Deepakkumar Yadav
Parameters do We Get From no Load Test and Blocked Rotor Test on 3-Φ Induction Motor Q. What data / parameters do we get from no load test and blocked rotor test on 3-Φ induction motor. No load test and blocked rotor test : Equivalent leakage reactance = X01= √ [Z01]2 _[R01]2 Form the no load … Read more
Maintenance of Motors which Help in Energy Conservation Maintenance : Inadequate maintenance of motors can significantly increase losses and lead to unreliable operation for example, improper lubrication can cause increased friction in both the motor and associated drive transmission equipment. Resistance losses in the motor, which rise with temperature, would increase. Providing adequate ventilation and … Read more
Effect of Misalignment on the Performance of Machine Q. What happens, If leveling and alignment of two shafts of directly coupled machines are not matched? OR What is the effect of misalignment on the performance of machine ? The shaft, pulleys, couplings of driven and driving machine need proper alignment. If it is not ensured … Read more
Basic Requirements of Machine Foundation Q. State three basic requirements of machine foundation. Requirements : Foundation shall be horizontal level (check by spirit level) Foundation should be rigid to absorb vibrations. It should transmit, both static and dynamic weight of the machine to ground.
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
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
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
Positive Features of Energy Efficient Motor Q. State the significant features of energy efficient motor. Features are : Starting and running torque is more. Noise and vibrations are very very less. Material used for its construction is of high quality having higher flux densities and current density. Maintenance required is very less. Power factor is … Read more
Special Tests of 3 Phase Induction Motor Q. Explain the special tests of 3 phase induction motor. Open Circuit Voltage Ratio Test : The test is carried out to find out the voltage ratio or turns ratio. As shown in figure A the rotor resister starter is disconnected from the springs and voltmeter is connected … Read more
Circuit Diagram for Performing Load Test on 415 V, 3 Phase, 4.8A, 3HP, Delta Connected sq. Cage Induction Motor Q. Draw a neat circuit diagram for performing load test on 415 V, 3Φ, 4.8A, 3HP, Delta connected sq. cage induction motor. Specify the meter ratings.