Heat and Mass Transfer Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in Steam condenser Electric heater Refrigerator condenser coils Boiler Steam condenser Electric heater Refrigerator condenser coils Boiler ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The heat transfer by conduction through a thick sphere is given by Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1) ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The energy distribution of an ideal reflector at higher temperatures is largely in the range of Remain same at all wavelengths Shorter wavelength Wavelength has nothing to do with it Longer wavelength Remain same at all wavelengths Shorter wavelength Wavelength has nothing to do with it Longer wavelength ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called Emissivity None of these Emissive power Absorptive power Emissivity None of these Emissive power Absorptive power ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Fourier's law of heat conduction gives the heat flow for Two dimensional cases only Irregular surfaces One dimensional cases only Nonuniform temperature surfaces Two dimensional cases only Irregular surfaces One dimensional cases only Nonuniform temperature surfaces ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called Conduction Radiation None of these Convection Conduction Radiation None of these Convection ANSWER DOWNLOAD EXAMIANS APP
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