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Biochemical oxygen demand Biochemical oxygen demand (BOD) is the measurement of oxygen consumed by living microorganisms (primarily bacteria) while utilizing the organic matter present in a water or waste sample under conditions as close as possible to those that occur in nature. Microbial conversion of nitrate to nitrite will also contribute to BOD . Non-biodegradable (or refractory) organic compounds will not contribute to BOD . In order to make BOD test quantitative, the samples must be protected from the air to prevent reoxygenation as the dissolved oxygen concentration diminishes. Also, high-concentration wastes must be diluted to ensure that dissolved oxygen will be present throughout the test duration. It is important that the environmental conditions during the test be suitable for living organisms. Therefore nutrients are added to the dilution water. Nutrient blanks must be included in the test to ensure that the nutrient-enriched dilution water does not contribute to  BOD .

Depreciation Depreciation is taken from the Latin word Depretium. De Means Decrease and premium mean price. Thus the meaning of Depreciation is decreased in princes. The reduction of the value of equipment and building is known as Depreciation. Normally the power plant has age is 50 to 60 years. after its useful life, we need to maintain or change the machine or equipment of the power plant. Thus to change the machine or equipment we have to save money, this is the amount that is saved every year known as the Depreciation charge. Types of Depreciation Method 1. Straight-line method The straight-line method is a simple method to calculate  depreciation. In this method, we calculate the amount based on the initial cost divided by the useful life of the equipment if the salvage value is zero. If a salvage value is few amounts then we subtract the initial value from the salvage value and divide it by helpful life. Depreciation charge = initial value  - salvage value / Useful life Strai

Rotameter Rotameter is a device that measures the flow rate of liquid or gas in a closed tube. It consists of a tube and float. The rotameter is standard as a result of its linear scale, relatively long measurement range, and low-pressure drop. It is very simple to install and maintain.  In the construction of the rotameter tube, it is marked in the division, and the reading of the meter is obtained from the scale reading at the reading edge of the float, which is taken at the largest cross-section of the float. Rotameter Is Used The rotameter is an Associate in Nursing industrial flowmeter wont to live the flowrate of liquids and gases. The rotameter consists of a tube and float. The float response to flow rate changes is linear, and a 10-to-1 flow varies or nonacceptance is customary. within the case of OMEGA™ laboratory rotameters, so much larger flexibility is feasible through the utilization of correlation equations. The rotameter is standard as a result of its linear scale, a c

Coherence In Physics Two waves are said to be coherent if they have the same frequency (or wavelength) and are in phase ( or have a constant phase difference between them). The coherence of a wave depends on the characteristics of its supply. The light produced by lasers is coherent light. Light from light bulbs or the sun is incoherent light. A high  coherence means high fringe visibility with excellent contrast (i.e. good black and white fringes or black and whatever color the light is) and low coherence means washed-out fringes and zero coherence means no fringes. Another necessary condition (for waves to be coherent) is therefore that both waves travel at the same speed. It can be well understood from Fig. (1) and (2). Fig. ( 1) shows a typical beam of light waves from an ordinary source traveling through space. It is a concept that establishes the limits within which a real light source can be considered ideal. It is a measure f the correlation that exists betwee

Computer System Architecture The computer system may be organized in a number of different ways, which we can categorize roughly according to the number of general-purpose processors used. Single-Processor Systems Most systems use a single processor. The variety of single-processor systems may be surprising, however, since these systems range from PDAs to mainframes. On a single-processor system, there is one main CPU capable of executing a general-purpose instruction set, including instructions from user processes. Almost all systems have other special-purpose processors as well.  They may come in the form of device-specific processors, such as a disk,  keyboard, and graphics controllers; or, on mainframes, they may come in the  form of more general-purpose processors, such as I/O processors that move  data rapidly among the components of the system.  All of these special-purpose processors run a limited instruction set and  do not run user processes.  Sometimes they are managed by

Corona Effect Electric power transmission for all intents and purposes manages the mass exchange of electrical vitality, from creating stations arranged numerous kilometers from the fundamental utilization focuses or the urban communities. Thus, the long-separate transmission links are of the most extreme need for effective power exchange, which obviously results in colossal misfortunes over the framework. Limiting those has been a noteworthy test for control architects generally and to do that one ought to have an unmistakable comprehension of the sort and nature of misfortunes.  High voltage control transmission, a substantial power conveyed through the conductor. At the point when the power is exchanged through the conductor, the voltage awe between the conductor and air will make a capacitance for the line. The marvels of violet gleam, murmuring clamor, and production of the ozone gas contained in the overhead transmission lines are typically favored as the corona effect  in the tr

Rajasthan Patwari Paper and Answer Key The Rajasthan Subordinate & Ministerial Staff Selection Board RSMSSB will hold the Patwari Paper 2021 on the 23rd and 24th of October at various exam centres throughout the state. According to reports, more than 15 lakh people are taking the Patwari Paper . The board has set up over 4000 examination centers across the state to administer the exam. Patwari Exam Q uestion  Paper 2021 Paper Name Question Paper 23 Oct shift 1 Download Now 23 Oct shift 2 Download Now 24 Oct shift 1 Download Now 24 Oct shift 2 Download Now Unofficial Answer Key pdf files 23 October Shift 1 Answer Key pdf  –  Download Here 23 October Shift 2 Answer Key pdf  –  Download here 24 October Shift 1 Answer Key pdf  –  Download Here 24 October Shift 2 Answer Key pdf Unofficial Answer Key pdf f Official Website Links Official Website –  Visit Here Official RSMSSB Patwari Answer Key Page – to be added here Since the examinations for all four shifts were completed at the time o