Feedback Control Principle
Before we begin our discussion on process control, we must define a few key terms. First, we have what is known as the process: the physical system we wish to…
Flow Meter Installation Guidelines
Flow measurement accuracy of any flow meter becomes compromised is incorrect installation, and pressure-based flow meters are no exception to this rule.
Power Plant Interview Questions & Answers
We prepared an article on Power Plant Interview Questions & Answers which covers basics about power plant operation. Power Plant Interview Questions & Answers 1. Name the four major circuits…
Top 100 Power Plant Engineering Objective Questions & Answers
Top 100 Power Plant Engineering Objective Questions & Answers 1. The commercial sources of energy are (a) solar, wind and biomass (b) fossil fuels, hydropower and nuclear energy (c) wood,…
Why Restriction Orifice is some distance from Blowdown valve ?
Very basic does not imply obvious...i really like this statement. Very often the answer is very fundamental and basic to us, somehow it always does not obvious to us. Restriction…
Calibration and Preventative Maintenance Procedures
Calibration and Preventative Maintenance Calibration: A comparison of two instruments or measuring devices one of which is a standard of known accuracy (traceable to national standards) to detect, correlate, report…
What is a Active Barrier ?
An active barrier uses transformers, optoisolators or relays to provide isolation between the hazardous area and the non-hazardous area. It does not require an intrinsically safe ground connection. Either or…
Zener Diode Barrier Principle
The zener diode barrier works by diverting potentially dangerous energy to ground before it can reach the hazardous area. Zener Diode Barrier Principle The zener diodes limit the fault voltage…
Stepper Motors Objective Questions & Answers
Stepper Motors Objective Questions & Answers 1. A variable reluctance stepper motor is constructed of ______________ material with salient poles. a) Paramagnetic b) Ferromagnetic c) Diamagnetic d) Non-magnetic Answer: b…
Pneumatic Control Mechanisms Objective Questions
Pneumatic Control Mechanisms Objective Questions 1. With a proportional-plus-integral controller, a sustained error will result in: a. Windup b. A fixed offset c. A temporary narrowing of the proportional band…
