211 SRI RAMAKRISHNA MISSION VIDYALYA POLYTECHNIC COLLEGE.

  Absorbent Glass Mat (AGM) Technology:  AGM or Absorbent Glass Mat is an advanced lead-acid battery that provides superior power to support the higher electrical demands of today’s vehicles and start-stop applications. AGM batteries are extremely resistant to vibration, are totally sealed, non-spillable and maintenance-free. AGM offers better cycling performance, minimal gassing and acid leakage when compared with conventional lead-acid batteries. The result of all the features of AGM technology is superior life performance. AGM Battery Applications:   Start-Stop Vehicles, Large Audio Systems, Heated Seats and Other Electronic Accessories. If you’re looking to power a vehicle with numerous electronic features or plug-in accessories, you should consider a deep-cycle battery, or a battery made with advanced technology like AGM. AGM batteries are a great premium choice for high-end and advanced fuel-efficient vehicles with large power demands, and for people who seek greate...

  Conditions for Parallel Operation of Three-Phase Transformers The conditions for satisfactory parallel operation of three-phase transformers are as follows            1.The parallel connected transformers should have same polarities. 2. The parallel connected transformers must have identical primary and secondary voltage ratings. 3. T he winding reactances to the resistances ratios in the parallel connected transformers should be the same. 4. The phase s equence of all the parallel connected transformers must be the same. 5. The phase shift between the primary and secondary voltages must be the same for all the parallel connected transformers  6.All the parallel connectd transformers should be in the same vector group.

  The turns ratio of a transformer is  the number of turns on the primary winding divided by the number of turns on the secondary winding .  The turns ratio determines whether a transformer is step-up or step-down, and affects the voltage and current required on the secondary winding: Step-up transformer The secondary voltage is higher than the primary voltage, and the current steps down. Step-down transformer The secondary voltage is lower than the primary voltage, and the current steps up.     To calculate the turns ratio, divide the higher number by the lower number.  For example, if the primary has 600 turns and the secondary has 120 turns, the turns ratio is 600/120.     You can use a transformer winding calculator to calculate the turns ratio, primary and secondary full-load currents, and the type of transformer

 There are currently more than 30 million driverless cars in the world. This number is projected to grow exponentially as companies like Tesla pour money into the development of such vehicles. zPod - India’s first-ever autonomous vehicle (AV) Self-driving vehicles are steadily becoming a reality despite the many hurdles still to be overcome – and they could change our world in some unexpected ways for a better and safe future. By 2050, cars will almost certainly be self driving and powered by AI. Experts in the field of embedded technology predict that autonomous driving will create $300 to $400 billion in revenue in the next ten years. (Auto Approve) The zPod, which doesn’t have a steering wheel, is claimed to be able to deliver Level autonomy, as defined by the Society of Automotive Engineers. This is considered to be when the AV has complete control of driving in all conditions.

  Features of Regulated Power Supply Following are the main features of the regulated power supply − The regulated power supplies have the efficiency ranging from 20% to 25%. Regulated power supplies are relatively more reliable. Regulated power supplies have less complex circuit and less weight. Regulated power supplies give faster response. The cost and noise level of the regulated power supplies is low.

  Voltage Doubler A voltage doubler application is a DC power supply capable of using either a 240 VAC or 120 VAC source. The supply uses a switch-selected full-wave bridge to produce about 300 VDC from a 240 VAC source. The 120 V position of the switch rewires the bridge as a doubler, producing about 300 VDC from the 120 VAC. In both cases, 300 VDC is produced. This is the input to a switching regulator producing lower voltages for powering, say, a personal computer.   Half-Wave Voltage Doubler The half-wave voltage doubler in Figure 1(a) is composed of two circuits: a clamper shown in (b) and a  peak detector  (half-wave rectifier) in (c). C 2  has been added to this peak detector (half-wave rectifier).   Figure 1.  Half-wave voltage doubler (a) is composed of (b) a clamper and (c) a half-wave rectifier.   Half-wave Voltage Doubler Operation Circuit Analysis Referring to Figure 1(b) above , C 2  charges to 5 V (4.3 V considering the di...

  Comparison  between Current Transformer and Voltage or Potential Transformer Current Transformer (CT) Potential Transformer (PT or VT) CT step-down the high current to the safe level of current. PT step-down the high voltage levels to the safe level of voltage. Symbol of CT Symbol of PT or VT Its primary winding is connected in series with the line to be measured. Its primary is connected in parallel to the line to be measured. It has a fewer number of turns in its primary winding. It has a large number of turns in its primary winding. It has a large number of turns in the secondary winding. It has few numbers of turns in the secondary winding. Its secondary cannot be open circuit. Its secondary can be open circuit. It has a very high turn ratio. It has a very low turn ratio. Its accuracy does not depend on the secondary burden (numerous ammeters can be connected to output). Its accuracy depends on the secondary burden and causes an error when numerous voltmeters are connect...