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Manufacturing of Cement Cement is essential for construction activity such as building houses, factories, bridges, roads, airports, dams and for other commercial establishments.The first cement plant was set up in Chennai in 1904.It was discovered by an English Mason, Joseph Aspdin in 1824. He called it Portland cement because he thought that it resembled the limestone found in Portland. Approximate Composition of Portland cement Calcium oxide (CaO) 60-70% Silica (SiO 2 ) 20-25% Alumina (Al 2 O 3 ) 5-10% Ferric oxide (Fe 2 O 3  )         2-3% Raw materials are: Limestone -  (provides lime), Clay -  (provides alumina and silica), Gypsum - (reduces the setting time of cement). For a good quality cement, the ratio of silica (SiO) to alumina Al 2 O 3 ) should be between 2.5 and 4 and the ratio of lime (CaO) to the total of the oxides of silicon (SiO 2 ) aluminium (Al 2 O 3 ) and iron (Fe 2 O 3 ) should be as close as possible to 2. ...

History and Generations is an important chapter of Computer Awareness for Bank Exams. Computer awareness is a section in upcoming NICL AO Mains and it is also a section in the mains examination of IBPS RRB, IBPS PO and IBPS Clerk exams. Last year many questions in IBPS Examination were from this topic History and Generations, so aspirants must also prepare this along with other topics. You can find more study notes on computer terms asked in recent bank exams and start your preparation. 1. In 1822, Charles Babbage conceptualized and began developing the Difference Engine, considered to be the first automatic computing machine. 2. Then after almost a decade, Charles Babbage proposed the  first general mechanical computer, the Analytical Engine . The Analytical Engine contained an Arithmetic Logic Unit (ALU), basic flow control, and integrated memory concept and is the first general-purpose computer. 3. In 1946, ENIAC-  Electronic Numerical Integrator and Computer w...

Hello guys, as you know one of the most awaited results, DMRC CRA written result is out today. Congratulations to all successful candidates. I am sure many of you have already started searching for  preparation strategies for next stage which is toughest also. That is DMRC Psycho test for CRA. So to help you guys who want to prepare without coaching we have asked an experienced and successful candidate to share his study material. follow this site created by him to find study material for dmrc psycho test, cut off, negative marking policy and reservation policy and for all doubts. If you want to ask something just drop in the comment section on related post. http://dmrcpsychotest.blogspot.in/ I hope you like this, so kindly comment below the post and do share your response. Thanks for reading :)

For some it was a heartbreaking moment For some it was a devastating defeat For some it was a moment to vent their angst out For some it was a defeat that was hard to digest For some the sleep proved to be a distant dream last night. Yes, it all happened last night & these are the accounts of all emotions that were in the breeze that was only appearing cool but was filled with extremely hot vibes. It was a hard day for Indian Cricket Team and they fell victim to the pressure. But for some it was a dark, gloomy night to learn some hard lessons of life. The people who learn from their mistakes & rectify them & implement those improved changes in the work. Yes, you got it right. These people are no extra-ordinary people but are quick learners & recover swiftly. People like these are present among you. They are the aspirants who are ahead of their peers not in terms of preparation always but in terms of temperament & learning capabilities. They accept failures as go...

The Earth is surrounded by a layer of gas called the atmosphere.The atmosphere extends up to a height of about 1,600 kilometres.  The atmosphere is composed of: Nitrogen (78.09%), Oxygen (20.95%), Argon(0.93%),  Other gases(0.03%) Air pressure As we go up the layers of the atmosphere, the pressure falls rapidly. The air pressure is highest at sea level and decreases with height. In areas where the temperature is high the air gets heated and rises. This creates a low-pressure area. Low pressure is associated with cloudy skies and wet weather.In areas having a lower temperature, the air is cold. It is therefore heavy. Heavy air sinks and creates a high-pressure area.High pressure is associated with clear and sunny skies. Our atmosphere is divided into five layers starting from the earth’s surface.  These are Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere. 1.Troposphere:  This layer is the most important layer of the atmosphere.  I...

Electric Circuit   A continuous and closed path of an electric current is called an electric circuit. Electric current is expressed by the amount of charge flowing through a particular area in unit time. Direction of Electric current Electric current was considered to be the flow of positive charges.Conventionally, in an electric circuit, the direction of electric current is taken as opposite to the direction of the flow of electrons, which are negative charges.If a net charge Q flows across any cross-section of a conductor in time t, then the current I, through the cross-section is:           I = Q/t The SI unit of electric charge is Coulomb (C).The SI unit of electric current is ampere (A). One ampere One ampere is constituted by the flow of one coulomb of charge per second. Ammeter   An instrument called ammeter measures electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured...