Engine Company

Question 1

At the start of relay operation, all pumpers should be set to pump __ to the pumper at the fire

Answer 1

150 psi

Question 2

Incoming pressure to the next pumper in the relay should never drop below __

Answer 2

20 psi

Question 3

Excessively long relays, those exceeding __ may require relaying operations

Answer 3

1000 ft (up to 2000 ft max)

Question 4

Advantages of forward lay

Answer 4

• Company is self sufficient in terms of water supply
• Co. is free to take up any position
• Later arriving units may drop off crew
• A lg hoseline or masterstream may be used immediately

Question 5

Disadvantages of forward lay

Answer 5

• Slight delay when pumper stops to hook up to hydrant
• Temp loss of firefighter to charge supply line
• Supply lines being laid may hinder access of ladder company

Question 6

Advantage of Large Diameter Hose (LDH)

Answer 6

• Increase in flow area
• Reduction in friction loss
• Increased productivity

Question 7

Factors in ascertaining what rescue operations are needed:

Answer 7

• Extent of fire
• Building size
• Building age
• Occupancy
• Apparant population

Question 8

Direct attack

Answer 8

An attack in which a solid or straight hose stream is used to deliver water directly onto the base of the fire

Question 9

Indirect attack

Answer 9

An attack in which a solid, straight, or narrow fog stream is used to direct water at the ceiling to cool superheated gases in the upper levels of the room

Disadvantage: Water-to-steam expansion ratio is capable of causing serious burns to firefighter and victims

Question 10

Most common smooth bore tips sizes for master steam appliances

Answer 10

• 1 3/8 (500 gpm)
• 1 1/2 (600 gpm)
• 1 3/4 (800 gpm)
• 2” (1000)

Note: These should be operated at 80 psi

Question 11

Recommended pressure when supplying sprinkler systems

Answer 11

150 psi

Question 12

Conduction

Answer 12

Travel of heat through a solid body

Question 13

Convection

Answer 13

Travel of heat through the motion of heated matter; smoke, hot air, heated gases

Note: Convection is the main reason for ventilation requirements

Question 14

Radiation

Answer 14

Travel of heat through space, no material substance required

• Unaffected by wind
• Unless blocked, radiated evenly in all directions
• Greatest cause of exposure fires
• Cannot ignore windward side of building

Note: Proper ventilation does little to help against radiant heat. Radiant heat must be counteracted with adequate amounts of water at the seat of the fire

The only way to protect exposures from radiant heat is to cool them with water

Question 15

4 types of spray nozzles

Answer 15

1. Basic spray
2. Constant gallonage
3. Constant pressure (Automatic)
4. Select gallonage

Question 16

Backup lines for:

Two 1 3/4” lines

One 2 1/2” line

Answer 16

Two 1 3/4” lines = One 2 1/2” line

One 2 1/2 line = One 2 1/2” line

Note: If 2 1/2” hoselines are used for initial attack, backup lines should be 2 1/2” lines with larger tips. If the lines have spray nozzles, backups should be equipped with smooth bore tips

Question 17

Pump operators should maintain a residual pressure of __ psi?

Answer 17

20 psi

Note: The residual pressure should not be allowed to drop below 10 psi, except under extreme circumstances

Question 18

Classes of standpipe systems - I, II, II

Answer 18

Class I - Provide 2 1/2” hose connections for full scale firefighting. Intended for use by fire dept, not building occupants

Class II - Provide 1 1/2” connections for first-aid firefighting. Intended for use by building occupants

Class III - Combo of Class I and Class II

Note: Class I and III systems must provide 100 psi residual pressure at top-most hose connections w/ a minimum flow of 250 gpm

Class II systems must deliver 100 gmp for 30 minutes. It also must maintain a residual pressure of 65 psi at most remote connection while flowing 100 gpm

Question 19

The attack hose is designed for pressures up to __

Answer 19

275 psi

Question 20

A 2 1/2” supply line should not be used to deliver much more than __

Answer 20

350 gpm

Question 21

A pumper at hydrant should initially begin pumping to the unit at the fire at __

Answer 21

100 psi

Question 22

Basement fires

Answer 22

• An aggressive interior attack should be made from the unburned side
• In most cases the fire, heat, and smoke are venting out in the proper directions (the burned side)
• If fire is burning up stairways, an attack line must be positioned to protect stairway
• Ventilation is a key elemen in controlling the fire
• A fire in the basement is much more dangerous to occupants than a fire on an upper floor

Question 23

NFPA 1901 requires a minimum of __ ft of 1 1/2”, 1 3/4”, or 2” hose to be carried on a pumper apparatus

Answer 23

400 ft

Question 24

FDC’s

Answer 24

• Most are provided with one 2 1/2” inlet for each 250 gpm of design flow rate
• It is preferable to use 4” or larger piping for connecting the FDC to the system mains
• For siamese, 1st line should be connected to the left intake