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14 Heat Exchangers and Mass Transfer The section contains questions and answers on heat exchanger classification, mean temperature difference, discrete time system implementation, specific heat, heat transfer coefficient, transfer units number and heat exchanger effectiveness...

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44 In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region boundary layer of film exists close to the tube The heat transfer through this film takes place by a convection b radiation c conduction d both convection and conduction e none of the above Ans c...

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#### Fundamentals of Heat and Mass Transfer

In the next section objective type questions are given These are very useful for understanding the basis and resolving misunderstandings In the final section a large number of graded exercise problems involving simple to complex situations are included In the first of the 14 chapters the basic laws for the three modes of heat transfer are...

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3 Temperature higher level questions 2003 Question 12 b Higher Level i What is the difference between heat and temperature? ii The emf of a thermocouple can be used as a thermometric property Explain the underlined terms iii Name a thermometric property other than emf iv Explain why it is necessary to have a standard thermometer...

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Heat Transfer Objective Questions - MCQs 1 Unit of thermal conductivity in MKS units is a kcal/kg m2 176 C b kcal-m/hr m2 176 C c kcal/hr m2 176 C d 300 TOP HEAT TRANSFER Multiple Choice Questions and Answers...

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d mass 39 The force that one surface exerts on another when the two rub against each other is called a gravity b friction c inertia d acceleration 40 What is transferred by a force moving an object through a distance? a motion b force c energy d mass 41 One way to increase acceleration is by...

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Applied Thermodynamics Objective Questions with Answers Pdf Download 101 Addition of heat at constant pressure to a gas results in a raising its temperature b raising its pressure c raising its volume d raising its temperature and doing external work e doing external work Answer d 102 Carnot cycle has maximum efficiency for...

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17-12-2020 0183 32 Ans - C 24 Thermal conductivity of solid substance is more than liquid and gas A True B False Ans - A In this mechanical engineering lecture today we learned about heat transfer subjects Mcq on conduction heat transfer objective questions If you are any problem about heat conduction then comment and subscribe this website...

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equation with no shaft work and no mass flow reduces to the statement that ΣQ for all surfaces = 0 no heat transfer on top or bottom of figure 22 From equation 28 , the heat transfer rate in ,...

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Heat and mass Transfer Unit I November 2008 1 Calculate the rate of heat loss through the vertical walls of a boiler furnace of size 4 m by 3 m by 3 m high The walls are constructed from an inner fire brick wall 25 cm thick of thermal conductivity 04 W/mK, a layer of ceramic blanket insulation of...

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According to Newton s law of cooling, the heat transfer from a hot body to a cold body is Directly proportional to the surface area Directly proportional to the difference of temperatures between the two bodi Either A or B Both A and B Question No 5 When absorptivity α = 1, reflectivity ρ = 0 and transmissivity τ = 0 ,...

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Question No 107 The ratio of the energy absorbed by the body to total energy falling on it is called Absorptive power Emissive power Absorptivity Emissivity Question No 108 The concept of overall coefficient of heat transfer is used in heat transfer problems of Conduction...

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transfer of momentum, heat and mass While Thermodynamics tells us that heat and/ or mass will be transfered as a system moves from one equilibrium state to another, it does not tell us how or how rapidly this transfer will take place because this transfer is inherently a non-equilibrium process...

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09-02-2018 0183 32 a heat transfer b mass transfer c change of temperature d thermodynamic state e change of pressure and volume Ans a 90 For reversible adiabatic process, change in entropy is a maximum b minimum c zero d unpredictable e negative Ans c 91 Isochoric process is one in which a free expansion takes place...

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Convection heat transfer arises when heat is lost/gained by a fluid in contact with a solid surface at a different temperature q hAs TW Ts Watts or conv W s s W s R T T hA T T q 1/ Where s conv hA R 1 Radiation heat transfer is dependent on absolute temperature of surfaces,...

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#### Fundamentals of Mass Transfer in Gas Carburizing

The objective for this work was to develop a fundamental understanding of the mass transfer during gas carburizing process and to develop a strategy for the process control and optimization The research methodology was based on both experimental work and theoretical developments,...