Ch. 5
- Extinguishers
Answer the following questions on a separate sheet of paper in full sentences. (55 marks)
Part A – define the following terms - numbers in parentheses represent page numbers in text
(1 mark each)
AFFF (128)
APW (127)
Hydrostatic test (138)
Part B – Short Asnwer
1. (8 marks)
Dry Chem agent (130)
Halon (129)
Incipient fires (125)
UL and ULC (134)
Ch. 5
- Extinguishers
Short Answer Cont’d.
1. Cont’d.
2. What types of portable extinguishers are used only on Class A fires? (127) (2 marks)
3. Identify the classes of fire which aqueous film forming foam extinguishers are unsuitable for . Explain
why. (128) (2 marks)
4. What are the advantages of halon extinguishers over other portable extinguishers? (129) (1 mark)
5. Why is it important to be extremely cautious with the handling of carbon dioxide extinguishers? (130)
(2 marks)
Ch. 5
- Extinguishers
6. Briefly explain how CO2 extinguishers work and why their use makes reignition of the fuel a danger
(130) (3 marks)
7. List the dry chemicals commonly used in dry chemical extinguishers (130) (2 marks)
8. Why should normal extinguishing agents not be used on Class D fires? (132) ( 1 mark)
9. Briefly explain how portable fire extinguishers are classified and rated (133,134) (5 marks)
10. Interpret the rating of a portable extinguisher that is marked 4-A 20-B:C. (134,135) (1 mark)
11. What are the two main considerations that must be addressed when choosing an extinguisher?
(136) (2 marks)
12. What should you do if a fire is still burning after you have entirely discharged an extinguisher? (137)
(1 mark)
13. Describe the PASS acronym used for fire extinguisher operations. (2 marks)
14. Identify the letter, graphic symbol, and pictograph of the five classes of fire, and provide a short
description of each. (10 marks)
Ch. 5
- Extinguishers
(6 marks)
Ch. 5
- Extinguishers