Miscellaneous Questions

Miscellaneous Questions

Answers to these questions will be given in the May issue of this journal.

Question 1. When fire is burning in a sprinklered building, where are the first lines usually stretched?

Question 2. What is the chief advantage of standpipes in fire fighting?

Question 3. When fire is burning above the third floor of a building equipped with standpipe system, which engine company connects to the standpipe at the street Siamese?

Question 4. What two types of foam fire extinguishing systems are there now in use?

Question 5. Name two materials which, when burning, make fires that cannot readily be extinguished by foam?

Question 6. For what type of hazard is the carbon dioxide extinguishing system particularly effective?

Question 7. Which have the greater range: carbon dioxide streams or foam streams?

Question 8. In general, what type of water stream is best for large, hot fires?

Question 9. As a general rule, on which side of an open fire should major fire fighting operations be carried on, i. e., the leeward or windward side?

Question 10. State two instances where the rule in Question 9 could not be followed.

Question 11. Conditions permitting, on which side of an inside fire is it best to operate?

Question 12. What is meant by “ventilating” a building?

Question 13. What is meant by “mushrooming”?

Question 14. What is the most effective way of checking mushrooming?

Question 15. What points must be considered when ventilating a building?

Question 16. If, when ventilating a burning building, you find no scuttles, skylights or other coverings to open, what would you do?

Question 17. When cutting a hole in a roof for ventilation, what precautions would you take?

Question 18. In ventilating a room, how should windows be opened? How. when ventilating a floor?

Question 19. At what point in a building does the work of ventilating usually start?

Question 20. Before putting a Hale door opener into operation to force a door, what should he done?

Question 21. An engine is pumping through 400 feet of 3-inch hose equipped with 1 1/4-inch nozzle. Engine pressure is 150 pounds. Find (a) Nozzle Pressure; (b) Friction loss; (c) Discharge.

Question 22. In what lengths are scaling ladders usually made?

Question 23. What is the purpose of the hook ladder?

Question 24. What is the distance, approximately, between rungs on a ladler?

Question 25. What is the principal use of the pompier ladder?

Question 26. For what is the hydrant force pump used?

Question 27. Why is it dangerous to spill sulphuric acid on the fire station floor?

Question 28. What appliance is used to prevent spillage of acid from carboys when recharging extinguishers?

Question 29. To what use are heavy screw jacks put by fire departments?

Question 30. Name three substances employed to prevent the water in hydrant barrels from freezing.

Question 31. How could you determine whether or not water was frozen in a hydrant barrel?

Question 32. How should a high-pressure hydrant with independent gate be opened?

Question 33. Name two types of fire hydrants?

Question 34. What is meant by a “compression” hydrant, and how does it operate?

Question 35. What is the function of the drip valve on a fire hydrant?

Question 36. Does the taper of a fire nozzle have any effect on the range of stream therefrom?

Question 37. What is meant by a “play pipe”?

Question 38. For what purpose are vanes placed in some nozzles?

Question 39. What is the formula for determining the reaction (or “back kick”) at a nozzle from a fire stream?

Question 40. Is the reaction apt to be greater on a shut-off nozzle when opened quickly than on the same size open nozzle?

Question 41. What is the chief precaution to observe in the operation of a controlling nozzle?

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