Heat and Mass Transfer When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a Black body White body Opaque body Grey body Black body White body Opaque body Grey body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The automobile radiator is a heat exchanger of Regenerator type Cross flow type Parallel flow type Counter flow type Regenerator type Cross flow type Parallel flow type Counter flow type ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In a shell and tube heat exchanger, baffles are provided on the shell side to Improve heat transfer Prevent stagnation of shell side fluid Provide support for tubes All of these Improve heat transfer Prevent stagnation of shell side fluid Provide support for tubes All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be One Four Two Three One Four Two Three ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be k₁ k₂ 2 k₁ k₂/ (k₁ + k₂) (k₁ + k₂) (k₁ + k₂)/ k₁ k₂ k₁ k₂ 2 k₁ k₂/ (k₁ + k₂) (k₁ + k₂) (k₁ + k₂)/ k₁ k₂ ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In regenerator type heat exchanger, heat transfer takes place by Generation of heat again and again A complete separation between hot and cold fluids Flow of hot and cold fluids alternately over a surface 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 Direct mixing of hot and cold fluids ANSWER DOWNLOAD EXAMIANS APP
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