The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is Less than one Equal to Nusselt number Greater than one Equal to one TRUE ANSWER : ? YOUR ANSWER : ?
The most commonly used method for the design of duct size is the Velocity reduction method Dual or double method Static regains method Equal friction method TRUE ANSWER : ? YOUR ANSWER : ?
According to Wien's law, the wavelength corresponding to maximum energy is proportion to T I² Absolute temperature (T) F TRUE ANSWER : ? YOUR ANSWER : ?
Temperature of steam at around 540°C can be measured by Thermocouple Thermistor None of these Thermometer TRUE ANSWER : ? YOUR ANSWER : ?
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as Conduction Free convection Forced convection Radiation TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following property of air does not increase with rise in temperature? Thermal conductivity Density Dynamic viscosity Thermal diffusivity TRUE ANSWER : ? YOUR ANSWER : ?
Heat transfer in liquid and gases takes place by Convection Conduction and convection Radiation Conduction TRUE ANSWER : ? YOUR ANSWER : ?
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by Both convection and conduction Conduction Radiation Convection 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 : ?
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is 1/h₁ + 1/h₂ + 1/h₃ h₁ + h₂ + h₃ None of these (h₁.h₂.h₃)1/3 TRUE ANSWER : ? YOUR ANSWER : ?