Interview Questions and Answers

AI, AO, DI, DO signals are types of signals used in instrumentation engineering.

• AI stands for Analog Input and refers to signals that are continuous and can take any value within a range.

• AO stands for Analog Output and refers to signals that are continuous and can be controlled to produce a specific output value.

• DI stands for Digital Input and refers to signals that are discrete and can only take on two values, typically 0 or 1.

• DO stands for Digital Output and refers to signa...read more

Drum level maintenance differs in 3-element and single element systems.

• In 3-element systems, the drum level is controlled by measuring the water level, steam flow, and feedwater flow.

• In single element systems, only the water level is measured.

• Maintenance in 3-element systems involves checking and calibrating the sensors for each parameter.

• Maintenance in single element systems involves checking and calibrating the water level sensor.

• Regular maintenance is necessary to ensure a...read more

Interlocks are safety mechanisms that prevent the turbine from operating under unsafe conditions.

• Interlocks are designed to prevent damage to the turbine and ensure safe operation.

• They can be mechanical, electrical, or software-based.

• Examples include overspeed protection, low oil pressure shutdown, and high exhaust temperature shutdown.

• Interlocks are critical components of turbine control systems and must be properly maintained and tested.

• They are often required by regulatory...read more

Control valve troubleshooting involves identifying and resolving issues with the valve's performance.

• Check for any leaks or blockages in the valve

• Inspect the valve's positioner and actuator for any faults

• Verify that the valve is receiving the correct signals from the control system

• Check the valve's calibration and adjust if necessary

• Perform a functional test to ensure proper operation

Emerson DCS programming skills are essential for a Senior Instrumentation Engineer.

• Proficiency in programming languages such as ladder logic, function block, and sequential function chart

• Experience in configuring and programming Emerson DeltaV DCS systems

• Knowledge of Emerson AMS Device Manager software for device configuration and diagnostics

• Ability to troubleshoot and debug DCS programming issues

• Familiarity with industry standards such as ISA-88 and ISA-95

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Consists of two coils of wire, known as primary and secondary coils

• Primary coil receives electrical energy and creates a magnetic field

• Magnetic field induces a voltage in the secondary coil, transferring energy

• Used in power distribution, voltage regulation, and isolation

• Examples include step-up transformers for power transmission and step-down transformers...read more

Rankine cycle is a thermodynamic cycle used in power plants to convert heat into mechanical work.

• Rankine cycle is a thermodynamic cycle that converts heat into mechanical work.

• It consists of four main components: a pump, a boiler, a turbine, and a condenser.

• The cycle starts with the pump sending liquid water to the boiler where it is heated and converted into high-pressure steam.

• The high-pressure steam then enters the turbine where it expands, producing mechanical work.

• After ...read more