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            Wednesday, March 4, 2020

            GATE Mechanical Engineering Preparation and free study material

            Today, most of the public sector units choose the GATE score for entry-level. One has to rely completely on the GATE score to get through the stage of the personal interview.

            Normally GATE exam consists of those questions which are mostly related to research to be done at Master Level i.e. M.Tech or M. E. level. So, It is very necessary to get ready for the preparation of those subjects on which complete M. Tech or M. E. is based. In the case of Mechanical Engineering, One should prepare the following most important subjects.

            1. Mechanics of Solids or (Engineering Mechanics + Strength of Materials) which is base on any motion and design-related research.

            2. Thermal engineering which includes Fluid Mechanics which is the most important subject for thermal engineering specialization in M. Tech or M. E. Second is thermodynamics, Heat and mass transfer and Refrigeration, and Air conditioning. One can find numerous applications of fluid mechanics like fountains, fire brigade works, hydro-power station and many more.

            Friday, February 14, 2020

            Difference between 'Thermodynamics' and 'Heat Transfer'

            Thermodynamics and Heat Transfer both are part of thermal engineering and each one has its own meaning and importance. Both deal with heat and energy then, one might ask, what is the real difference between the two subjects? i.e. Thermodynamics and Heat Transfer

            "Thermodynamics" deals with the amount of energy in the form of heat or work during a process and only considers the end states in equilibrium. It will not give information about how long it will take to reach to the final state in equilibrium. While

            "Heat Transfer" deals with the rate of energy transfer thus, it gives an idea of how long a heat transfer will occur? Heat transfer deals with time and nonequilibrium phenomena. Heat can only transfer when there is a temperature gradient that exists in a body and which is an indication of nonequilibrium phenomena.

            In short, Thermodynamics gives "Why"  a process will occur and Heat Transfer will tell, "How" a process will occur when there is a concern about the transfer of heat.

            To support all these arguments, Thermodynamics uses the following laws,

            • Zeroth Law of Thermodynamics (defines temperature)
            • The first law of Thermodynamics (defines internal energy)
            • Second Law of Thermodynamics (defines entropy)
            • Third Law of Thermodynamics (limits the lowest temperature attainable)

            While Heat Transfer uses,

            • Fourier's Law (Heat conduction)
            • Newtons Law of Cooling (Heat convection)
            • Planck's Law (Thermal Radiation)
            • Stephan Boltzman's Law (Thermal Radiation)
            • Wein's Law (Thermal Radiation)
            • Kirchoff's Law (Thermal Radiation)
            • Lambert's Law (Thermal Radiation)
            Learn more about such important questions to be asked in Mechanical Engineering Interview

            Thursday, February 13, 2020

            Objective questions in mechanical engineering (Thermal Engineering) for competitive exams

            Choose the right answer:

            1. One metre (1 m) of water column  is equivalent to 
            (A) 0.1 kN per square meter
            (B) 1.0 kN per square meter
            (C) 10 kN per square meter
            (D) 100 kN per square meter

            Thursday, January 23, 2020

            Importance of 'flash-point' and 'fire-point'

            In many engineering applications, fuels are used for getting thermal energy by combustion of fuel. For example, an oil-fired furnace, oil is ignited and heat is used for heating the metals to alter their properties.

            Fuel selection is also one of the most important parts. One needs to use and select fuel based on its properties like calorific value, density, viscosity, specific heat, and flash/fire point. Now, what is the meaning of a flashpoint and fire point?

             'Flash Point is temperature and the property of a volatile lubricant/fuel which suggests when volatile lubricant/fuel gives off sufficient vapor when heated, it will start to ignite for a moment but not lasts more than few seconds.

             'Flash Point' requires ignition source whereas 'auto-ignition temperature' does not require a source of heat. While 'Flash Point' depends on the vapor pressure of that lubricant/fuel and it increases as the temperature of fuel/lubricant increases. Flashpoint and fire point can be determined experimentally by use of Cleveland's open apparatus and Abel's closed cup apparatus. 

            Tuesday, January 7, 2020

            Calorific value and its types (Higher calorific value and lower calorific value)

            Any fuel that is to be used in any combustion process first, be checked by its calorific values. The cost of fuel is also affected by the calorific value of the fuel. Here you can find the basic information about the calorific value and its type. 

            What is combustion?

            Sunday, December 15, 2019

            Free e-books for mechanical engineering subjects

            This article aims at sharing free e-books for mechanical engineering subjects. You can ask for any book that is listed below.