According to Stefan's law, the total radiation from a black body per second per unit area is proportional to Absolute temperature T5 T T2 TRUE ANSWER : ? YOUR ANSWER : ?
The heat is transferred by conduction, convection and radiation in Condensation of steam in condenser None of these Melting of ice Boiler furnaces TRUE ANSWER : ? YOUR ANSWER : ?
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is Both (A) and (B) Directly proportional to the difference of temperatures between the two bodies Directly proportional to the surface area Either (A) or (B) TRUE ANSWER : ? YOUR ANSWER : ?
In case of liquids and gases, the heat transfer takes place according to Convection None of these Radiation Conduction TRUE ANSWER : ? YOUR ANSWER : ?
The automobile radiator is a heat exchanger of Cross flow type Regenerator type Parallel flow type Counter flow type TRUE ANSWER : ? YOUR ANSWER : ?
In regenerator type heat exchanger, heat transfer takes place by Direct mixing of hot and cold fluids Generation of heat again and again A complete separation between hot and cold fluids Flow of hot and cold fluids alternately over a surface TRUE ANSWER : ? YOUR ANSWER : ?
Fourier's law of heat conduction gives the heat flow for One dimensional cases only Irregular surfaces Nonuniform temperature surfaces Two dimensional cases only TRUE ANSWER : ? YOUR ANSWER : ?
The thermal diffusivities for solids are generally More or less same as for liquids and gases More than those for liquids and gases Less than those for liquids Less than those for gases TRUE ANSWER : ? YOUR ANSWER : ?
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as None of these Thermal resistance Thermal conductivity Thermal coefficient TRUE ANSWER : ? YOUR ANSWER : ?
According to Wien's law, the wavelength corresponding to maximum energy is proportion to T Absolute temperature (T) F I² TRUE ANSWER : ? YOUR ANSWER : ?