Interview Questions on Instrumentation Part-1

Introduction: –

All listed questions are based on my own interview experience. so here are the Top Interview Questions on Instrumentation Part-1.

My goal is to make instrument engineers capable enough to get their field job.

In this move, I will try to give all materials and references for getting your best job in the instrumentation field.

Top Interview Questions on Instrumentation Part-1

1. Define instrumentation?

Ans: –

Instrumentation is a combination of measuring instruments that indicate, measure, and record process variables in industries.

2. What is RTD? Explain.

Ans: –

RTD is a resistance temperature detector. It works on the principle of change in resistance due to temperature change.

And it has a positive temperature coefficient which means when temperature increases the Value of resistance increases.

3. What are sensors and types of sensors?

Ans: –

A sensor is a device that takes physical input from the environment and converts it into a single device that humans or machines will interact with.

4. What is the difference between Transducer, Sensor, Transmitter, And converter?

Ans: –

1. Transducer

A transducer is a device that converts one type of energy signal into another type of energy signal. Ex- LVDT is a transducer it converts mechanical movement into electrical output.

2. Sensor

A sensor is a device that takes physical input from the environment and converts it into a single one that humans or machines will interact with. Ex- Proximity sensor

3. Transmitter

A transmitter is a device that applies signal conditioning and scaling on the transducer signal and converts it into the industrial stranded signal.

Ex- temperature transmitter that converts thermocouple millivolt signal into 4-20mA signal

4. Converter

The converter is responsible for converting one type of industrial standard signal into another type of industrial standard signal.

The Ex- I/p converter converts a 4-20mA signal into a 3-15psi pressure signal.

5. What is the difference between converter and transmitter?

Ans: –

1. Transmitter

A transmitter is a device that applies signal conditioning and scaling on the transducer signal and converts it into the industrial stranded signal.

Ex- temperature transmitter that converts thermocouple millivolt signal into 4-20mA signal

2. Converter

The converter is responsible for converting one type of industrial standard signal into another type of industrial standard signal.

The Ex- I/p converter converts a 4-20mA signal into a 3-15psi pressure signal.

5. Why does the industry use a 4-20mA standard signal instead of 0-20mA?

Ans: –

In 0-20mA signal Controller does not distinguish between the Control signal or Cable break, when a 4-20mA signal is used instead of 0-20mA When the controller gets a 0mA signal then the controller easily finds out it is a wire Fault.

6. What is signal conditioning?

Ans: –

Signal conditioning is a process of manipulating an analog signal in such a way that signal meets its requirement according to need.

7. Output of thermocouple?

Ans: –

The output of the thermocouple is in mV (Millivolt) on the principle of the see-back effect. The inverse effect of the see-beck effect is the Peltier effect.

8. Types of Level, Flow, Temperature, and Pressure Transmitter?

Ans: –

1. Level

• Capacitive type
• Ultrasonic type
• Radar type
• Radiation type
• Differential pressure type

2. Flow

• Magnetic type
• Vortex type
• Ultrasonic type
• venturi type
• Pitot type
• Orifice type
• Turbine type
• Coriolis mass flow type
• Thermal mass flow type

3. Temperature

• Thermocouple type
• RTD type

4. Pressure

• Differential pressure type

9. Types of orifice Plats?

Ans: –

• Concentric
• Eccentric
• Segmented