SECTION 6 - SAMPLING
คำชี้แจง
- ถ้าไม่กรอกทั้งชื่อ และนามสกุลของผู้ทำข้อสอบ ระบบจะไม่ตรวจข้อสอบให้
- ผลสอบจะเก็บเพียง 300 ระเบียนสุดท้าย โดยเรียงจากเวลาล่าสุด
- ถ้าทำข้อสอบไม่ครบ ระบบจะไม่ตรวจข้อสอบให้
- ผู้ทำข้อสอบจะมีเวลาในการทำข้อสอบเพียง 30 นาที หากเกินเวลา ระบบจะไม่ตรวจข้อสอบให้
- เมื่อมีการตรวจคำตอบ ระบบจะบันทึกชื่อ และคะแนนลงฐานข้อมูล พร้อมเวลาเริ่มทำ และเวลาสิ้นสุด
- เกณฑ์ตัดสินผ่านการทดสอบอยู่ที่ร้อยละ 90 หรือ 45 ข้อขึ้นไป
หน้าแรก ข้อสอบใหม่ สร้างใหม่ เฉลยข้อสอบ
หากต้องการพิมพ์ใบรับรองผลคะแนน โปรดใช้เครื่อง Computer ในการทดสอบ
INSERT เกิดข้อผิดพลาด You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'lower' sample is taken from?', 'a. The bottom of the tank','b. Just above the wa' at line 1
1. 6.13 Which of the following samples could be taken with a zone sampler?
    a. U, M, L samples
    b. Running samples
    c. Spot samples
    d. Answers a., and c. are correct
2. 6.41 If the sample bottle comes up full when taking a running sample what action should be taken?
    a. Pour out 20% - 25% of the sample, then cap and label the sample
    b. Cap and label sample then place it in an ice chest
    c. Make a special notation on the sampling report
    d. Discard the sample and re-sample the tank so that the bottle is about 80% full
3. 6.44 A sample can or bottle should never be capped if it is more than 95% full.
    a. True
    b. False


4. 6.22 Before sampling a clean product or petrochemical, the container should always be rinsed with the product when possible.
    a. True
    b. False


5. 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
6. 6.34 When sampling a shore tank containing a product with an observed density of 1100 kg/m3, [API -2°] and the main concern is water, where would the water proabably be found?
    a. 15 cm [6 ] off the bottom
    b. Stratified between the lower and middle levels
    c. Floating on top of the cargo
    d. No water can be found in oils with a density greater than 1000 kg/m3[with negative API]
7. 6.75 When taking samples for vapour pressure testing, samples must not be composited.
    a. True
    b. False


8. 6.61 When drawing upper-middle-lower samples from any tank, which sample should be taken first?
    a. Lower
    b. Middle
    c. Upper
    d. It doesn t matter
9. 6.43 Samples should not be taken from an unslotted or unperforated standpipe.
    a. True
    b. False


10. 6.69 The sample receiver of an automatic sampling system must be inspected to ensure that it is clean and dry before it is used.
    a. True
    b. False


11. 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
12. 6.58 Where is an upper sample taken from?
    a. The surface of the liquid
    b. 150 mm [6 inches] below the surface of the liquid
    c. The mid-point of the upper third of the liquid
    d. Anywhere in the top portion of the tank
13. 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
14. 6.33 Which of the following statements is correct?
    a. Closed and restricted sampling equipment is essentially the same
    b. Restricted sampling equipment may allow small amounts of vapour to escape to atmosphere
    c. Closed sampling equipment is designed to prevent any escape of vapour to atmosphere
    d. Answers b. and c. are correct
15. 6.10 What equipment is preferred to lower a sample bottle to the required level?
    a. Ullage tape
    b. Natural fibre cord or non-sparking chain marked to indicate when the correct level has been reached
    c. Innage tape
    d. Brass sampling cage
16. 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


17. 6.64 When drawing upper-middle-lower samples from any tank, which sample should be taken second?
    a. Lower
    b. Middle
    c. Upper
    d. It doesn t matter
18. 6.35 Why is a running sample not acceptable if the container is brought up full?
    a. There is no way to tell when the bottle filled up
    b. There would be too much oil to test the density
    c. There is a chance of contamination from the bottle cap
    d. As the bottle warms up, it could shatter
19. 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
20. 6.83 According to ISO 3171 and API Chapter 8.2 what is the number of grabs suggested when using an automatic sampler for transfers lasting over 6 hours?
    a. 100,000
    b. 10,000
    c. 1,000
    d. 100
21. 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.
22. 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%
23. 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


24. 6.26 How is a running sample obtained?
    a. By lowering an unstoppered container from the top of the oil to the level of the outlet and returning it to the top of the oil at a uniform rate so that the container is about 80% full when withdrawn from the oil.
    b. By lowering a stoppered container to the level of the outlet, then opening the sampler and raising it at a uniform rate so that it is about 80% full when withdrawn from the oil.
    c. By lowering a stoppered beaker to the bottom of the tank contents, then opening the sampler and raising and lowering it at a uniform rate until it is full.
    d. By lowering a stoppered beaker to the bottom of the tank contents, then opening the sampler and raising and lowering it at a uniform rate until it is full.
25. 6.54 Where is a 'lower' sample is taken from?
    a. The bottom of the tank
    b. Just above the water level
    c. The mid-point of the bottom third of the liquid
    d. At the level of the tank outlet/inlet pipe