Heat Transfer Heat transfer occurs by natural convection because change in temperature causes difference in Density Thermal conductivity Viscosity Heat capacity Density Thermal conductivity Viscosity Heat capacity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place From one part of a body to the another part of the same body Both B & C Between two bodies not in physical contact with each other Between two bodies in physical contact with each other From one part of a body to the another part of the same body Both B & C Between two bodies not in physical contact with each other Between two bodies in physical contact with each other ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer At constant temperature, the thermal conductivities of gases __________ with rise in pressure. Decrease May increase or decrease; depends on the pressure Remain unchanged Increase Decrease May increase or decrease; depends on the pressure Remain unchanged Increase ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Boiling point elevation of an ideal solution Decreases rapidly with temperature rise Increases rapidly with temperature rise Both B and C In independent of pressure Decreases rapidly with temperature rise Increases rapidly with temperature rise Both B and C In independent of pressure ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. Decreases May increase or decrease ; depends on the material Remains constant Increases Decreases May increase or decrease ; depends on the material Remains constant Increases ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Harmonic mean temperature difference is given by (ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂) 2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂) 2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂) √(ΔT₁ . ΔT₂) (ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂) 2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂) 2.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂) √(ΔT₁ . ΔT₂) ANSWER DOWNLOAD EXAMIANS APP
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