Types of Flow Meters
Types of flow meters are divided into two groups. One measures quantity (Positive Displacement); the other measures rate of flow (Inferential).
Split Range Control Working Principle
Split-range control is used when a single controller is employed to control two final-control elements (two valves for example). In such a system, the controller struggle to keep one controlled…
Circuit Breaker Making Capacity
During short circuit, circuit breaker contacts opens and automatically closes after few cycles to determine whether the fault is cleared. 90% of the faults occur in power system are transient…
Power Systems Operation and Control Interview questions
What is load curve? The curve drawn between the variations of load on the power station with reference to time is known as load curve. There are three types, Daily…
How Integral Controller Reduces offset error ?
First we have to know how offset error appears in Proportional controller. Click here to read the article on proportional controller offset error. Automatic reset or integral action corrects for…
Why Offset in Proportional Controller ?
Proportional controller: With proportional band, the controller output changes in "proportion" to the error between process variable and set point. The amplitude of the change is adjustable from 1% to…
Basics of Fire Extinguisher
Fire Extinguishers are more popular, compared to the remaining Fire Protection Systems. You may identify them as red colour cylinders, seen generally at the doors. Fire Extinguishers come of a…
Thermistors and Resistance Temperature Detectors (RTDs)
One of the simplest classes of temperature sensor is one where temperature effects a change in electrical resistance. With this type of primary sensing element, a simple ohmmeter is able…
What is a Network ?
What is a Network ? A network consists of two or more computers that are linked in order to share resources (such as Internet, Data, printers and CD-ROMs), exchange files,…
Control Valve Positioner Working Principle
A Control Valve Positioner is a device used to increase or decrease the air load pressure driving the actuator until the valve's stem reaches a “POSITION” balanced to the output SIGNAL from…
