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    Showing posts with label GATE 2018. Show all posts
    Showing posts with label GATE 2018. Show all posts

    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

    Wednesday, December 4, 2019

    Most important subjects for GATE Mechanical Engineering

    Most students preparing for higher studies or jobs ask one common question. Which subjects are most important in mechanical engineering? The mechanical curriculum contains many subjects but some of them are basic subjects on which other subjects are based and rely upon it.

    Undergraduate syllabus or curriculum normally contains subjects like
    Machine Design mainly requires knowledge of Strength of Materials because to design of any machine component, we need to look for types of loading, calculation of equivalent forces and stresses. So, before studying Machine Design, we need to have sound knowledge of strength of materials. So, in the curriculum of any mechanical engineering, Strength of Materials/Mechanics of Solids are covered (in the first or second semester) before Machine Design.

    Monday, July 20, 2015

    All you need to know about Thermodynamics Properties

    Thermodynamic Property is a measurable characteristic of the system.
    To get the status of any process of the system, one should have at least two properties at hand. Thus to define the state of a system, we must know the information about different thermodynamics properties. 

    One can classify the general properties in following ways.

    1. Primitive Properties (which are taken from other branches of the science)
    • Pressure, P
    • Velocity, v
    • Volume, V

    2. Basic Thermodynamic Properties (which are defined by the laws of the thermodynamics)
    • Temperature, T (defined by the zeroth law of the Thermodynamics)
    • Internal Energy, U (defined by the first law of the Thermodynamics)
    • Entropy, S (defined by the second law of the Thermodynamics)
    3. Derived Thermodynamics Properties (Combination of various other properties defined earlier)
    • Enthalpy ( U + P.V)
    • Gibbs Energy (U + PV-TS)
    • Specific Heat at Constant Pressure, Cp
    • Specific Heat at Constant Volume, Cv

    Saturday, June 29, 2013