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Basic Electrical
Applications of Wind Energy
Applications of Wind Energy Wind turbine generators have been built in a wide range of power outputs. Machines of low power can generate sufficient electricity for space heating and cooling of homes and for operating domestic appliances. Low power generators are used for corrosion protection of buried metal pipe lines. Higher power turbines upto 50 … Read more
Roles of Bureau of Indian Standards in Testing of Electrical Equipment
Roles of Bureau of Indian Standards in Testing of Electrical Equipment Q. State the roles of Bureau of Indian standards in testing of Electrical equipment. Roles of bureau of Indian standards in testing of electrical equipment : Indian National institute i.e. Indian standard Bureau specifies the standards for particular machines apparatus, equipments material and so … Read more
Factors Affecting Earth Resistance
Factors Affecting Earth Resistance Q. Explain factors affecting earth resistance. Earth Resistance or Resistance to Earth : The resistance offered by the earth electrode to the flow of current into the ground is known as resistance to earth. The term Resistance to Earth or Earth Resistance does not imply the contact resistance between the earthing … Read more
Permissible Limits for Variations in Electrical Machine
Permissible Limits for Variations in Electrical Machine Q. State the permissible limits for variation of : 1) Voltage 2) Current 3) Speed 4) Frequency. Voltage variation should not be ±5% of rated voltage. Current should not exceed rated current. Temperature rise should be within limits. Frequency should not vary by ±1 of rated frequency. Should work within ±2% of rated speed. … Read more
Importance and purpose of Earthing
Importance and purpose of Earthing Q. Explain importance and purpose of earthing. To save human life from shock due to current leakage of installation. To protect large buildings from lightening fall. To isolate the faulty section. This is achieved by providing path of leakage current through earthing system at this instant protective gearing operates. To … Read more
Factors Governing the Selection of Co-generation System
Factors Governing the Selection of Co-generation System Q. State and explain the factors that govern the selection of co-generation system for an industry. Heat to power ratio : The heat to power ratio of consuming system should match with the characteristics of of co-generation system the co-generation system. It is represented on the basis of … Read more
Factors Affecting Earth Resistance
Factors Affecting Earth Resistance Q. Explain factors affecting earth resistance. Earth Resistance or Resistance to Earth : The resistance offered by the earth electrode to the flow of current into the ground is known as resistance to earth. The term Resistance to Earth of Earth Resistance does not imply the contact resistance between the earthing … Read more
Method of Measurement of Insulation Resistance
Method of Measurement of Insulation Resistance Q. State the method of measurement of insulation resistance and explain any one method. Methods of measurement of Insulation Resistance (IR) : By using megger By voltmeter method An insulation resistance meter is a megger which indicates the resistance directly. Disconnect the equipment from mains and then connect one … Read more
Schafer’s Prone Pressure Method
Schafer’s Prone Pressure Method Q. State method of artificial respiration and claim. Schafer’s prone pressure method : Lay the patient on his belly, one arm extended directly overhead, the other arm bent at elbow and with the face turned outward and resting on the second hand of forearm, so that the nose and mouth are … Read more