Heat and Mass Transfer An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be 800 mm 40 mm 25 mm 160 mm 800 mm 40 mm 25 mm 160 mm ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Joule sec is the unit of Universal gas constant Thermal conductivity Kinematic viscosity Planck's constant Universal gas constant Thermal conductivity Kinematic viscosity Planck's constant ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A grey body is one whose absorptivity Varies with wavelength of the incident ray Is equal to its emissivity Varies with temperature Does not vary with temperature and. wavelength of the incident ray Varies with wavelength of the incident ray Is equal to its emissivity Varies with temperature Does not vary with temperature and. wavelength of the incident ray ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body) k. (dx/dT) (dT/dx) k. (dT/dx) k. k. (dx/dT) k. (dx/dT) (dT/dx) k. (dT/dx) k. k. (dx/dT) ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as Free convection Conduction Radiation Forced convection Free convection Conduction Radiation Forced convection ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following is a case of steady state heat transfer? Air preheaters Heating of building in winter None of these I.C. engine Air preheaters Heating of building in winter None of these I.C. engine ANSWER DOWNLOAD EXAMIANS APP
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