SECTION 6 - SAMPLING
คำชี้แจง
- ข้อสอบชุดนี้มีเพียง 20 ข้อ
- ถ้าไม่กรอกทั้งชื่อ และนามสกุลของผู้ทำข้อสอบ ระบบจะไม่ตรวจข้อสอบให้
- ผลสอบจะเก็บเพียง 300 ระเบียนสุดท้าย โดยเรียงจากเวลาล่าสุด
- ถ้าทำข้อสอบไม่ครบ ระบบจะไม่ตรวจข้อสอบให้
- ผู้ทำข้อสอบจะมีเวลาในการทำข้อสอบเพียง 30 นาที หากเกินเวลา ระบบจะไม่ตรวจข้อสอบให้
- เมื่อมีการตรวจคำตอบ ระบบจะบันทึกชื่อ และคะแนนลงฐานข้อมูล พร้อมเวลาเริ่มทำ และเวลาสิ้นสุด
- เกณฑ์ตัดสินผ่านการทดสอบอยู่ที่ร้อยละ 90 หรือ 18 ข้อขึ้นไป
หากต้องการพิมพ์ใบรับรองผลคะแนน โปรดใช้เครื่อง Computer ในการทดสอบและมีจำนวนข้อที่ใช้สอบจำนวน 20 ข้อขึ้นไป และจะแสดงผลสำหรับผู้ที่ผ่านเกณฑ์การสอบเท่านั้น โดยเกณฑ์การสอบอยู่ที่ร้อยละ 90 หรือ 18 ข้อขึ้นไป คลิกที่นี่เพื่อเพิ่มจำนวนข้อทดสอบ
1. 6.18 Why do sampling standards recommend that a vapour space should be left at the top of each sample container?
    a. To permit the surface of the liquid to be visible in the laboratory
    b. To allow space to test the vapour content of the sample
    c. To allow space for safe expansion of the liquid
    d. To avoid the loss of light components
2. 6.49 At what point is a bottom (dead-bottom) sample taken?
    a. 15 cm [6 inches] below the outlet
    b. 10 cm [4 inches] below the outlet
    c. At the lowest point in the tank
    d. Immediately above the free water level
3. 6.12 What type of equipment would you use to sample liquid in a 55-gallon drum?
    a. A dead-bottom sampler
    b. A bottle and cage.
    c. A sampling tube.
    d. A dipper sampler.
4. 6.11 Which equipment is best for sampling free water in a crude oil tank?
    a. Zone sampler
    b. Dead bottom sampler
    c. Bottle and sample cage
    d. Weighted bottle and cord
5. 6.72 According to IP476/ISO 3171 and API MPMS Ch 8.2, sampling in a time proportional mode is acceptable if the flow rate variation is less than ±10 percent of the average rate over the entire parcel.
    a. True
    b. False


6. 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
7. 6.06 Which product requires particular care when selecting a sample container?
    a. Gasoline
    b. Fuel oil
    c. Benzene
    d. Jet fuel
8. 6.14 When sampling volatile liquids, why is it generally better to use a sampling cage and bottle and not a weighted sampling can/beaker?
    a. The equipment is easier to handle
    b. A can sample is probably less representative
    c. Loss of light ends is likely when the sample is transferred from the can/beaker
    d. Sample bottles are readily available
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. 6.40 What is the principal reason for taking bottom (deadbottom) samples.
    a. To determine if sediment is present
    b. To obtain a sample for sulfur & viscosity determination
    c. To locate any free water not identified by water paste
    d. Bottom samples need not be taken if water paste indicates that no water is present
11. 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
12. 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
13. 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
14. 6.09 Jet fuel should not be sampled with equipment that contains brass, copper or copper alloy.
    a. True
    b. False


15. 6.60 When upper-middle-lower samples are taken from a tank, from what point is the lower sample taken?
    a. 1/3 of the liquid height from the tank bottom
    b. At the middle of the tank outlet fitting
    c. 1/6 of the liquid height from the tank bottom
    d. 150 mm off the tank bottom
16. 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
17. 6.24 After taking a spot sample of gasoline, it is permissible to immediately pour off some of the product to allow room in the container for expansion.
    a. True
    b. False


18. 6.78 Why is it important to label all samples as soon as possible?
    a. National and/or local Government regulations require it.
    b. An incorrectly labeled sample could generate a legal action
    c. It is easy to label samples incorrectly if they are not labelled promptly
    d. Answers a., b. and c. are all correct
19. 6.53 A bottom (dead bottom) sample may not always be taken at the very bottom of a tank. What is the correct procedure?
    a. Always specify the location where the sample was taken, for example Approximately 15 cm [6 inches] from the bottom
    b. Always take a bottom sample 5 cm [2 inches] off the actual bottom because that is where the neck of the bottle will rest when the bottle is on its side
    c. Always use a dead bottom sampler to draw bottom samples
    d. Always use a zone sampler to draw bottom samples
20. 6.31 Why should sampling cord not be allowed to fall on the deck or tank roof?
    a. It could become contaminated
    b. It could make a mess that could cause a danger of slipping
    c. The cord could become damaged
    d. Answers a. and b. are correct
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