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 27 ข้อขึ้นไป
หากต้องการพิมพ์ใบรับรองผลคะแนน โปรดใช้เครื่อง Computer ในการทดสอบ
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1. 6.36 What laboratory test will most likely be affected by not using dedicated sampling equipment for individual products or product groups?
    a. colour
    b. flashpoint
    c. sulphur
    d. Answers a., b. and c. are all correct
2. 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
3. 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
4. 6.65 At what vertical location in the liquid is an upper sample taken?
    a. 1/6 of the liquid depth below the surface of the liquid
    b. 25 mm [1 inch] below the surface of the liquid
    c. 150 mm [6 inches] below the surface of the liquid
    d. The middle of the lower third of the tank
5. 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
6. 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
7. 6.52 At what level in a product tank is a top sample taken?
    a. Middle of the upper third of the liquid
    b. 15 cm [6 inches] above the tank outlet
    c. Middle of the lower third of the tank
    d. 15 cm [6 inches] below the surface of the liquid
8. 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
9. 6.50 What is the name for a sample taken at a specific point in a tank?
    a. An all level sample
    b. A running sample
    c. A spot sample
    d. A single-tank composite sample
10. 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
11. 6.71 The controller on an automatic sampler is a device that governs the operation of the sample extractor.
    a. True
    b. False


12. 6.42 When taking a running sample of a clear product such as jet fuel or a water-white chemical what procedure should you follow?
    a. Rinse the inside of the sample bottle with product prior to taking the sample
    b. Take a sample in a clear bottle to visually check the colour
    c. Ensure that product running down the sample cord cannot contaminate the sample
    d. Answers a., b. and c. are all correct
13. 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