TB 7- Spray Nozzles

Question 1

Water has a great cooling effect because it expands____ to 1

Answer 1

1700

Question 2

Physical differences between spray streams in standard straight streams include

Answer 2

Size of water droplets
Shape of stream
Effective reach

Question 3

All of the following are true of a spray nozzle

Answer 3

Less reach and less penetration

Excessive pressure breaks of spray quicker

Question 4

Spray streams have greater____coverage so less movement is required?

Answer 4

Angular

Question 5

1 gallon of water at 62° can absorb____BTU in changing to steam.

Answer 5

9330

Question 6

When changing 1 gallon of water to steam only 1250 BTU are being Utilized in raising the water temperature from 62 to ___?

Answer 6

212°F

Question 7

All the following is true about using a spray nozzle

Answer 7

The fine spray limits the amount of water apply to the fire

Hand lines are easier to handle at higher psi

Question 8

What will a spray stream due to oxygen concentration?

Answer 8

Reduce the oxygen concentration

Question 9

Spray streams have considerably less reach due to the___which applies to the friction between air and water.

Answer 9

Skin friction

Question 10

The___Of water is generally more important than excess in___to produce a stream which will reach the seat of the fire

Answer 10

Volume – pressure