Basics of Ball Valves
A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball (called a "floating ball") to control flow through it. It is open when the ball's hole is…
Basic Requirements of Control Valves Sizing
A control valve is a power operated device capable of modulating flow at varying degrees between minimal flow and full capacity in response to a signal from the controlling system.…
Control Valves Theory
The flow regulation  in a valve is accomplished  by the varying  resistance as the valve  is stroked, i.e. its effective cross sectional area is changed. As the fluid moves from…
PID Controller Gains Effect on Manipulated Variable
Observe the Effect of Proportional Gain Kp, Integral Gain Ki and Derivative Gain Kd values with respect to PID Controller Output response shown in below animation. The below graph shown is…
Advantages and Disadvantages of Squirrel Cage Induction motor
Squirrel Cage Induction Motor: Squireel cage induction motors are widely used in industries. Almost 70% of the industrial motors and drives comes under these category. In Squirrel cage induction motors, rotor windings wound in squirrel cage. These…
Advantages of Bundled Conductors in Transmission Lines
For transmission of more power for long distances to load centers Extra High Voltage (EHV) transmission is employed. Implementing Extra High Voltage has advantage of reduction in the copper losses…
Difference between Solid Conductor and Stranded Conductor
Difference between Solid Conductor and Stranded Conductor Solid Conductor: It consists of single piece of metal wire. It is cheap for manufacturing.Skin effect is higher in solid conductors as at…
Corona Ring on Surge Arresters and other EHV equipment
Have you ever seen a ring around the Surge Arrester or other EHV equipment? What is the purpose of the Ring around the Extra High Voltage (EHV) equipment? What is the use…
Sulfur Hexafluoride Gas (SF6) Properties
Sulfur Hexafluoride Gas (SF6) Properties Heavy, chemically inert, non toxic No poisonous effect on the human body but decomposition products are poisonous Color less and odor less It is gaseous at normal room…
DC machines and Induction Machines Viva Questions & Answers
When DC Generator fails to build up the voltage, what are the reasons? No residual magnetism, reversal of field connections and the resistance in the load circuit may be greater…
