Deepakkumar Yadav
ydeepak297@gmail.com How Insulation Resistance of a Transformer is Measured Q. State how insulation resistance of a transformer is measured Before commissioning the transformer it is necessary to know that the insulation resistance of a transformer is greater than a specified value, to avoid excessive leakage currents. Megger test for insulation are carried out between windings, between … Read more
Approximate Values of Body Resistance Q. What are the approximate values of body resistance under ? Body is wet fully Semi dry wet Fully dry condition. Condition of Body Electric resistance of Body ohms 100 V 500 V … Read more
Permissible Limits of Variation of Supply Voltage to Motor and Variation of Frequency Q. Give the permissible limits related to terminal voltage, frequency, temperature rise and speed variation for safe working of electrical machines. Permissible Limits of Variation of Supply Voltage to Motor and Variation of Frequency : The performance of Electric Machines particularly working … Read more
How a Brake Test is Carried Out an D.C. Machine Q. Explain with neat figure how a brake test is carried out an d.c.Machine This is the direct method of testing the machine. The machine is gradually loaded from no load to full load. The pulley is fitted on the shaft of the motor. The … Read more
Advantages of Indirect Testing of Electrical Machines Q. What are the advantages of indirect testing of electrical machines ? Advantages of indirect testing of electrical machines : Power required for testing is less. Big capacity can be tested without actually loading the machines. Considerable amount of power is saved during testing. Results obtained are reasonably … Read more
Parameters do we get From no Load Test and Blocked Rotor Test on 3 Phase Induction Motor and Flow Q. What data /parameters do we get from no load test and blocked rotor test on 3 phase I.M. and flow ? No load test : We get from no load test No load current and … Read more
Objectives of Preventive Maintenance of Electrical Equipment’s Q. State any four objectives of preventive maintenance of electrical equipment’s. The main objective the preventive maintenance is to protect the insulation and to maintain it in good condition to increase the life the machine. Particularly electrical machines which are rotating type, and stationary machines operating on or dealing … Read more
Factors Affecting Preventive Maintenance Schedule Q. State factors affecting preventive maintenance schedule. Also state advantages of same. Position of the machine in the plant : The various machines are positioned in the factory plants as per the sequence of operations and place availability. In certain case of machine, it is so positioned due to constraints … Read more
Methods of Testing on Machine Q. Explain the methods of testing (1) Direct Testing of Machine (2) Indirect Testing of Machine (i) Direct method of testing : In this method the machine is directly connected with the load or a pulley and brake arrangement is provided or a electrical load may be connected in the form … Read more
Objectives of ISS Q. State any four objectives of ISS To specify standards for machines, equipment, apparatus, materials etc. To suggest standard tests for newly manufactured machines. To specify the plus / minus limits for the test results. To specify the tolerance to accept the items. To give ISS certification