211 SRI RAMAKRISHNA MISSION VIDYALYA POLYTECHNIC COLLEGE.

  Industrial Applications of Ultrasound It is used to detect any defects present in metals. It is used to clean jewellery made out of precious metals. It is also used for echo sounding by ships and submarines in water bodies. Ultrasound is also used for valve bypass. It is also used for vacuum leak detections. Ultrasound is also used for leak surveys. It is used in compressed air leak management. It is also used for complex gearbox fault analysis. It is used in cavitation detection in pumps. Ultrasound is used in steam trap testing. It is also used for steam systems management. It is also used for tightness testing of non-pressurized volume. It is used in electrical systems inspection. It is used in heat exchanger (shell and tube) testing. It is also used to detect tank and pipe wall thickness. It is used in evaluating fluid flow. It is also used for slow-speed bearing monitoring and analysis. It is used in monitoring the condition of bearings. It is also used for the on-condition ...

The Raspberry Pi family includes several models, each tailored for different uses and budgets, ranging from the compact  Raspberry Pi Zero to the powerful Raspberry Pi 4 Model B and the specialized Raspberry Pi 400 keyboard .   Here's a breakdown of some key Raspberry Pi models: Raspberry Pi Zero: A very small and low-cost option, ideal for embedded projects and projects where size and power consumption are critical.   Raspberry Pi 3: A popular third-generation model that superseded the original Raspberry Pi and Raspberry Pi 2, maintaining the popular board format.  

  Self-Excited Induction Generator (SEIG) An induction machine requires reactive power for excitation whether it operates as a generator or motor.  In a grid-connected induction generator, it draws reactive power from the grid. A self-excited induction generator does not require an external power source to operate.  It is used in small-scale power plants where the grid connection is not available. In SEIG, a capacitor bank is used to provide the necessary reactive power for excitation. It is connected in delta configuration across the stator’s terminals.  The prime mover rotates the rotor with enough speed to induce a voltage across the stator’s terminals.  As a result, the capacitor current starts following providing the reactive power for the excitation. The capacitor also supplies reactive power to the load.

  Construction of synchronous motor The  construction of a synchronous motor  (with salient pole rotor) is as shown in the figure at left. Just like any other motor, it consists of a stator and a rotor.  The stator core is constructed with thin silicon lamination and insulated by a surface coating, to minimize the  eddy current and hysteresis losses .  The stator has axial slots inside, in which three phase stator winding is placed. The stator is wound with a three phase winding for a specific number of poles equal to the rotor poles.  The  rotor in synchronous motors  is mostly of salient pole type. DC supply is given to the rotor winding  via slip-rings.  The direct current excites the rotor winding and creates electromagnetic poles. In some cases permanent magnets can also be used.

  Eddy current is defined as the induced current in a conducting coil when a magnetic flux is allowed to flow through it or in other words, it is the induced current in a conducting body due to a change in magnetic flux. The eddy current definition can be explained as an important nature of a solid conducting body. Eddy Currents: When a conductor is placed in a changing magnetic field, circular currents, known as eddy currents, are induced within the conductor.  Induction Heating: Induction heating leverages this principle by using a high-frequency alternating current (AC) to generate a rapidly changing magnetic field.  Joule Heating: As the eddy currents flow through the resistance of the material, they generate heat through Joule heating (also known as resistive heating).  Applications: Induction heating finds applications in various fields, including: Induction hardening: Heating specific areas of metal parts to increase surface hardness.  Induction forging: ...