High resistivity materials are used for making resistance elements for heating devices, starters for electric motors, resistances used in precision measuring instruments, loading resistances and rheostats and filaments for incandescent lamps. High resistivity materials are used in all such applications where a large value of resistance is required. If low resistivity materials were used for such […]
Single Phasing of Induction Motor The single phasing of three phase induction motors forms the most common hazard to motor operation, because of the possibility of overheating and burning-out of the motor under this condition. By single-phasing is meant the opening of one wire (or leg) of a three-phase circuit whereupon the remaining leg at
Transformer absorbs moisture sometimes which is very harmful to its health. Presence of moisture can be detected by two following tests: Checking Insulation Resistance of Winding: Insulation resistance of winding should be checked with a 1000 V megger, the voltage should be applied for one minute. All the windings except the winding under test should
The transformer oil or insulating oil is used in transformers as well as some electrical equipment to: This oil should be clean, free from moisture and other harmful contaminants and possess the following characteristics: Dielectric strength (one minute)- 40 KV (RMS) with a 4 mm gap.Viscosity at 27oC in centistokes-max.– 27Pour point-max. – minus 10oC.Flash point-min.
Hi friends, In this article, I am discussing some important types of pressure transducer, pressure transducer working principle, advantages, disadvantages, and applications. So let us start. Pressure transducers are used to measure pressure. In a pressure transducer, firstly, the pressure is converted into a displacement by an elastic element like Bourdon tube, diaphragm, bellows, etc. And then
There is a large number of ratings associated with thyristors. These ratings are in terms of voltage, current, power, temperature and derivatives of voltage and current and time to switch on and off. In practice, it may not be necessary to give consideration to each and every rating to make choice of a thyristor. Thyristor
Hi friends, In this article, I am going to discuss the domestic refrigerator working principle and construction. You will find this article interesting and informative. So let us start. The common type of domestic refrigerator has a cabinet shaped with compressor, the condenser and receiver fitted in their basement. The expansion valve and evaporator coils are exposed
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Electron beam welding in vacuum utilizes the kinetic energy of electrons traveling with high velocity in a high vacuum (10-3 to 10-5 mm Hg). When the electrons strike the surface of the metal, they give up the bulk of their energy as heat, and this goes to melt the metal. If the work is done in
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The laser is a device that produces a concentrated coherent light beam by stimulating electronic or molecular transitions to lower energy levels. The word laser is an acronym for “light amplification by stimulated emission of radiation”. The laser beam is a highly concentrated source of energy which has many applications. It can be used for welding,
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Properties and Applications of Soft Magnetic Materials Materials which have a steeply rising magnetization curve, relatively small and narrow hysteresis loop and consequently small energy losses for each cycle of magnetization are called soft magnetic materials. Soft magnetic materials are, therefore, employed in building cores for use in alternating magnetic fields. The commonest soft magnetic materials
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