Answered Questions

  • What is the exact difference between Refrigerator and a air conditioner ?


    • Aug 4th, 2017

    Refrigerator is confined to small enclosure, it just maintains the temperature below the room temperature whereas air conditioner is confined to room. It can be used to cool the air, heat, humidify, dehumidify etc.


    • Jul 13th, 2017

    Refrigeration: is referred to cooling of required space using various processes. Most of the refrigeration involves “Vapor Compression Refrigeration Process” which involves following steps which i...

  • what is the procedure to operate a pump ?

    nasser khattab

    • Nov 8th, 2015

    Procedure to operate a pump open inlet valve but for outlet valve (open or close) changes due to pump type. If it is a centrifugal pump then close outlet valve and after run then open it slowly. If it is a displacement pump open outlet valve before run the pump.


    • Sep 6th, 2015

    Check suction valve and discharge valve are open then check oil level and start the pump switch.

  • Fluid Mechanics

    What is diffrence between Impeller and Propeller?

    Vivek K

    • Jun 17th, 2014

    Impeller has blades in which the blade angle can be varied.
    propeller has fixed blade angles.

    احمد امام

    • Dec 8th, 2013

    An impeller is used to suck air into something, such as a turbocharger or a vacuum cleaner.

    A propeller is used for propulsion, such as on an airplane or a boat.

  • Heat Exchanger

    What is heat exchanger? What is the use of it?


    • Dec 19th, 2010

    A heat exchanger (HX) is a mechanical equipment used for exchanging heat, e.g. between two mediums i.e fluids.Its classified in two groups;1. Direct Contact HX2. Indirect Contact HXDirect Contact HX i...

  • Thermodynamics

    Why condenser is needed in steam power plant?


    • Oct 22nd, 2017

    To decrease the temperature and comes to its original temperature before its inlet in turbine. If its temperature is not decreased its efficiency gets low, so finally condenser is used to increase the efficiency.


    • Oct 22nd, 2017

    Thermodynamics is a process in which energy is transferred in the form of work and head in equilibrium condition.

  • Priming

    What is Priming?


    • Dec 20th, 2010

    Priming is the process of filling water in centrifugal pump suction strainer to casing upto the delivery valve or priming point. It will remove the air from the suction side of the pump. In centrifug...

  • Boiler Feed Pumps

    Why are the stages being provided in Boiler Feed Pump?


    • Dec 20th, 2010

    Boiler feed pump is a multi-stage centrifugal pump where no of impellers more than one usually >3 . Depending upon the boiler working pressure pump will select. The pump should have high positive suction to avoid cavitation, usually take more than 10m. feed water temperature will be more than>65'C.

  • Refrigerator Tubes

    In domestic refrigerator, What are the tubes at the back of the refrigerator called as?


    • Mar 30th, 2018

    What is the main water inlet tube called?


    • Sep 17th, 2011

    It is condenser coil assembly. The Pressurized, hot refrigerant from screw compressor will pass through this coil, heat transferred between the tube coil and the surrounding, as a result the refrigera...

  • Archimedes' Principle

    According to Archimedes principle, mass of an object in water would be less than mass of an object in air.So imagine an object of 5 kg and weight of a vessel containing water as 100 kg. The total weight is 105 kg. Now place a weighing machine under the water vessel and immerse the object into the water. Now can I except the weighing machine shows the weight less than 105 kg?


    • Dec 20th, 2010

    Acc to A.P -- Weight of the water displaced is equal to the weight of the body. So the weighing scale indicate the same weight 105 kg.  but when we lift the body we will feel low weight due to the upward bouncy force. and body float/sink depend upon the bouncy force and metacentre.