WATER DISTRIBUTION GRADES 3 & 4 QUESTIONS AND
CORRECT ANSWERS | GRADED A+ | VERIFIED ANSWERS |
BRAND NEW VERSION!
Water Hammer Correct Answers The potentially damaging slam, bang,
or shudder that occurs in a pipe when a sudden change in water velocity
(usually as a result of someone too-rapidly starting a pump or operating
a valve) creates a great increase in water pressure.
Surge pressure Correct Answers A momentary increase of water
pressure in a pipeline due to a sudden change in water velocity or
direction of flow
Velocity Correct Answers the speed at which water moves, measured in
ft/sec or m/sec
Hydrostatic Pressure Correct Answers Pressure exerted by water at rest
Dynamic Pressure Correct Answers Pressure that exists in water as
moving energy
Static Pressure Correct Answers pressure that exists in water although
the water does not flow
Fire flow Correct Answers the rate of flow usually measured in gallons
per minute(gpm) or liters per minute(L/min) that can be delivered from a
water distribution system at a specified residual pressure for firefighting.
,when delivery is to fire depts. pumpers are specified residual pressure is
generally 20psi (140 Kpa)
What type of distribution system configuration has smaller mains that
generally terminate as deadends? Correct Answers D. Tree system
The pressure during fireflow conditions should not drop below? Correct
Answers B. 20 psi (138 KPa)
Maximum day demand Correct Answers the water during the 24 hours
of highest demand during the year
Peak hour demand Correct Answers the greatest volume of water in an
hour that must be supplied by a water system during any particular time
period, such as a year to meet customer demand
Per-capita water use Correct Answers average day demand divided by
number of residents connected to the water system.
average day demand Correct Answers the total system water use for 1
year divided by 365 days in a year.
tree system Correct Answers distribution system layout that centers
around a single arterial main, which decreases in size with length.
branches are taken off at right angles, with subbranches from each
branch
,what is the motor horsepower, if 200 horsepower is required to run a
pump with a motor efficacy of 88% and a pump efficacy of 74% Correct
Answers 310 mhp
what is plotted on the horizontal scale(x-axis) of a pump curve? Correct
Answers Capacity (flow rate)
Maximum contaminant level (MCL) Correct Answers the maximum
permissible level of a contaminant in water as specified in the
regulations of the Safe Drinking Water Act
running annual average Correct Answers
disinfection by-products (DBPs) Correct Answers new chemical
compounds that are formed by the reaction of disinfectants with organic
compounds in water. At high concentrations many DBPs are considered
a danger to human health
regulations that govern US water supply and treatment are developed by
the US environment protection agency under which act? Correct
Answers Safe drinking water act
a water system using conventional filtration treatment does not have to
use enhanced coagulation to achieve the total organic carbon (TOC)
percent removal if? Correct Answers the treated water quarterly running
average TOC is less than 2.0 mg/l
, pressure Correct Answers the force on a unit area of water
regarding fire flow, mains smaller that 6 in (150 mm) should be used
only Correct Answers to a complete a grid
groundwater system Correct Answers a water system using wells,
springs, or infiltration galleries as its source of supply
what is the formula for calculating chlorine demands Correct Answers
chlorine demand(mg/L) + chlorine residual(mg/L) = chlorine
dosage(mg/L)
what is the term for the amount of energy used by water in moving from
one location to another Correct Answers head loss
the (blank) is the outlet or high pressure, side of a pump Correct
Answers discharge side
what is the net positive suction head available given the following data?
will the pump cavitate if the net positive suction head required is 18.4 ft
1.11 ft/in = Hg
atmospheric pressure = 29.8in Hg
static suction lift = 15.1ft
friction head loss = 0.6ft
CORRECT ANSWERS | GRADED A+ | VERIFIED ANSWERS |
BRAND NEW VERSION!
Water Hammer Correct Answers The potentially damaging slam, bang,
or shudder that occurs in a pipe when a sudden change in water velocity
(usually as a result of someone too-rapidly starting a pump or operating
a valve) creates a great increase in water pressure.
Surge pressure Correct Answers A momentary increase of water
pressure in a pipeline due to a sudden change in water velocity or
direction of flow
Velocity Correct Answers the speed at which water moves, measured in
ft/sec or m/sec
Hydrostatic Pressure Correct Answers Pressure exerted by water at rest
Dynamic Pressure Correct Answers Pressure that exists in water as
moving energy
Static Pressure Correct Answers pressure that exists in water although
the water does not flow
Fire flow Correct Answers the rate of flow usually measured in gallons
per minute(gpm) or liters per minute(L/min) that can be delivered from a
water distribution system at a specified residual pressure for firefighting.
,when delivery is to fire depts. pumpers are specified residual pressure is
generally 20psi (140 Kpa)
What type of distribution system configuration has smaller mains that
generally terminate as deadends? Correct Answers D. Tree system
The pressure during fireflow conditions should not drop below? Correct
Answers B. 20 psi (138 KPa)
Maximum day demand Correct Answers the water during the 24 hours
of highest demand during the year
Peak hour demand Correct Answers the greatest volume of water in an
hour that must be supplied by a water system during any particular time
period, such as a year to meet customer demand
Per-capita water use Correct Answers average day demand divided by
number of residents connected to the water system.
average day demand Correct Answers the total system water use for 1
year divided by 365 days in a year.
tree system Correct Answers distribution system layout that centers
around a single arterial main, which decreases in size with length.
branches are taken off at right angles, with subbranches from each
branch
,what is the motor horsepower, if 200 horsepower is required to run a
pump with a motor efficacy of 88% and a pump efficacy of 74% Correct
Answers 310 mhp
what is plotted on the horizontal scale(x-axis) of a pump curve? Correct
Answers Capacity (flow rate)
Maximum contaminant level (MCL) Correct Answers the maximum
permissible level of a contaminant in water as specified in the
regulations of the Safe Drinking Water Act
running annual average Correct Answers
disinfection by-products (DBPs) Correct Answers new chemical
compounds that are formed by the reaction of disinfectants with organic
compounds in water. At high concentrations many DBPs are considered
a danger to human health
regulations that govern US water supply and treatment are developed by
the US environment protection agency under which act? Correct
Answers Safe drinking water act
a water system using conventional filtration treatment does not have to
use enhanced coagulation to achieve the total organic carbon (TOC)
percent removal if? Correct Answers the treated water quarterly running
average TOC is less than 2.0 mg/l
, pressure Correct Answers the force on a unit area of water
regarding fire flow, mains smaller that 6 in (150 mm) should be used
only Correct Answers to a complete a grid
groundwater system Correct Answers a water system using wells,
springs, or infiltration galleries as its source of supply
what is the formula for calculating chlorine demands Correct Answers
chlorine demand(mg/L) + chlorine residual(mg/L) = chlorine
dosage(mg/L)
what is the term for the amount of energy used by water in moving from
one location to another Correct Answers head loss
the (blank) is the outlet or high pressure, side of a pump Correct
Answers discharge side
what is the net positive suction head available given the following data?
will the pump cavitate if the net positive suction head required is 18.4 ft
1.11 ft/in = Hg
atmospheric pressure = 29.8in Hg
static suction lift = 15.1ft
friction head loss = 0.6ft
