Heat Transfer Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second. 3 x l08 3 x l010 3 x l012 3 x l05 3 x l08 3 x l010 3 x l012 3 x l05 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by Natural convection Forced convection Steady state conduction Transient conduction Natural convection Forced convection Steady state conduction Transient conduction ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat transfer rate described by Fourier's law will decrease, if the __________ increases. Temperature difference Heat transfer area Thermal conductivity Thickness Temperature difference Heat transfer area Thermal conductivity Thickness ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following has the minimum absorptivity? Refractory bricks Coal dust Aluminium foil Iron plates Refractory bricks Coal dust Aluminium foil Iron plates ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large. 40 minutes 10 minutes 20 minutes 5 minutes 40 minutes 10 minutes 20 minutes 5 minutes ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer. Grashoff Prandtl & Grashoff Both A & B Reynolds Grashoff Prandtl & Grashoff Both A & B Reynolds ANSWER DOWNLOAD EXAMIANS APP
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