WATER DISTRIBUTION STUDY GUIDE
QUESTIONS WITH CORRECT
ANSWERS
The proper first aid treatment for poisonous spider bite is to - Answer-pack the wound in
ice and seek medical attention
A black stain on plumbing fixtures may be caused by ____ in the water. - Answer-
manganese
An operator heard a pinging sound coming from a pump. What is a possible cause? -
Answer-cavitation
An artesian system means that the water - Answer-is under natural pressure due to the
aquifer being enclosed by impervious strata.
Static suction head plus friction suction head plus static discharge head plus friction
discharge head makes up the _______ of a pump. - Answer-Total Dynamic Head
Hydrant seal leakage should be checked - Answer-with listening devices
Indications of corrosive water include high concentrations of - Answer-carbon dioxide
The drain hole in a hydrant is designed to - Answer-remove water from hydrant to
prevent freezing
Which one of the following meters is used if the water demand varies considerably? -
Answer-compound
Groundwater may best be described as water taken from - Answer-wells and springs
Water leaking to the surface after operating an old valve probably is caused by -
Answer-dried out packing
A centrifugal type pump should never be run empty except momentarily because -
Answer-the parts lubricated by water would be damaged
, In a distribution system, which type of valve is usually used for isolation of a section? -
Answer-Gate valve
Many mechanical devices, such as dishwashers, washing machines and flush-meters,
do not operate satisfactorily at water pressure below which approximate level? -
Answer-30 PSI
Shut off valves should be located in a water main of a residential district at least every
____ ft. - Answer-800
Larger size gate valves in a distribution system normally have a bypass valve. The
purpose of this bypass is to - Answer-equalize pressure on both sides an a larger gate
The minimum number of bacteriological samples that should be collected from a
distribution system and examined each month is - Answer-based on the population or
number of services
Gate valves are normally used in a distribution system because they - Answer-have less
friction loss
The coupon test can be used as - Answer-an indication of the corrosion/scaling rate
Red water is experienced in one water main while no problem exists in nearby mains in
the system. Laboratory tests show that the water is not corrosive. You should check -
Answer-for bacteria
The effect of partially closing the discharge valve on a three phase, induction motor-
driven, centrifugal pump would be to - Answer-cause the motor to draw less amperage
Polyphosphates are used to - Answer-keep iron and manganese in solution
Which of the following types of pumps works on the principle of a decrease in the
overall specific weight of a confined column of a gas-water mixture - Answer-Air lift
If you come upon a co-worker who is not breathing, you should immediately - Answer-
Start artificial respiration
A connection from the municipal water supply directly to the packing gland of a
centrifugal wastewater pump - Answer-is a hazard to the safety of the potable water
supply
A waterborne disease that can be transferred to humans if proper disinfection is not
provided is - Answer-Typhoid
Rising stem valves are most often used - Answer-in a pumping station
QUESTIONS WITH CORRECT
ANSWERS
The proper first aid treatment for poisonous spider bite is to - Answer-pack the wound in
ice and seek medical attention
A black stain on plumbing fixtures may be caused by ____ in the water. - Answer-
manganese
An operator heard a pinging sound coming from a pump. What is a possible cause? -
Answer-cavitation
An artesian system means that the water - Answer-is under natural pressure due to the
aquifer being enclosed by impervious strata.
Static suction head plus friction suction head plus static discharge head plus friction
discharge head makes up the _______ of a pump. - Answer-Total Dynamic Head
Hydrant seal leakage should be checked - Answer-with listening devices
Indications of corrosive water include high concentrations of - Answer-carbon dioxide
The drain hole in a hydrant is designed to - Answer-remove water from hydrant to
prevent freezing
Which one of the following meters is used if the water demand varies considerably? -
Answer-compound
Groundwater may best be described as water taken from - Answer-wells and springs
Water leaking to the surface after operating an old valve probably is caused by -
Answer-dried out packing
A centrifugal type pump should never be run empty except momentarily because -
Answer-the parts lubricated by water would be damaged
, In a distribution system, which type of valve is usually used for isolation of a section? -
Answer-Gate valve
Many mechanical devices, such as dishwashers, washing machines and flush-meters,
do not operate satisfactorily at water pressure below which approximate level? -
Answer-30 PSI
Shut off valves should be located in a water main of a residential district at least every
____ ft. - Answer-800
Larger size gate valves in a distribution system normally have a bypass valve. The
purpose of this bypass is to - Answer-equalize pressure on both sides an a larger gate
The minimum number of bacteriological samples that should be collected from a
distribution system and examined each month is - Answer-based on the population or
number of services
Gate valves are normally used in a distribution system because they - Answer-have less
friction loss
The coupon test can be used as - Answer-an indication of the corrosion/scaling rate
Red water is experienced in one water main while no problem exists in nearby mains in
the system. Laboratory tests show that the water is not corrosive. You should check -
Answer-for bacteria
The effect of partially closing the discharge valve on a three phase, induction motor-
driven, centrifugal pump would be to - Answer-cause the motor to draw less amperage
Polyphosphates are used to - Answer-keep iron and manganese in solution
Which of the following types of pumps works on the principle of a decrease in the
overall specific weight of a confined column of a gas-water mixture - Answer-Air lift
If you come upon a co-worker who is not breathing, you should immediately - Answer-
Start artificial respiration
A connection from the municipal water supply directly to the packing gland of a
centrifugal wastewater pump - Answer-is a hazard to the safety of the potable water
supply
A waterborne disease that can be transferred to humans if proper disinfection is not
provided is - Answer-Typhoid
Rising stem valves are most often used - Answer-in a pumping station
