Sampling principles for solids, liquids and gases and hazards of sampling - One Line Questions

1. What is a 'composite sample'? — A sample formed by mixing multiple increments
2. What is meant by 'sampling error'? — The difference between the sample composition and the true composition of the lot
3. What is the primary hazard when sampling compressed gases? — Sudden release of high-pressure gas
4. When sampling gases that are heavier than air, where is the most appropriate sampling point usually located? — At the bottom of the container
5. What is the primary hazard associated with sampling powdered materials that can become airborne? — Inhalation of toxic dust
6. Which hazard is most associated with sampling cryogenic liquids? — Extreme cold causing burns or frostbite
7. When sampling gases, what is a primary concern to prevent loss of volatile components? — Minimizing the contact time with the atmosphere
8. What is a fundamental principle of 'random sampling'? — Every part of the lot has an equal chance of being selected
9. What is a common hazard associated with sampling fine powders that are electrostatically charged? — Explosion due to static discharge igniting dust
10. What is a major hazard when sampling hot liquids? — Burns from hot liquid or steam
11. Which type of sampling is typically used for monitoring air quality over an extended period? — Composite sampling
12. What is a common hazard associated with sampling corrosive liquids? — Skin and eye burns
13. What is a key characteristic of a 'grab sample'? — It represents the composition at a specific point in time and space
14. What is the main disadvantage of using a 'grab sample' for a process that varies over time? — It does not represent the average composition
15. When collecting a gas sample in a cylinder, what is important to prevent? — Leakage from the cylinder
16. What is a significant hazard when sampling materials that can spontaneously combust? — Contact with air or moisture
17. Which factor is LEAST important when selecting sampling equipment for solids? — Aesthetic appearance of the equipment
18. When sampling gases, what is the primary concern with using a flexible plastic bag? — Permeation of gases through the bag material
19. What is a primary consideration for sampling gases at elevated temperatures? — Preventing condensation of components
20. What is a key challenge in sampling gases under high vacuum? — Preventing leakage into the sampling system
21. Which sampling principle is most crucial for ensuring a representative sample of a heterogeneous solid mixture? — Random sampling
22. Which of the following is a potential hazard when sampling highly viscous liquids? — Difficulty in obtaining a representative sample
23. Which of the following is a major hazard associated with sampling volatile organic compounds (VOCs) from liquids? — Exposure to toxic fumes
24. What is a potential hazard when sampling fine powders? — Risk of explosion from dust ignition
25. When sampling solids that can degrade upon exposure to air, what precaution is necessary? — Sample under an inert atmosphere
26. When sampling solids from bags or drums, what is a recommended practice to ensure representativeness? — Sample from multiple locations within the container
27. When sampling gases from a process stream, what is a critical factor to ensure the sample is representative? — Sampling at a point of turbulent flow
28. When sampling solids from a conveyor belt, what is the best practice for obtaining a representative sample? — Take a full cross-section of the material at regular intervals
29. Which sampling principle is often employed when a large batch of solid material is known to have distinct layers or regions? — Stratified sampling
30. Which sampling method is often used for large, static bodies of liquid like lakes or large tanks? — Stratified sampling
31. Which type of sampling is often used for large stockpiles of solid material? — Stratified sampling
32. Which sampling method involves taking samples at regular intervals from a moving stream of liquid? — Systematic sampling
33. Which type of sampling is suitable for a large pile of granular material where composition is expected to be uniform throughout? — Random sampling
34. Which sampling technique is best suited for a liquid with significant stratification (e.g., density differences)? — Zone sampling
35. Which sampling method is generally preferred for large volumes of liquid in a tank or vessel? — Zone or stratified sampling
36. What is the principle behind 'systematic sampling'? — Taking samples at fixed intervals of time or space
37. In sampling liquids, 'segregation' refers to: — The separation of components within the liquid
38. What does the term 'bias' in sampling refer to? —
39. What does 'representativeness' of a sample mean? — The sample accurately reflects the composition of the bulk material
40. What does 'sampling bias' imply? — The sampling method systematically favors certain parts of the material
41. The 'lot' in sampling refers to: — A specific batch or quantity of material being sampled
42. When sampling solids, what is the purpose of 'increment'? — A single small portion taken from a larger mass
43. What is the primary goal of a 'representative sample'? — To accurately represent the composition of the entire lot
44. What is the main objective of 'sub-sampling'? — To reduce the bulk sample to a manageable size for analysis
45. In liquid sampling, what is the purpose of a 'dipper' or 'bailer'? — To collect a sample from a specific depth
46. What is the purpose of 'homogenization' in sampling? — To make the sample uniform in composition
47. For a liquid sample, what is a common method to avoid contamination during sampling? — Using clean, inert sampling equipment
48. What is a critical safety consideration when sampling flammable liquids? — Using non-sparking tools and grounding equipment
49. Which factor is most important for preventing cross-contamination when sampling different batches of solids? — Thoroughly cleaning and drying sampling equipment between batches
50. What is a key safety precaution when sampling materials that are radioactive? — Minimizing exposure time and maximizing distance
All One Line Questions
E-Book Sampling principles for solids, liquids and gases and hazards of sampling Online Test Sampling principles for solids, liquids and gases and hazards of sampling Question Bank Sampling principles for solids, liquids and gases and hazards of sampling