Deepakkumar Yadav
Activities That are Done During Preventive Maintenance of Induction Motors Q. State any six activities that are done during preventive maintenance of induction motors. The activities that are done during preventive maintenance of induction motors are : Attention towards brushes : Sparking at the brushes : Sparking is produced due to misalignment of commutator, mechanical … Read more
ENERGY CONSERVATION AND ENERGY AUDIT (CONCEPTS AND DIFFERENCE) Energy Conservation Energy conservation effort made to reduce the consumption of energy by using less of an energy service. This can be achieved either by using energy more efficiently or by reducing the amount of service used. Energy conservation reduces the need for energy Services and can … Read more
Internal and External Causes for Failure of Equipment Q. List internal and external causes for failure of equipment’s. Internal Causes : In some unavoidable situation the machine may have to be run “over loaded” for a longer period which causes temperature rise beyond the permissible limit. During normal working shot-circuit may occur due to some reasons. … Read more
Procedure to Perform Break Test on DC Series Motor. Q. Draw a neat labelled sketch and state the procedure to perform break test on DC Series Motor. The procedure to perform break test on DC Series Motor is as follows: One important precaution in this case of motor to be taken that at no-load its … Read more
Do’s and Don’ts to achieve safety while working in substation. Q. List out Do’s and Don’ts to achieve safety while working in substation. Sr. No. Do’s Don’t 1 Please sign ‘Men working’ or warning boards on the main switch before commencing work. Do not close any switch, unless you are familiar with the circuit which … Read more
Direct, Indirect and Regenerative Type of Testing on Machine Q. Compare direct, indirect and regenerative type of testing. Sr. No Point Of comparison Indirect Test Direct Test Regenerative Test 1 Loading Method It is a not load indirect test. It is a direct load test. It is an indirect back to back or regenerative test. … Read more
Procedure for Developing Preventive Maintenance Schedule Q. Explain procedure for developing preventive maintenance schedule. Following points are firstly considered prior to prepare a final preventive maintenance schedule. Too frequent inspections – will cause waste of time and will not be economical. Too less frequency will invite failure of operation of machine ; and it will … Read more
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