Deepakkumar Yadav
Requirement of Foundations for Installing Rotating Electrical Machines as Per IS 900-1992 Q. What are requirement of foundations for installing rotating electrical machines as per IS 900-1992 ? A solid foundation of concrete is provided for the installing of rotating machine. To avoid misalignment of plate proper mounting of the machines, the motor or prime … Read more
How Back to Back test is Performed on 3 Phase Transformer Q. Explain how back to back test is performed on 3 phase transformer. Back to back test on 3- phase transformer Back to back test as seen for the single phase transformers is also applicable in plus transformers. It is a regenerative test, requires … Read more
Procedure of Alignment of Shaft of Electrical Machine Q. Explain the procedure to be followed in aligned two shafts to be Directly coupled and Indirectly coupled OR Explain the procedure for levelling and alignment of electrical machine. Figure A OR Explain procedure of alignment of shaft of electrical machine. The alignment of direct – coupled … Read more
Impulse Voltage Withstand Test on Transformers Q. Describe the impulse voltage withstand test on transformers. Figure (A) Lightening impulse test : (This is a type test) In practice the transformer is subjected to lightening strokes and switching surges. In such case ordinary high voltage tests are not useful. The test voltage wave is generated by … Read more
Effect of Unequal Voltages and Change in Input to Prime Mover on Parallel Operation and Load Sharing of Alternators Q. What is the effect of unequal voltages and change in input to prime mover on parallel operation and load sharing of alternators. Effect of Inequality of EMF / Unequal Voltage : In a perfect synchronization … Read more
Trouble Shooting Chart of 3 Phase Transformer Q. Explain the trouble shooting chart of 3 phase transformer. Sr. No Trouble/ symptoms Possibility of causes Tests/ Remedies/ Rectification 1 Insulation resistance between core windings lowered down Over heating. Moisture entry Lightening and switching surges. Check transformer coil. Replace or filter the oil. Dry the transformer. Check … Read more
Functions of National Productivity Council Q. State the functions of National Productivity Councils. Following are the functions : Productivity publication. Productivity research and data base. Consultancy to organizations on productivity improvement. Training of staff a different levels. Productivity information through workshops, seminars, conferences etc. Product awards. (A) Bureau of Energy Efficiency (BEE)and its Role (B) … Read more
Benefits and applications of VFD Q. Benefits of VFD and applications of VFD Benefits of VFD Following are the benefits of VFD : Energy saving. Less cost. Smooth starting. Better process control. Less maintenance. Improves p.f. Bearings, motor’s life is large. Improved power quality. Applications of VFD Following are the applications of VFD : For … Read more
Chart showing Efficiency Improvements by Special Motors Power loss area Efficiency improvement 1. Iron Use of thinner gauge, lower loss core steel reduces eddy current losses. Longer core adds more steel to the design, which reduces losses due to lower operating flux densities. 2. Stator I2R Use of more copper and large conductors increases cross … Read more
Energy Efficient Motors Specialty & Its Constructional Improvement As stated earlier, the energy efficient motor is that motor which operates giving efficiencies (2 to 4 % more than other standard motors), operates at reasonably good power factor and loss of power is lesser. These are manufactured with the change in design of slot shapes. Specialty of Motor … Read more