Deepakkumar Yadav
Need of Energy Conservation In Induction Motor Q. Explain the necessity of energy conservation in electrical motors. India is a growing economy and the economic growth of any country largely depends on industrialization and energy consumption. The growing cost of energy due to limited stock of energy sources calls for power saving at each possible … Read more
Uses of Earth Tester Q. Explain the use of : Earth Tester. The resistance of earth can also be measured by an earth tester. The indication of the earth tester depends up on the ratio of the voltage across the pressure coil and the current through the coil. The deflection of its pointer indicates the … Read more
Comparison Between Soft starter With D.O.L. Starter Q. Comparison between soft starter with D.O.L. starter ? Sr. No. parameter Soft Starter Direct On Line (DOL) Starter 1 Starting Smooth starting, no jurks. Starts with jurks. 2 Current peak Low. Very high (6 to 8 x motor current) 3 Maintenance Zero. More. 4 Voltage dip Negligible. … Read more
Troubles in Electrical Insulation and cables Q. List common troubles in electrical insulation and cables. Mechanical failure Dielectric failure Thermal cause of failure Chemical failure Failure due to ageing
Testing of Dielectric Transformer Oil Q. Explain how following test is carried for transformers. Testing of dielectric transformer Oil Dielectric strength test : The dielectric strength of transformer oil is carried out with testing kit which consist of a standard oil test which is approximately 100 X 60 mm in cross-sectional area and 85 mm high. … Read more
Uses of Dial Indicator Q. Explain the use of : Dial Indicator By this indicator the shape (whether true or damaged) of various rotating parts of machine such as shafts, rotors, commutators are checked. These consists of system of interlink livers / Gear wheels. By this the small moments are magnified to enable to read … Read more
Hot Dip Method of Varnishing for a Transformer Q. Explain the hot dip method of varnishing for a transformer. Vacuum impregnation is carried out in a vacuum impregnation plant; which consists of a double jacketed vacuum impregnating chamber.It is having atop removing cover. There is separate varnished storing tank. A compressor cum vacuum-exhauster which can … Read more
Various Methods of Heating the Machine Q. Explain the various methods of heating the machine. The various methods of heating the machine are as follows : External heat : It is the method of drying insulation most frequently used. The various methods of applying external heat are : Baking in the oven : It is … Read more
Causes of Heat in Bush-bearings of Electrical Machines Q. What are the causes of heat in bush-bearings of electrical machines ? Following are the causes of heat in bush-bearings : Worn out bearings / sleeves. Worn out shaft. Loss of lubrication. Mis-alignment of shaft pulleys couplings. Heavy vibration and noise due to uneven air-gap in … Read more
Properties of Good Transformer Oil Q. State and explain any four properties of good transformer oil. The properties of good transformer oil or mineral oil are recommended by IS 335-1963. To maintain the properties. IS 1866-1961 is referred. Usually mineral oil grade B is used for switchgears, transformers. It should posses the following properties : … Read more