Question 1

What are the common types of flow characteristics in a control valve?

Accepted Answer

These are of 3 types. The first is a quick-opening characteristic for shut-off service. If piping and downstream equipment cause significant system resistance, same % renders better control. If maximum pressure drop is taken through the valve and upstream pressure is constant, a linear characteristic renders better control.

Question 2

Difference between balanced and unbalanced valves?

Accepted Answer

For proper valve functioning, outlet balancing is required as outlet pressure is more than 25% of the inlet pressure. When outlet pressure is higher than inlet pressure, a closed poppet can be pushed up off the internal orifice by the back pressure on the valve. Outlet balancing further prevents backpressure from acting on poppet.

Question 3

What is Instrumentation Engineering?

Accepted Answer

Instrumentation engineering involves designing, maintaining, and implementing instruments for accurate measurement and control in industrial processes, ensuring efficient operations and precise outcomes.

Question 4

How to Prepare for an Instrumentation Interview?

Accepted Answer

Prepare for an instrumentation interview by understanding core concepts, practicing problem-solving, and showcasing real-world projects. Utilize online resources like Firstnaukri for comprehensive interview preparation guides and tips.

Question 5

Explain PID Control in Instrumentation.

Accepted Answer

Answer: PID control (Proportional-Integral-Derivative) adjusts process variables by considering proportional, integral, and derivative terms. It maintains desired setpoints, enhancing accuracy and stability in industrial systems.

Question 6

What is the difference between PLC and DCS Systems?

Accepted Answer

PLCs (Programmable Logic Controllers) control discrete processes, while DCS (Distributed Control Systems) manage complex continuous operations. PLCs are suitable for simpler tasks, whereas DCS handles intricate industrial processes.

Question 7

What is the importance of Instrumentation in Industries?

Accepted Answer

Instrumentation is vital in industries for accurate process control, measurement, and monitoring. It ensures product quality, safety, and operational efficiency by maintaining optimal conditions and minimizing errors.

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