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    Showing posts with label How to ?. Show all posts
    Showing posts with label How to ?. Show all posts

    Monday, October 16, 2017

    What would happen if compressor is removed from the refrigerator?

    Simply, the refrigerator would STOP! but why?

    To answer this question, one needs to know the Second law of thermodynamics (Clausius Statement) which states "It is impossible to construct a heat pump which continuously takes away the heat from low-temperature region to high-temperature region without taking any external work". 

    Here, the heat pump is our refrigerator which keeps on throwing heat from low-temperature environment to room temperature. As per the above statement, external work is must to run the refrigerator. That external work is represented by "Compressor".

    Friday, March 17, 2017

    How to write an 'abstract' for technical report or article or paper?

    If you are an engineer and working in industry or academics, you need to submit a technical report or research papers to express the findings and work of stuff.

    An abstract is an important element of any technical report or any research paper/article. It is something that people normally prefer to read before taking a look at the whole article. The abstract must contain enough information that highlights and give the complete essence of the article. 

    Normally abstract should deliver objectives of the research, methods that one has used for research, key results obtained and a clear and concise conclusion. 

    The abstract should contain a minimum 100 to 200 words. The content of the abstract should be clear and concise. 

    Friday, January 8, 2016

    How to choose final year project topic in any branch of engineering ?

    This article is all about choosing the right final year project topic in mechanical engineering. Watch the complete video to get the idea of the final year project topic.

    Wednesday, September 23, 2015

    How to change dimension text height and arrow size in AutoCAD 2015 ?

    If you using AutoCAD and want to change the text height and arrow size for drawing, view this video.

    Wednesday, July 22, 2015

    How to select object in AutoCAD 2015 with two options?

    The latest version of AutoCAD comes with two options to select the drawing. View this video to know it.


    Sunday, February 22, 2015

    What will be the change in room temperature if door of refrigerator kept open?

    What will be the change in room temperature if the door of the refrigerator kept open? This question is often asked at a mechanical engineering job interview and also in engineering examination.

    Ans: NO, Rather, the temperature of the room will increase over time, not instantly.


    To understand this, let us first understand the working of the domestic refrigerator. It contains four different equipment namely compressor, condenser, capillary tube and evaporator and it also has refrigerant or working fluid/medium which continuously circulating through all these four different equipment to enable heat transfer and thus cooling. The refrigerant while passing through different parts, changes phase and this enable cooling in a domestic refrigerator.

    Monday, January 27, 2014

    How to create animation in AutoCAD software?

    In the Mechanical Engineering curriculum, the student needs to understand many mechanisms like piston-slider mechanism, slider-crank or four-bar chain mechanism. This mechanism can be better understood by the use of animations. There are many options available to create an animation like the use of flash software, PowerPoint presentations. But animation creation in AutoCAD can be beneficial for a mechanical engineer by the use of 'mslide' and 'script' command.

    Thursday, November 1, 2012

    Tips/How to write technical/engineering report/document

    Follow the following details during making/writing technical reports.

    Always choose (most of the time) Times New Roman as font type with font size 16,14,12.
    Where 16 font size is for chapter/experiment name, 14 is for the main heading and 12 for the content text of the document.

    Always use 'Equation editor' or any equation maker software to write each equation of technical writing. Copy and paste that equation in the report. Always make sure where to put superscript and subscript in the equation. Give the equation number as per chapter name. e.g. 5th equation of the 4th chapter should be given equation number as (4.5). For Microsoft Word, go to Insert - Object - Microsoft Equation 3.0

    Thursday, May 17, 2012

    How to operate Vacuum Pump and Working of Liquid Nitrogen Plant

    Want to know about "How to operate Vacuum Pump and Working of Liquid Nitrogen Plant"?

    Please have a look at this links

    1. How to operate Vacuum Pump

    Vacuum requirements are one of the critical factors that affect the cryogenics temperature. Without Vacuum, no cryogenics systems survive. Look at Pulse Tube Cryocooler and related Cryocooler, which always requires a vacuum to keep resists atmospheric temperature and minimize conduction and convection losses because Vacuum is having no medium and heat transfer requires medium except radiation heat transfer.
    Once you have a Vacuum pump but it is not sufficient, you need to know how to operate it. Visit URL as under:

    Friday, May 11, 2012

    How to operate Helium Leak Detection System?

    Importance of Helium and why it is necessary to detect the leak of Helium?

    Helium is a very rare gas found from the earth and it is believed that it is going to be depleted in 2030. So, It is our duty as cryogenics engineering people to save helium as possible as we can. We need to look for the leak from the cryogenics system which involves the use of helium as a working gas.

    A leak from the system also causes poor vacuum conditions. So, we need to rectify that leakage and try to save helium. Normally any pressurized Helium gas system is not 100 % leak-proof and one's aim is to detect this leak as early as possible and try to solve this.

    How to Operate a Helium Leak Detection System?

    Here is a standard procedure to use Helium Leak Detection System.

    The helium leak detection system consists of a turbo molecular pump which helps us to detect the helium gas leaking from the system. The connector is the place where the sniffer probe is attached with proper cable and is directed to leaking point at the system and this probe detects the leaking helium in millibar per second rate.