Instrumentation Questions

Top 25 Essential MCQ for Gas Analyzer Instrument Technician Interview

February 19, 2025

111

Welcome to the Gas Analyzer Instrument Technician Quiz! Designed for professionals in process industries, this advanced quiz features 25 multiple-choice questions to test your knowledge of gas analyzers, their principles, applications, and troubleshooting. Whether you are preparing for an interview or enhancing your expertise, this quiz covers calibration, maintenance, safety protocols, and industry standards. Each question is accompanied by a detailed explanation to help you understand the concepts better. Challenge yourself and see how well you know the intricacies of gas analyzer systems. Let’s dive in and assess your readiness for the role of a Gas Analyzer Instrument Technician!

Top 25 Essential MCQ for Gas Analyzer Instrument Technician Interview

Ready to test your skills as a Gas Analyzer Instrument Technician? This quiz features 25 advanced MCQs tailored for process industries. From calibration to troubleshooting, these questions will challenge your knowledge and prepare you for interviews. Each answer includes an explanation to deepen your understanding. Let’s begin and see how well you know gas analyzer systems!

1 / 25

What is the purpose of a permeation tube in gas analyzer calibration?

To generate a precise concentration of gas for calibration

To increase gas pressure

To cool the gas sample

To filter particulates

Permeation tubes release a controlled amount of gas, providing a known concentration for accurate calibration.

2 / 25

Which gas analyzer is suitable for detecting hydrogen (H2)?

Thermal conductivity detector (TCD)

IR analyzer

Paramagnetic analyzer

UV analyzer

TCDs are ideal for detecting hydrogen due to its high thermal conductivity compared to other gases.

3 / 25

What is the purpose of a catalytic bead sensor in gas analyzers?

To detect combustible gases

To measure oxygen levels

To filter particulates

To cool the gas sample

Catalytic bead sensors detect combustible gases by measuring the heat generated when the gas reacts with a catalyst, causing a change in resistance.

4 / 25

What is the purpose of a data logger in gas analyzer systems?

To record gas concentration data over time

To increase gas pressure

To cool the gas sample

To filter particulates

Data loggers store gas concentration readings for analysis and compliance reporting.

5 / 25

Which gas analyzer is used for detecting chlorine (Cl2)?

Electrochemical sensor

IR analyzer

Paramagnetic analyzer

UV analyzer

Electrochemical sensors are commonly used for detecting toxic gases like chlorine.

6 / 25

What is the purpose of a flow meter in gas analyzer systems?

To measure gas flow rate

To increase gas pressure

To cool the gas sample

To store gas samples

Flow meters ensure the gas sample is delivered at the correct flow rate for accurate analysis.

7 / 25

Which gas analyzer is suitable for detecting carbon dioxide (CO2)?

IR analyzer

Electrochemical sensor

Paramagnetic analyzer

UV analyzer

CO2 absorbs infrared light, making IR analyzers ideal for its detection.

8 / 25

What is the purpose of a desiccant in gas analysis?

To remove moisture from the gas sample

To increase gas pressure

To cool the gas sample

To filter particulates

Desiccants absorb water vapor, ensuring the gas sample is dry for accurate analysis.

9 / 25

Which gas analyzer is used for detecting ammonia (NH3)?

Electrochemical sensor

IR analyzer

Paramagnetic analyzer

UV analyzer

Ammonia absorbs infrared light, making IR analyzers suitable for its detection.

10 / 25

What is the purpose of a bypass flow in gas analyzer systems?

To increase gas pressure

To divert excess gas flow

To reduce gas flow rate

To store gas samples

Bypass flow ensures only the required amount of gas reaches the analyzer, preventing overloading.

11 / 25

Which gas analyzer is suitable for detecting sulfur dioxide (SO2)?

UV analyzer

IR analyzer

Electrochemical sensor

Paramagnetic analyzer

UV analyzers detect SO2 by measuring its absorption of ultraviolet light.

12 / 25

What is the purpose of a moisture trap in gas analysis?

To remove water vapor from the gas sample

To increase gas pressure

To cool the gas sample

To filter particulates

Moisture traps prevent water vapor from interfering with the gas analysis, ensuring accurate readings.

13 / 25

Which gas analyzer is used for detecting nitrogen oxides (NOx)?

Chemiluminescence analyzer

IR analyzer

Paramagnetic analyzer

UV analyzer

Chemiluminescence analyzers are highly sensitive to NOx and are commonly used in environmental monitoring.

14 / 25

Which gas analyzer is suitable for detecting methane (CH4)?

IR analyzer

Electrochemical sensor

Paramagnetic analyzer

UV analyzer

Methane absorbs infrared light at specific wavelengths, making IR analyzers ideal for its detection.

15 / 25

What is the significance of response time in gas analyzers?

It indicates the time taken to warm up the analyzer

It measures the time taken to detect and display gas concentration

It determines the lifespan of the analyzer

It calculates the gas flow rate

Response time is critical for real-time monitoring and ensuring timely detection of gas leaks or changes in concentration.

16 / 25

Which gas analyzer is used for measuring carbon monoxide (CO)?

Electrochemical sensor

IR analyzer

Paramagnetic analyzer

UV analyzer

Electrochemical sensors are commonly used for detecting CO due to their high sensitivity and specificity.

17 / 25

What is the purpose of a flame arrestor in a gas analyzer system?

To increase gas flow

To prevent explosions

To cool the gas sample

To filter particulates

Flame arrestors are safety devices that prevent flames from propagating back into the analyzer or sampling system.

18 / 25

What is the purpose of a span gas in calibration?

To simulate zero gas conditions

To provide a known concentration of gas for calibration

To clean the sampling lines

To test the analyzer’s temperature range

Span gas is used to calibrate the analyzer at a specific concentration, ensuring accurate measurements.

19 / 25

Which gas analyzer is suitable for detecting hydrogen sulfide (H2S)?

Electrochemical sensor

IR analyzer

Paramagnetic analyzer

UV analyzer

Electrochemical sensors are commonly used for detecting toxic gases like H2S due to their specificity and sensitivity.

20 / 25

What is the role of a sample conditioning system in gas analysis?

To increase gas pressure

To remove impurities and adjust gas conditions

To reduce gas flow rate

To store gas samples

Sample conditioning systems ensure the gas sample is clean, dry, and at the right temperature and pressure for accurate analysis.

21 / 25

Which gas analyzer is used for detecting hydrocarbons?

Electrochemical sensor

Flame ionization detector (FID)

Paramagnetic analyzer

Thermal conductivity detector

FIDs are highly effective for detecting hydrocarbons due to their high sensitivity and selectivity.

22 / 25

What is a common challenge in maintaining gas analyzers in process industries?

High power consumption

Contamination of sampling lines

Excessive noise

Low sensitivity

Contamination can lead to inaccurate readings, making regular cleaning and maintenance essential.

23 / 25

Which gas analyzer is best suited for measuring oxygen levels?

Paramagnetic analyzer

IR analyzer

Flame ionization detector (FID)

UV analyzer

Paramagnetic analyzers are highly sensitive to oxygen due to its magnetic properties.

24 / 25

What is the purpose of zero and span calibration in gas analyzers?

To adjust temperature settings

To ensure accuracy and reliability

To increase gas flow rate

To change the gas type

Zero calibration sets the baseline, while span calibration adjusts the analyzer to a known gas concentration, ensuring accurate readings.

25 / 25

Which principle is used in Infrared (IR) gas analyzers?

Electrochemical sensing

Absorption of IR radiation

Thermal conductivity

Paramagnetic properties

IR gas analyzers detect gases by measuring the absorption of infrared light at specific wavelengths, which is unique to each gas.

Your score is

The average score is 78%

Click here for More Instrumentation and control Quiz

Facebook

Twitter

Previous articleFactory Acceptance Test(FAT) Procedure for Differential Pressure(DP) Transmitter

Next articleStep-by-Step Guide: Installing & Removing a DP Transmitter with a 5-Way Valve Manifold

Sundareswaran Iyalunaidu

With over 24 years of dedicated experience, I am a seasoned professional specializing in the commissioning, maintenance, and installation of Electrical, Instrumentation and Control systems. My expertise extends across a spectrum of industries, including Power stations, Oil and Gas, Aluminium, Utilities, Steel and Continuous process industries. Tweet me @sundareshinfohe

Twitter

Search for an article