Deepakkumar Yadav
Deepakkumar Yadav How to Prevent an Electrical Machine During its Inactivity Q. How to prevent an electrical machine during its inactivity? If the machine remains un-operated and kept idle for a long time it will not work properly and even may fail to operate. The reasons being : Moisture, din, dust from the surroundings is absorbed and … Read more
Methods of Purifying and Drying Out of Transformer Oil Q. State the methods of purifying and drying out of transformer oil and explain any one method brief with neat sketch Q. Explain the filtering process for transformer oil filtration. Purifying of transformer oil : There are mainly following three types of oil filter in common … Read more
Causes of Low Insulation Resistance of Electrical Equipment Q. What are the causes of low insulation resistance of electrical equipment and how will you made it high? The equipment may have : Low value of volume resistance. Surface resistance may be lower. Dielectric strength must have been lower. Dielectric constant (∈) may be lower. Dielectric … Read more
Agents which Contaminates the Insulating Oil Q. List the agents which contaminates the insulating oil. The insulating oil gets contaminated when the following impurities are present in it. The impurities will reduce the dielectric strength of oil and further in may loose its dielectric and insulating properties. Water Dirt / dust Carbon deposits Sulphur Acids … Read more
Indian Renewable Energy Development Agency Q. Indian Renewable Energy Development Agency (IREDA) Indian Renewable Energy Development Agency (IREDA) is a profit making public sector financing company under the administrative control of Ministry of Non-conventional Energy Sources (MNES) and Ministry of Non-conventional Renewable Energy sources (MNRE). IREDA was promoted by government in 1987, mainly for promotion … Read more
Uses of Filler Gauges Q. Explain the use of : Filler gauges The air gap should always be checked after dismantling and reassembly, it is also a part of routine maintenance, particularly in case of sleeve bearing machines. These apertures are usually plugged to exclude dirt, and the screwed plugs must be removed to permit … Read more
Dielectric Strength Test on Transformer Oil Q. With the help of neat figure explain the dielectric strength test on transformer Oil. Dielectric strength test : The dielectric strength of transformer oil is carried out with testing kit which consists of a standard oil test cell which is approximately 100 x 60 mm in cross-sectional area … Read more
Measurement of D. C. Resistance of a 3-phase Induction Motor Q. State any two tests that are preferred on induction motors. Explain these tests in brief Measurement of D. C. Resistance of a 3 – phase Induction Motor : The state of the 3- phase induction motor may be star connected or delta connected. The … Read more
Types of Extinguishers Q. State different types of extinguishers. Which one is effective ? The following types of extinguishers are portable, and in smaller sizes, can be operated with ease by one person. These extinguishers are primarily intended to one against fires in their initial stage, at the seat of the fire. Dry Powder Extinguishers : … Read more
Properties of Transformer Oil Q. 10 List the properties of transformer oil Water content Acidity Density Flash point Fire point Purity Viscosity Dielectric strength Sludging