Heat Transfer Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid when Grashhoff number is very important for fluids in tubulent flow none of the listed here for fluids in laminar flow when Grashhoff number is very important for fluids in tubulent flow none of the listed here for fluids in laminar flow ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of a vertical tube evaporator, with increase in the liquor level, the True temperature drop increases Both B and C Capacity of the evaporator is increased Capacity of the evaporator is decreased True temperature drop increases Both B and C Capacity of the evaporator is increased Capacity of the evaporator is decreased ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer. Both A & B Prandtl & Grashoff Grashoff Reynolds Both A & B Prandtl & Grashoff Grashoff Reynolds ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer With increase in temperature, the total emissivity of conductors Decreases linearly Increases Remains same Decreases Decreases linearly Increases Remains same Decreases ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube Graetz number > 100 Exit-fluid temperature > wall temperature Exit fluid temperature < wall temperature Exit fluid temperature = wall temperature Graetz number > 100 Exit-fluid temperature > wall temperature Exit fluid temperature < wall temperature Exit fluid temperature = wall temperature ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger? Effective tube surface area for convective heat transfer Tube side pressure drop and the heat transfer rate All of these Convective heat transfer co-efficient Effective tube surface area for convective heat transfer Tube side pressure drop and the heat transfer rate All of these Convective heat transfer co-efficient ANSWER DOWNLOAD EXAMIANS APP
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