor

Thermocouple

None of these

Conduction

Free convection

Forced convection

Radiation

Conduction

Convection

Radiation

Conduction and convection

Absolute temperature

Square of the absolute temperature

Cube of the absolute temperature

Fourth power of the absolute temperature