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1.

Chapter 1. Introduction to Leak Testing
Part 1. Nondestructive Testing:
What is the primary definition of nondestructive testing (NDT)?

 a. Examination of medical samples

 b. Inspection of materials without impairing future usefulness

 c. Inspection of materials by destroying the test object

 d. Visual examination of industrial components

2.

Part 3. History of Leak Testing
What was the primary method of leak testing before the mid-1600s?

 A. Mass spectrometry

 B. Visual inspection

 C. Ultrasonic testing

 D. Thermal conductivity

3.

Part 4. Units of Measure for Nondestructive Testing
What is the main purpose of the International System of Units (SI)?

 A) To confuse scientists

 B) To establish a single set of measurement units

 C) To promote obsolete centimeter-gram-second units

 D) To use different units for different scientific specialties

4.

Chapter 2. Tracer Gases in Leak Testing
Part 1. Introduction to Properties of Tracer Gases for Leak Testing
What are the three categories of leak testing mentioned in Chapter 2?

 A) Leak detection, volume measurement, pressure location

 B) Leak detection, leak location, leakage measurement

 C) Volume measurement, leak detection, pressure location

 D) Leak location, pressure measurement, volume detection

5.

Part 2. Mechanisms of Gaseous Flow through Leaks
What are the basic modes of gaseous flow through leaks?

 a) Viscous, transitional, and molecular

 b) Laminar, turbulent, and choked

 c) Permeation, adsorption, and dissociation

 d) Pressure, length, and cross-section

6.

Part 3. Practical Measurement of Leakage Rates with Tracer Gases:
What are the three basic types of gas flow through leaks in leak testing?

 A) Laminar, Turbulent, Molecular

 B) Viscous, Transitional, Molecular

 C) Permeation, Choked, Laminar

 D) Adsorption, Dissociation, Migration

7.

Part 4. Mathematical Theory of Gas Flow through Leaks
What are the two modes of mass transfer attributed to leakage in gas flow, as mentioned in the book?

 A) Viscous and turbulent

 B) Pneumatic and permeation

 C) Laminar and molecular

 D) Transition and choked

8.

Chapter 3. Calibrated Reference Leaks
Part 1. Calibrated Reference Leaks
What are physical leaks that are vital for checking leak detector performance and leak test sensitivity referred to as in the book?

 A) Tracer leaks

 B) Instrumentation leaks

 C) Calibrated leaks

 D) Reference leaks

9.

Part 2. Operation of Standard (Calibrated) Halogen Leaks
What is the main purpose of a halogen gas leak detector in the context of leak testing?

 A) To release halogen gas into the environment

 B) To compare unknown leakage rates

 C) To measure the atmospheric pressure

 D) To generate a vacuum

10.

Part 3. Operation of Standard (Calibrated) Helium Leaks
Why is it imperative to calibrate the entire leak-testing system and not just the leak-testing instrument?

 A) To ensure the accuracy of the leak testing instrument

 B) To determine the user’s ability to detect leakage

 C) To perform qualitative measurements of leakage rates

 D) To assess the effectiveness of the vacuum pump

11.

Part 4. Calibration of Standard Reference Leaks
What gases are mentioned as being functionally compatible with polymer permeation elements in commercially available calibrated leaks?

 A) Helium only

 B) Helium, argon, sulfur hexafluoride, and many refrigerants

 C) Helium and nitrogen only

 D) Helium and hydrogen only

12.

Chapter 4. Safety Aspects of Leak Testing
Part 1. General Safety Procedures for Test Personnel
What is the primary focus of safety rules in leak testing?

 a) Protection of equipment

 b) Protection of personnel and property

 c) Enhancement of testing efficiency

 d) Optimization of test conditions

13.

Part 2. Control of Hazards from Airborne Toxic Liquids, Vapors and Particles
What electronic instruments can be used for detecting toxic vapors or gases in a work area?

 a) Mechanical gauges

 b) Electronic instruments with detectors

 c) Manual sensors

 d) Visual indicators

14.

Part 3. Flammable Liquids and Vapors
What is the flash point of flammable liquids, as defined by the National Fire Protection Association?

 A. Below 100 °C (212 °F)

 B. Between 60 and 93 °C (140 and 200 °F)

 C. Below 60 °C (140 °F)

 D. Above 100 °C (212 °F)

15.

Part 4. Electrical and Lighting Hazards
What determines the degree of danger for flammable liquids?

 A. Boiling point

 B. Vapor pressure

 C. Autoignition temperature

 D. Flash point

16.

Part 5. Safety Precautions with Leak Testing Tracer Gases
What are the primary safety considerations when using tracer gases in leak testing?

 a. Toxicity and flammability

 b. Color and odor

 c. Temperature and pressure

 d. Humidity and concentration

17.

Part 6. Safety Precautions with Compressed Gas Cylinders
What is a crucial consideration when handling compressed gas cylinders for leak testing purposes?

 a. The cylinder’s color

 b. The type of gas contained

 c. Compliance with Interstate Commerce Commission regulations

 d. The cylinder’s weight

18.

Part 7. Safety Precautions in Pressure and Vacuum Leak Testing
What is the primary purpose of leak testing pressure vessels?

 A. Predicting safe performance

 B. Cleaning the vessel

 C. Enhancing vessel appearance

 D. Monitoring temperature

19.

Part 8. Preparation of Pressurized Systems for Safe Leak Testing
What are pressure vessels and pressurized systems designed to contain?

 A. Gases only

 B. Fluids at atmospheric pressure

 C. Fluids at low pressure

 D. Fluids at atmospheric or higher pressures

20.

Part 9. Exposure to Toxic Substances
What is the threshold limit value (TLV)?

 a. A legal limit for exposure to toxic substances

 b. A recommended upper limit or time-weighted average concentration

 c. A mandatory exposure limit for all workers

 d. A concentration specified for hazardous material transportation

21.

Chapter 5. Pressure Change and Flow Rate Techniques for Determining Leakage Rates
Part 1. Introduction to Pressure Instrumentation, Measurements and Analysis
What is the function of atmospheric air and nitrogen in leak testing?

 a. To create pressure barriers

 b. To measure fluid temperatures

 c. To generate fluid pressure differentials

 d. To determine leakage rates

22.

Part 2. Pressure Change Leakage Rate Tests in Pressurized Systems
When is the pressure change leak testing procedure primarily used?

 a. For locating individual leaks

 b. For measurement of temperature changes

 c. For measurement of system volume

 d. For leakage measurement in large systems

23.

Part 3. Pressure Change Tests for Measuring Leakage in Evacuated Systems
What is the upper limit of vacuum pressure based on popular usage?

 a. 101 kPa

 b. 1 atm

 c. 28 in. Hg

 d. 29 mm Hg

24.

Part 4. Flow Rate Tests for Measuring Leakage Rates in Systems near Atmospheric Pressure
What is the primary purpose of the flow measurement procedure in leakage testing?

 A) To locate leaks

 B) To determine the system volume

 C) To measure the rate of gas flow

 D) To pressurize the system

25.

Chapter 6. Leak Testing of Vacuum Systems
Part 1. The Nature of Vacuum
What is the definition of a vacuum as per the content?

 A) Absence of matter

 B) Absence of gas

 C) Absence of pressure

 D) Absence of electrons

26.

Part 3. Materials for Vacuum Systems
What is adsorption in the context of vacuum systems?

 A. Evaporation of gas

 B. Condensation of gas on a solid surface

 C. Pressure reduction in a vacuum chamber

 D. Spontaneous gas release

27.

Part 4. Vacuum System Maintenance and Troubleshooting
What is a critical factor in maintaining vacuum systems at satisfactory levels of performance?

 a. The age of the vacuum system

 b. The cleanliness of objects to be vacuum processed

 c. The complexity of the vacuum system

 d. The system’s automation level

28.

Part 5. Equipment and Techniques for Measuring Pressure in Vacuum Systems
What property of gases is used as the basis for measuring pressures in high-pressure vacuum gages?

 A) Thermal conductivity

 B) Ionization

 C) Pneumatic force

 D) Viscosity

29.

Part 6. Techniques for Detection of Large Leaks in Operating Vacuum Systems
What pressure range is considered for large leaks in vacuum systems?

 A) 1 to 10 Pa

 B) 10 to 100 kPa

 C) 0.1 to 1 torr

 D) 1 to 1000 Pa

30.

Part 7. Leak Testing of Vacuum Systems by Vacuum Gage Response Technique
What is the fundamental principle underlying leak testing by vacuum gauge response to tracer gases?

 A) Pressure variation

 B) System evacuation

 C) Temperature control

 D) Gas composition dependence

31.

Part 8. Leak Testing of Systems by Thermal Conductivity Techniques
In which modes can the thermal conductivity leak testing technique be employed?

 A) Pressurized system (detector probe) and evacuated system (tracer probe)

 B) Only in pressurized systems

 C) Only in evacuated systems

 D) Alternating between pressurized and evacuated systems

32.

Part 9. Leak Testing of Vacuum Systems by Ionization Gage or Pump Techniques
What is the primary principle behind the ionization gage technique for leak testing of pumped vacuum systems?

 A) Resistance measurement

 B) Ionization current measurement

 C) Pressure gradient analysis

 D) Thermal conductivity assessment

33.

Chapter 7. Bubble Testing
Part 1. Introduction to Bubble Emission Techniques of Leak Testing
What is the primary principle behind leak testing using the bubble test technique?

 A) Gas pressure is applied directly to the leak

 B) Detection liquid is applied to the gas source

 C) Pressure is reduced to detect leaks

 D) Gas leakage creates bubbles in the detection liquid

34.

Part 2. Theory of Bubble Testing by Liquid Immersion Technique
What is the primary application of the immersion technique of bubble testing for leaks?

 A. Sealed components testing

 B. Large vessel testing

 C. Gas flow rate measurement

 D. Surface tension analysis

35.

Part 4. Bubble Testing by Vacuum Box Technique
What is the primary purpose of vacuum box bubble testing?

 a. To check weld dimensions

 b. To detect through thickness discontinuities

 c. To measure pressure differentials

 d. To assess the material hardness

36.

Part 5. Procedures and Applications of Bubble Testing in Industry
What is a key advantage of bubble testing in leak detection?

 a. High cost

 b. Extensive training required

 c. Quick results and low cost

 d. Limited applications

37.

CHAPTER 8 Techniques and Applications of Helium Mass Spectrometry:
Part 1. Principles of Mass Spectrometer Leak Testing with Helium Tracer Gas
What is the primary principle behind mass spectrometer leak testing with helium tracer gas?

 A) Magnetic induction

 B) Gas Compression

 C) Passage of tracer gas through a leak

 D) Optical detection

38.

Part 2. Tracer Probe Technique for Leak Testing of Evacuated Objects1,2
In helium leak testing of evacuated objects, what is the primary purpose of a manually held helium spray probe?

 A) To scan external surfaces for leaks

 B) To provide high vacuum

 C) To pump down the system

 D) To control helium flow rate

39.

Part 3. Hood Technique for Leak Testing of Evacuated Objects2,3
In the hood technique for leak testing evacuated objects, what gas is used to detect leaks?

 A) Nitrogen

 B) Oxygen

 C) Helium

 D) Hydrogen

40.

Part 5. Detector Probe Technique for Leak Testing of Pressurized Objects3,4
Question: What is the purpose of throttling the system mechanical pumps in helium mass spectrometer leak testing?

 a. To increase system pressure

 b. To decrease system throughput

 c. To decrease instrument sensing element pressure

 d. To achieve a higher portion of the system diffusion pump throughput backed by the helium mass spectrometer

41.

Part 6. Bell Jar Technique for Leak Testing of Pressurized Objects5
What is the primary advantage of the bell jar technique in leak testing sealed components?

 a. Fast pumping time

 b. Low sensitivity

 c. High sensitivity

 d. Minimal equipment requirement

42.

Part 7. Accumulation Technique for Leak Testing of Pressurized Objects
What is the purpose of the bell jar technique in helium leak testing?

 A) To detect helium leaks from sealed units

 B) To evacuate the test chamber

 C) To pressurize the test object

 D) To measure the pump-down time

43.

Chapter 9. Mass Spectrometer Instrumentation for Leak Testing
Part 1. Principles of Detection of Helium Gas by Mass Spectrometers
Why is helium commonly used as a tracer gas for leak testing?

 A) It is reactive with metals

 B) It is heavy and stable

 C) It diffuses slowly through leaks

 D) It is toxic

44.

Part 2. Sensitivity and Resolution of Mass Spectrometer Helium Leak Detectors
What are the key factors influencing the sensitivity and resolution of helium mass spectrometer leak detectors in the industry?.

 A) Gas color and temperature

 B) Spectrometer tube length

 C) Leak detector brand

 D) Design and operating factors

45.

Part 3. Operation and Maintenance of Mass Spectrometer Vacuum System
What occurs after ions pass through the ground potential exit slit of the ionization chamber in the spectrometer?

 a) Ionization of helium atoms

 b) Circular path deflection

 c) Travel through a cold cathode

 d) Compression by a diffusion pump

46.

Chapter 10. Leak Testing with Halogen Tracer Gases
Part 1. Introduction to Halogen Tracer Gases and Leak Detectors
Which of the following halogens is NOT commonly used as a tracer gas in leak detectors?

 A) Chlorine

 B) Fluorine

 C) Bromine

 D) Iodine

47.

Part 2. Introduction to Techniques of Halogen Leak Testing
What components are typically included in a halogen leak detector system?

 a) Halogen sensing element, power supplies, and amplifiers

 b) Halogen, air pump, and a leak signal lamp

 c) Tracer gas, probe, and a variable frequency audio signal

 d) Halogen mixture, vacuum system, and a closed-loop control unit

48.

Part 3. Recommended Techniques for Pressure Leak Testing with Halogen Detector Probe
What is the primary advantage of Method C (Shroud Test) for halogen leak testing?

 a) Automation of valving and material handling

 b) High sensitivity in factory environments

 c) Accurate location of large leaks

 d) Adaptability for testing small items

49.

Part 4. Industrial Applications of Halogen Leak Detection
What is the primary method used to test pressurized enclosures and piping for leaks in halogen leak detection?

 a) Ultrasonic testing

 b) Hydrostatic testing

 c) Heated anode halogen leak detectors

 d) Pressure drop testing

50.

Part 5. Writing Specifications for Halogen Leak Testing
What is the importance of writing realistic, concise, and meaningful leak specifications in the context of halogen leak testing?

 A. To impress customers

 B. To fulfill regulatory requirements

 C. To ensure proper manufacturing

 D. To avoid unnecessary paperwork

51.

Chapter 11. Acoustic Leak Testing
Part 1. Principles of Sonic and Ultrasonic Leak Testing
What is the primary purpose of airborne ultrasound detection in leak testing?

 A. Detecting leaks in evacuated systems

 B. Locating leaks in electrical components

 C. Identifying leaks in fluid systems

 D. Monitoring leaks in pressurized systems

52.

Part 3. Ultrasound Leak Testing of Pressurized Industrial and Transportation Systems
What is the primary advantage of using an artificial ultrasonic frequency tone generator for leak testing?

 A) It generates audible signals

 B) It provides a conical sound beam

 C) It reflects ultrasound signals

 D) It works only in pressurized systems

53.

Part 4. Ultrasound Leak Testing of Evacuated Systems
In which application has ultrasound detection proven to be a valuable supplement to the mass spectrometer for inspecting the integrity of vacuum enclosures?

 a. Steam turbine exhaust systems

 b. Marine propulsion units

 c. Evacuated electron tube water cooling circuits

 d. Air conditioning ducts

54.

Part 5. Ultrasound Leak Testing of Engines, Valves, Hydraulic Systems, Machinery and Vehicles
What advantage does ultrasound leak testing provide in fluid power networks, as illustrated in Figure 19?

 a. Detection of electromagnetic energy

 b. Ability to analyze fluid color

 c. Pinpointing bypassing discontinuities without disassembly

 d. Measurement of fluid pressure

55.

Part 6. Electrical Inspection
What is the primary cause of the intense, steep front sound waves generated during lightning, as mentioned in the text?

 a. Ionization of air

 b. Rapid expansion of water

 c. Ultrasonic vibration

 d. Atmospheric pressure changes

56.

Part 7. Ultrasound Leak Testing of Pressurized Telephone Cables
What was a traditional method for detecting leaks in aerial telephone cables before the introduction of ultrasound leak testing?

 a. Applying ultrasound signals

 b. Using bubble solution

 c. Applying gradient measurement techniques

 d. Utilizing pressure regulators

57.

Part 8. Acoustic Emission Monitoring of Leakage from Vessels, Tanks and Pipelines
What is the primary function of Acoustic Emission (AE) in leak detection applications?

 a. Measure temperature changes

 b. Detect, locate, and quantify leaks

 c. Monitor pressure changes

 d. Assess structural integrity

58.

Chapter 12. Infrared Thermographic Leak Testing
Part 1. Advantages and Techniques of Infrared Thermographic Leak Testing
What is the primary form of thermal radiation emitted by a body during infrared thermographic leak testing?

 a. Ultraviolet waves

 b. Visible light waves

 c. Infrared waves

 d. Microwave radiation

59.

Part 2. Infrared Leak Testing Using Emission Pattern Techniques
What is the primary principle of operation for an infrared thermographic imaging system during leak testing?

 a. Measurement of emitted energy from the ground surface

 b. Detection of electromagnetic waves

 c. Measurement of ground conductivity

 d. Assessment of soil composition

60.

Part 3. Leak Testing Using Infrared Absorption
When was the backscatter/absorption gas imaging (BAGI) technique developed, and by whom?

 a. 1970s, Chevron Corporation

 b. 1980s, United States Department of Energy

 c. 1990s, Metropolitan St. Louis Sewer District

 d. 2000s, American Society for Nondestructive Testing (ASNT)

61.

Part 4. Infrared Thermographic Leak Testing Using Acoustic Excitation
When was the photoacoustic effect first observed, and by whom?

 a. 1880, Alexander Graham Bell

 b. 1920, Albert Einstein

 c. 1950, Marie Curie

 d. 1970, Isaac Newton

62.

Chapter 13. Leak Testing of Petrochemical Storage Tanks
Part 1. Leak Testing of Underground Storage Tanks
Why is leak testing of petrochemical storage tanks a growing concern?

 a. High construction costs

 b. Environmental contamination risks

 c. Increased regulatory support

 d. Improved technology applications

63.

Part 3. Determining Leakage Rate in Petrochemical Structures
What is the purpose of the developer in the dye penetrant test?

 A) Enhance the color of the dye

 B) Accelerate the drying process

 C) Neutralize the dye

 D) Aid in the visual inspection

64.

Chapter 14. Leak Testing of Hermetic Seals
Part 1. Characteristics of Gasketed Mechanical Hermetic Seals
What is the strict definition of a hermetically sealed device or system?

 A) The complete absence of gases

 B) No interaction with external gases, vapors, or liquids

 C) Absolute vacuum within the system

 D) Sealed under extreme pressure

65.

Part 2. Characteristics of Hermetically Sealed Packages
What is the primary purpose of a hermetically sealed package for electronic devices?

 A) Mechanical stability

 B) Aesthetics

 C) Enhanced conductivity

 D) Increased weight

66.

Part 3. Techniques for Gross Leak Testing of Hermetically Sealed Devices
What is the gross end of the range of leakage rates for hermetic seals?

 A. 10–9 Pa·m3·s–1

 B. 10–7 Pa·m3·s–1

 C. 10–6 std cm3·s–1

 D. 10–8 Pa·m3·s–1

67.

What are the leaks in hermetic seals primarily composed of?

 A. Circular holes

 B. Pores of various sizes

 C. Cracks

 D. Micrometers

68.

Part 4. Fine Leak Testing of Hermetically Sealed Devices with Krypton-85 Gas
What are the two widely used fine leak test techniques for hermetic devices mentioned in the passage?

 A. Krypton-85 and Helium

 B. Radioisotope and Laser

 C. Helium and Neon

 D. Nitrogen and Oxygen

69.

Chapter 15. Leak Testing Techniques for Special Applications
Part 1. Techniques with Visible Indications of Leak Locations
What is the primary purpose of leak testing for locating individual leaks?

 A. To save costs

 B. To detect surface discontinuities

 C. To locate and evaluate each leak

 D. To enhance system functionality

70.

Part 2. Primary Containment Leakage Rate Testing in the United States Nuclear Power Industry
What is the primary purpose of the primary containment in the nuclear power industry?

 A. Energy generation

 B. Radioactive material barrier

 C. Heat dissipation

 D. Fuel storage

71.

Part 3. Leak Testing of Geosynthetic Membranes
What is the purpose of destructive seam testing in geosynthetic membrane installation?

 A. To evaluate seam continuity

 B. To monitor for leaks

 C. To ensure seam flexibility

 D. To test seam strength in the field

72.

Chapter 16. Leak Testing Glossary
What does the term “absolute pressure” in leak testing refer to?

 A. Pressure above atmospheric

 B. Pressure below absolute zero

 C. Pressure in a vacuum chamber

 D. Pressure in an enclosed space with molecules

73.

Chapter 17. Leak Testing
What organization published the “IEEE Standard Dictionary of Electrical and Electronic Terms”?

 A) American Vacuum Society

 B) Institute of Electrical and Electronics Engineers

 C) American Society for Testing and Materials

 D) Illuminating Engineering Society of North America

74.

What is the purpose of the article “Leak Testing of Aboveground Storage Tanks in Petroleum Refineries” by D.W. Northwood, R. Slawson, and S. Holder?

 A) Evaluation of field seams quality

 B) Leak detection in pipelines

 C) Leak testing of storage systems

 D) Leak testing of aboveground storage tanks

75.

What does the acronym UST stand for in the context of leak testing?

 A) Underground Storage Tank

 B) Ultrasonic Sensing Technology

 C) Ultraviolet Safety Test

 D) Underwater Seal Test

76.

What is the focus of the article “Infrared Techniques in Buildings and Structures: Operation and Maintenance” by S.Å. Ljungberg?

 A) Leak Testing Safety

 B) Thermographic Leak Testing

 C) Leak Testing of Storage Systems

 D) Optical Leak Testing

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ASNT NDT LT Exam Syllabus:

We are covering all the topics given below in this free practice test quiz course:

1. Chapter. Introduction to Leak Testing
2. Chapter. Tracer Gases in Leak Testing
3. Chapter. Calibrated Reference Leaks
4. Chapter. Safety Aspects of Leak Testing
5. Chapter. Pressure Change and Flow Rate Techniques for Determining Leakage Rates
6. Chapter. Leak Testing of Vacuum Systems
7. Chapter. Bubble Testing
8. Chapter. Techniques and Applications of Helium Mass Spectrometry
9. Chapter. Mass Spectrometer Instrumentation for Leak Testing
10. Chapter. Leak Testing with Halogen Tracer Gases
11. Chapter. Acoustic Leak Testing
12. Chapter. Infrared Thermographic Leak Testing
13. Chapter. Leak Testing of Petrochemical Storage Tanks
14. Chapter. Leak Testing of Hermetic Seals
15. Chapter. Leak Testing Techniques for Special Applications
16. Chapter. Leak Testing Glossary
17. Chapter. Leak Testing

ASNT NDT LT Exam Pattern:

• Exam: Leak Testing (LT)
• Number of Questions: 135
• Time: 4 hrs
• Certification: NDT Only

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