Driver Operator Study State Questions

Driver Operator Study State Questions 8.35 pounds Ans- How much does 1 gallon of water weigh? 231 cubic inches Ans- How many cubic inches does 1 gallon of water contain? 62.5 pounds Ans- How many pounds does 1 cubic foot of water weigh? 7.481 gallons Ans- How many gallons of water does 1 cubic foot contain? 1,728 cubic inches Ans- How many cubic inches are there in 1 cubic foot? .434 psi Ans- A 1 foot high column of water exerts how much psi at it's base? 2.304 feet Ans- How many feet will 1 psi of pressure raise a column of water? 13.55 inches Ans- 1 inch of mercury is equal to how many inches of water? HG Ans- What is the symbol for inches of mercury? 14.7 feet Ans- How many feet is dependable lift? 33.87 feet Ans- How many feet is theoretical lift? By performing routine maintenance checks on a regular basis. Ans- How can most apparatus or equipment failures be prevented? No Ans- Is exercising the volume-series control lever part of the daily apparatus inspection? 1 inch Ans- Apparatus with water tanks of 1000 gallons or less must have a tank fill line of at least how many inches? 2 inches Ans- Apparatus with water tanks more than 1000 gallons must have a tank fill line of how many inches? NFPA 1901 Ans- What NFPA is the standard for automotive fire apparatus? NFPA 11C NFPA 1901 Ans- Industrial foam pumpers are built according to what NFPA numbers? 50-75 feet Ans- At what height do elevating water devices typically range? The source pumper Ans- During relay pumping, which pumper should be the largest capacity pumper? The scene pumper Ans- Relay pumping evolutions should be shut down at what pumper first? 10 feet of lift 20 feet of hard suction Ans- Pumper capacities are set at draft with how many feet of lift? And through how many feet of hard suction? 150 psi Ans- Pumpers should flow how many psi at 100% capacity? 200 psi Ans- Pumpers should flow how many psi at 70% capacity? 250 psi Ans- Pumpers should flow how many psi at 50% capacity? Back pressure Ans- Head pressure equals? Acceptance test Ans- What is the test performed at the factory or after delivery to assure the purchaser that the apparatus meets BID specifications? True Ans- Pressure supplied to a hose should not exceed that at which it is annually tested. True or False? 300 gpm Ans- Master streams have flows of over how many gpm? True Ans- On a standpipe system, firefighters should disconnect house lines and use their own hoses. True or False? 200 psi Ans- The maximum allowable pressure for a relay is how many psi? 0 psi Ans- What is the friction loss for appliances with flows of less than 350 psi? 10 psi Ans- What is the friction loss for appliances with flows of more than 350 psi? True Ans- There is no "positive mechanical blockage" between the intake and discharge sides of a centrifugal pump. True or False? An air leak or Air in the pump Ans- What is the most common reason for loss of prime? 1,500 gallons Ans- What is the maximum tank capacity, in gallons, for a single rear axle fire unit? Incoming pressure Ans- A centrifugal pump takes advantage of what type of pressure? L x W x H= V (volume) Ans- What is the Formula for finding the volume of a square or rectangle? Diameter squared x .7854 x H= V (volume) Ans- What is the Formula for finding the volume of a cylinder? 1.5 x D squared x NP= NR (nozzle reaction) Ans- What is the Formula for finding nozzle reaction? 1.8 x D squared x EP= INR (initial nozzle reaction) Ans- What is the Formula for finding initial nozzle reaction? 1/2 GPM= NR (nozzle reaction) Ans- What is the Rule of Thumb formula for finding nozzle reaction? L x W / 100= sprinkler heads needed Ans- What is the Formula for determining the number of sprinkler heads needed? 1/2 P + 15= Q (gpm) Multiply the answer x the number of heads x the minutes flowing to get the total flow. Ans- What is the Formula for finding the gpm (Q) of 1 sprinkler head? (Q-15) x 2= P (discharge pressure) Ans- What is the Formula for finding the discharge pressure at each sprinkler head? 29.7 x D squared x square root of the nozzle pressure= gpm Ans- What is the Formula for finding the GPM for a restricted opening such as a smooth bore nozzle? 29.7 x D squared x square root of the nozzle pressure x .9= gpm Ans- What is the Formula for finding the the GPM for an unrestricted opening? You can have 3 more like flows Ans- What is the hydrant capabilty with a difference between the static and residual pressure from a hydrant of 0-10%? You can have 2 more like flows Ans- What is the hydrant capabilty with a difference between the static and residual pressure from a hydrant of 11-15%? You can have 1 more like flow Ans- What is the hydrant capabilty with a difference between the static and residual pressure from a hydrant of 16-25%? You can use less than 1 like flow Ans- What is the hydrant capabilty with a difference between the static and residual pressure from a hydrant of more than 25%? 8.94 Ans- What is the square root of 80? 7.07 Ans- What is the square root of 50? Found under MINUS 10 METHOD page 36 of the FIRE SERVICE HYDRAULICS manual. Ans- Know the "rule of thumb" friction loss calculations. 20 psi plus friction loss Ans- When pumping in a relay, the supplying pumper should supply how much psi of residual pressure to the intake of the next engine? 250 psi Ans- In no case should engine pressure exceed how many psi? 10 psi Ans- How much psi of friction loss needs to be added for every additional 100 feet of hose used to supply an FDC? 600 psi Ans- At what psi are discharge gauges calibrated? Pressure remaining on a system when water is flowing. Ans- What is residual pressure? Pressure on a system when water is not flowing. Ans- What is static pressure? The forward velocity pressure at a discharge when water is flowing. Ans- What is flow pressure? From the nozzle through the pump to the hydrant and water main. Ans- If a nozzle is shut down quickly, where does the water hammer go? Natural Mechanical Chemical Ans- What are the 3 ways water pressure is created? Mechanical Ans- What type of pressure is created by a pump? By adjusting engine rpm's based on changes in incoming pressure. Ans- How does a pressure governor work? Open the auxilary engine cooler. Ans- If an engine is overh