BJT Amplifiers Interview Questions & Answers
1. Explain what is an amplifier? The device that amplifies the amplitude of the input signal is called the amplifier. An amplifier may be defined as a device that increases…
Electronic Equipment Purging Principles & Standards
What is Purging? Purging/pressurization systems permit the safe operation of electrical/electronic equipment under hazardous conditions when approved hazardous location equipment is not part of the application or the equipment is rated…
Variable Frequency Drive (VFD) Working Principle
History of Variable Frequency Drives (VFD) When Tesla first introduced the 3-phase alternating current (AC) induction motor in 1888, he knew that his invention was more efficient and reliable than…
Thermowell Design Guidelines
When fluid flows past a thermowell inserted into a pipe or duct, vorticies form at both sides of the well. These vorticies detach, first from one side, and then from the other. This…
Coriolis Mass Flow Meter Working Principle
Mass flow meters are the types of flow meters that are mainly employed in mass-related processes such as chemical reactions, heat transfer, etc. In all these processes, accurate measurement of…
Working Principle of Vortex Flow Meter
Vortex flow meters measure the frequency of vortices generated by a bluff body or shedder bar to calculate an equivalent volumetric flow rate.
Thermal Mass Flow Meter – Principle, Advantages, Applications
Thermal mass flow meter principle is rate of heat absorbed by a fluid flowing in a pipe or duct is directly proportional to its mass flow.
Oval Gear Meter – Principle, Advantages, Limitations, Applications
Oval Gear Meter measures flow by using a geared rotor to pass known volumes of fluid through a housing. (Positive Displacement Flow Meter)
Facts About Control Valves
Study facts about control valves include pressure drop of control valves, capacity requirements of control valves, valve rangeability, characteristics of control valves, valve body design etc. Facts About Control Valves…
HART Communication Protocol Overview
HART is a digital signal that rides on a standard 4 mA ... 20 mA process control loop. In the field of process automation, the 4 mA ... 20 mA…
