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SECTION 6 - SAMPLING

1. 6.47 During preliminary sampling of a shore tank that will be used to load a vessel, you should also obtain a tape or side gauge reading.
. a. True
. b. False
.
.
2. 6.01 Which industry documents describe the procedures for manual sampling of petroleum and petroleum products?
. a. API MPMS Chapter 17.1 / EI HM28
. b. IP 475 / API MPMS Chapter 8.1 / ISO 3170
. c. EI HM6 / API MPMS Chapter 8.2 / ISO 3171
. d. API MPMS Chapter 17.2
3. 6.79 When should a sample be labelled?
. a. On returning to the office
. b. After removing them from the sample transportation box.
. c. Just before leaving the facility
. d. Immediately after it is obtained
4. 6.59 Which of the following statements about upper, middle, and lower samples is correct?
. a. They can be taken in any order.
. b. They must be taken in the order lower, middle, upper.
. c. They must be taken in the order upper, middle, lower.
. d. They are less reliable than an all-levels sample, no matter how they are taken
5. 6.27 When sampling heavy fuel oil, crude oil or petroleum products in a tank with non-liquid or sediment deposits on the bottom, why may manual samples not be representative?
. a. Because the material may be non-homogeneous
. b. Because the concentration of entrained water is higher near the bottom
. c. Because the interface between the oil and water is difficult to measure accurately
. d. Answers a., b. and c. are all correct
6. 6.16 Why are free water samples important?
. a. To check for contaminated water under gasoline
. b. To determine the likely source of the free water
. c. To determining the influence of free water on the API gravity of a crude oil cargo
. d. Answers a., b. and c. are all wrong
7. 6.81 What is the most important feature of a container to be used for a sample of gasoline/naphtha for vapour pressure testing?
. a. It should be made of glass
. b. It should be made of plastic
. c. It should be made of metal
. d. It should be fitted with a vapour-tight lid
8. 6.17 A representative sample is a portion extracted from the total volume that contains its constituents in the same proportions as those present in the total volume.
. a. True
. b. False
.
.
9. 6.29 After obtaining a tank running sample, the inspector notices that the sampling bottle is full on withdrawing it from the tank. What should the inspector do?
. a. Pour some of the sample into a second container
. b. Pour some of the sample out of the bottle
. c. Retake the sample to comply with the method
. d. Answers a., b. or c. are all correct
10. 6.75 When taking samples for vapour pressure testing, samples must not be composited.
. a. True
. b. False
.
.
11. 6.74 What should be used to take a sample that is to be tested for vapour pressure?
. a. A zone sampler
. b. A glass bottle with suitable cage or weight
. c. A dedicated closed or restricted vapour pressure sampler
. d. Answers b. and c. are correct
12. 6.80 When drawing gasoline/naphtha samples for vapour pressure testing which comment(s) apply to the sample containers?
. a. They should be kept as cool as possible
. b. They should be filled to approximately 75% level
. c. They should be fitted with vapour tight lids
. d. Answers a., b. and c. are all correct
13. 6.77 When/where should samples be labeled?
. a. In the laboratory.
. b. Immediately after the sample is obtained.
. c. Before transportation to the laboratory.
. d. Immediately upon arrival in the laboratory
14. 6.32 For a running sample to be taken correctly, the sample container must be?
. a. At least half full
. b. A zone sampler
. c. A bottle and cage
. d. Approximately 70% to 85% full
15. 6.71 The controller on an automatic sampler is a device that governs the operation of the sample extractor.
. a. True
. b. False
.
.
16. 6.63 When drawing upper-middle-lower samples from any tank, which sample should be taken last?
. a. Lower
. b. Middle
. c. Upper
. d. It doesn t matte
17. 6.03 Which of the following types of sample container should be used to obtain an initial first foot sample?
. a. Clear glass bottles
. b. Amber glass bottles
. c. Plastic bottles
. d. Epoxy lined metal cans
18. 6.62 When upper-middle-lower samples are taken from a tank, what point is the upper sample taken from?
. a. 1/3 of the liquid height from the tank bottom
. b. At the middle of the tank outlet fitting
. c. At the middle of the upper third of the tank contents
. d. 15 cm [6 inches] off the tank bottom
19. 6.45 When taking liquid samples for hydrogen sulphide testing in accordance with IP 570 [ASTM D7621] what is the approximate level to which sample containers must be filled?
. a. 50%
. b. 80%
. c. 95%
. d. 100%
20. 6.25 How is an all-levels sample obtained?
. a. By submerging an unstoppered container at a uniform rate to a point near the tank draw-off level then raising it so that it is no more than 85% full on emerging from the liquid.
. b. By blending tank upper, middle and lower samples.
. c. By submerging a stoppered container to a point as near as possible to the draw-off (suction) level, then opening the sampler and raising it at a rate such that it is about 80% full on emerging from the liquid.
. d. By submerging a stoppered container to the bottom of the product in a tank, then opening the sampler and raising it at a uniform rate until the container is full.

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