Senior Instrumentation Executive Interview Questions and Answers

DCS is used for continuous process control while PLC is used for discrete control.

• DCS is used in industries such as oil and gas, chemical, and power plants.

• PLC is used in industries such as manufacturing, automotive, and packaging.

• DCS is designed for controlling continuous processes with multiple variables.

• PLC is designed for controlling discrete processes with on/off control.

• When selecting between DCS and PLC, consider the type of process, the complexity of the control, and ...read more

Mag flow meter is not suitable for measuring fluids with low conductivity.

• Mag flow meter requires fluids with a minimum conductivity of 5 microsiemens/cm.

• It cannot measure non-conductive fluids like oils and hydrocarbons.

• It is also not suitable for fluids with high viscosity or those containing solids.

• Mag flow meter may require frequent calibration to maintain accuracy.

• It is relatively expensive compared to other flow meters.

Zener diode is a type of diode that allows current to flow in the reverse direction when a certain voltage is reached.

• Zener diodes are heavily doped with impurities to create a narrow depletion region.

• They are used as voltage regulators and in surge protection circuits.

• Zener voltage is the voltage at which the diode starts conducting in reverse direction.

• They have a sharp breakdown voltage and a high power dissipation capability.

• Zener diodes are commonly used in electronic ci...read more