Gharda Chemicals Limited 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, conside...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

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 ...read more