Heat Transfer In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred By direct contact of hot flue gas with air Through a metallic wall By heating an intermediate material (like chequor bricks) and then heating the air from this hot material None of these By direct contact of hot flue gas with air Through a metallic wall By heating an intermediate material (like chequor bricks) and then heating the air from this hot material None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is 0.1 < 1 >1 L 0.1 < 1 >1 L ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In the equation Q = UAΔt; Δt is Logarithmic mean temperature difference The difference of average bulk temperatures of hot and cold fluids Arithmetic mean temperature difference Geometric mean temperature difference Logarithmic mean temperature difference The difference of average bulk temperatures of hot and cold fluids Arithmetic mean temperature difference Geometric mean temperature difference ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Sensible heat of hot industrial flue gases can not be recovered by a/an Regenerator Economiser Ceramic recuperator None of these Regenerator Economiser Ceramic recuperator None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second. 10 20 30 1 10 20 30 1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The main purpose of providing fins on heat transfer surface is to increase the Temperature gradient Mechanical strength of the equipment Heat transfer area Heat transfer co-efficient Temperature gradient Mechanical strength of the equipment Heat transfer area Heat transfer co-efficient ANSWER DOWNLOAD EXAMIANS APP
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