Heat Transfer The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by (εx + εy)/(εx + εy - εx . εy) Εx + εy 1/εx + 1/εy Εx . εy (εx + εy)/(εx + εy - εx . εy) Εx + εy 1/εx + 1/εy Εx . εy ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer At constant temperature, the thermal conductivities of gases __________ with rise in pressure. May increase or decrease; depends on the pressure Increase Decrease Remain unchanged May increase or decrease; depends on the pressure Increase Decrease Remain unchanged ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In pipe flow, heat is transferred from hot wall to the liquid by Forced convection only Conduction only Forced convection and conduction Free and forced convection Forced convection only Conduction only Forced convection and conduction Free and forced convection ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Solid angle subtended by the finite surface at the radiating element is proportional to the square of the distance between surfaces expressed in terms of radians called the view factor. called the angle of vision proportional to the square of the distance between surfaces expressed in terms of radians called the view factor. called the angle of vision ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator? Long vertical evaporator Horizontal tube evaporator Calenderia vertical tube evaporator Agitated film evaporator Long vertical evaporator Horizontal tube evaporator Calenderia vertical tube evaporator Agitated film evaporator ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Viscosity of gases __________ with increase in temperature. Decrease slowly Remain unaffected Increase very rapidly Increase slowly Decrease slowly Remain unaffected Increase very rapidly Increase slowly ANSWER DOWNLOAD EXAMIANS APP
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