Plumbing - Building Water Supply Part 7

The chemical symbol for water is: A. 2HO. B. H2O. C O2H. D. HO2. ```

Water which is considered safe for use in home has a pH value of: A. 4.0 to 7.0.

B. 7.0 to 10.5.

C. 10.6 to 14.6.

D. None of the above.

The type of well that is considered to be the best all-round is the:
A. Bored.

B. drilled.

C. Driven.

D. Dug.

Suspended materials can be best removed by:

A. Sand filters.

B. coarse screens.

C. Sedimentation.

D. Chlorination.

The principle by which water softeners remove hardness particles from water is::

A. Distillation.

B. reverse osmosis.

C. Ion exchange.

D. Coagulation.

Water that is suitable for human consumption is termed ... water:

A. Distilled.

B. potable.

C. Mineral.

D. None of the above.

Living organisms can be removed by:

A. Sand filters.

B. flocculation.

C. Aeration.

D. Ionization,

Pure water usually exists only under laboratory conditions: T or F.

The most frequently used method used to kill harmful bacteria and viruses is by ultraviolet light: T or F?

The two most reliable systems for water distribution are:
A. Grid and branch.

B. grid and loop.

C. Tree and loop.

D. Tree and branch?

The shape of a trust block is:

A. Rectangle.

B. horizontal.

C. Semi fan.

D. Elliptical?

What is the purpose of a multiple distribution layout?

A. To control water supply.

B. to provide continuous service.

C. to remove odors.

D. To make potable water?

The depth of MYC water service pipe is buried at a depth of:

A. Depends on location.

B. 3'.

C. 4'.

D. 5'?

Underground water main piping should be protected against:

A. Contamination.

B. freezing.

C. Settling.

D. All a, b and c?

What type of water main distribution system is laid out in a checkerboard fashion?

A. Tree.

B. loop.

C. Trunk.

D. Grid?

Why are water mains "riffed":

A. To prevent blowouts.

B. to provide hanger attachments.

C. To clean stoppages.

D. To allow for expansion?

Potable water distribution system are usually tested:

A. With bottled gas.

B. using compressed air.

C. Hydrostatically.

D. All a, b and c?

What types of joints are used for ductile iron water piping?

A. Caulked or welded.

B. welded or groved.

C. Brazed or mechanical.

D. Mechanical or flanged?

An example of sacrificial anode is:

A. Srap iron.

B. magnesium.

C. Manganese.

D. Electrolyte?

The water meter used to register small amount of flow is:

A. Positive displacement.

B. turbine.

C. Compound.

D. Current?

Water meter generally register consumption in:

A. Gallons.

B. gallons per minute.

C. Cubic feet per hour.

D. Cubic feet?

A cubic foot of water contains .. gallons?

A. 8.5.

B. 7.5.

C. 7.0.

D. 10.5?

The minimum diameter water service pipe in NYC is:

A. 3/4".

B. 1".

C. 1 1/4".

D. 2"?

The hight of a meter dial above the floor shall be no more than:

A. 2 feet.

B. 30 inches.

C. 42 inches.

D. 3 feet?

Which is not a type of water meter:

A. Turbine.

B. positive displacement.

C. Yoke.

D. Compound?

A compound meter is two meters in one: T or F?

There two methods of producing cathodic protection: T or F?

Large meter yokes include a bypass: T or F?

Two types of positive displacement meters are oscillation piston and mutating disk: T or F?

The two main types of backflow are back pressure and : A. Air gap. B. Positive displacement. C. Pressure breaker. D. Back siphonage? ```

The safe drinking water act was established in: A. 1996. B. 1978. C. 1974. D. 1986. ```

What two approved divorces could be used in a building with a hazardous degree situation: A. Double check valve & RPZ. B. air gap & RPZ. C. Air gap & double check valve. D. Check valve & vacuum breaker. ```

A thermal expansion tank for a domestic water heater is installed: a. In front of the reload valve. B. on the outlet piping. C. On the supply side. D. Near the flue.

A backflow preventer prohibit the back flow of water into the potable water supply: T or F?

The environmental protection agency determines the degree of hazard: T or F ?

Water supply piping shall be tested:

A. At a minimum of 50 psi.

B. at one and one halftimes the normal pressure.

C. At not less than 150 psi.

D. At maximum of 150 psi?

A column of water one foot high exerts a pressure of :

A. 8.33 lbs.

B. 2.31 lbs.

C. 7.5 lbs.

D. .433 lbs?

A force acting on a specific surface area is called:

A. Pressure.

B. velocity.

C. Flow rate.

D. Friction.

The maximum pressure allowed at a fixture in NYC shall not exceed:

A. 100 psi.

B. 85 psi.

C, 75 psi.

D. 50 psi?

The formation of partial vacuums in a swiftly moving liquid which causes pitting of the piping and exterior walls is known as:

A. Water hammer.

B. cavitation.

C. Demineralization.

D. Electrolysis?

When a valve or faucet is suddenly closed against a flow of water, a condition called ... occurs:

A. Cavitation.

B. mutation.

C. Water hammer.

D. Back wash.

The most common type of pump installed is the :

A. Rotary.

B. piston.

C. Positive displacement .

D. Centrifugal.

To improve efficiency, the vanes of an impeller are curved backward from the direction of the rotation: T or F?

Theoretically, a pump can not lift water by suction more than:

A. 2.2 feet.

B. 33.9 feet.

C. The capacity of the motor.

D. .433 feet?

A positive displacement pump discharges a definite quantity of liquid for each operating cycle: T or F?

Pressure reducing valves are designed to fail:

A. In the open position.

B. in the closed position.

C. If the inlet pressure gets to low.

D. If the outlet pressure is to high?

The best way to reduce velocity while maintaining flow rate in a building water distribution system is by:

A. Installing globe valves.

B. increasing pipe size.

C. Using stainless steel pipe.

D. Adding more fittings?

Using a gravity tank to supply a building with water relies on the compressibility of air: T or F?

Circulating pumps use hydrostatic force to raise water: T or F?

A PRV is used to regulate pressure: T or F?

Formula for total thrust (force)?

Formula for head pressure?

Formulae for volume of tank?

Atmospheric pressure?

How much pressure of 1 psi raises water?

How much atmospheric pressure raises water ?

Water that is suitable for human consumption is termed … water?

The three principal sources of water supply for municipalities are lakes, rivers, and ... : A. Oceans. B. wells. C. Streams. D. Boathouse a and c?

Wells which serve individual water supply systems are classified as driven, dug, drilled and:

A. Tapped.

B. bored.

C. Machined.

D. Holed.

The chemical symbol for water is:

A. 2HO.

B. HO2.

C. O2H.

D. H2O?

Harmful impurities contained in water are particles in suspension and:

A. Minerals.

B. gases.

C. Pathogenic microorganisms.

D. All of the above?

Driven wells are considered to be best all-around type: T or fF?

All water can be treated so as to be harmful: T or F?

Wells are usually the last source of individual water supply: T or F?

Pure water contains no impurities whereas potable water does contain some impurities: T or F?

Pure water usually exist only under laboratory conditions: T or F?

The treatment used by a municipal water system that will meet the standards for public drinking water include:

A. Sedimentation and chlorination.

B. inoculation and isolation.

C. Filtration and fluoridation.

D. Both a and c?

Suspended materials can best be removed by:

A. Sand filters.

B. coarse screens.

C. Sedimentation.

D. Chlorination?

Bacteria and viruses can be destroyed by boiling, … And … ?

The material used as a coagulating agent to collect mud and suspended material in raw water is:

A. Chlorine.

B. fluorine.

C. Alum.

D. Aluminum?

To produce a good floc, water is agitated by slowly moving:

A. Paddles.

B. screens.

C . Baffles.

D. None of above?

Sand filters strain out turbildity , cysts. Algae and bacteria: T or F?

the most frequently used method to kill harmful bacteria and viruses is by ultraviolet light: T or F?

Detection of coliforms in the water in the water supply indicates sewage pollution has occurred and the waterbmay contain pathogenic organisms: T or F?

The peeve dire of adding hydrofluosilicic acid to water at a treatment plant to inhibit tooth decay is called flocculation: T or F?

Gases in water can be removed or neutralized by aeration: T or F?

pH is an abbreviation or symbol used to describe the … or alkalinity of water?

Hard water contains dissolved:
A. Calcium.

B. sodium.

C. Magnesium.

D. Both a and c.

Heavy materials such as logs are removed from municipal water supplies by:

A. Skimming.

B. settling.

C. Coarse screening.

D. Flocculation?

In order to expedite sedimentation … Is introduced into the raw water?

Water that is considered safe for use in the home has pH value of:

A. 4.0 to 7.0.

B. 7.0 to 10.5.

C. 10.6 to 14.6.

D. None of the above.

Hard water can result in clogged water supply lines: T or F?

Aeration or degasification removes hardness from water: T orF?

Individual water supplies, as a rule, require no sediment basin: T or F?

Regular laundry bleach is frequently used to add chlorine to an individual water supply system: T or F?

Carbon filters can be used to make treated water taste better: T or F?

The chemical used for disinfection is:

A. Carbon dioxide.

B. chlorine.

C. Fluoride.

D. Hydrogen sulfide?

The word not associated with municipal water distribution is:

A. Branch.

B. Grid.

C. Loop.

D. Tree?

The two systems that are most reliable are:

A. Tree and branch.

B. grid and loop.

C. Grid and branch.

D. Tree and loop?

What is the purpose of a multiple distribution layout?

A. To make water potable.

B. to control the water supply.

C. To provide continuous service.

D. To remove odors from the water.

... are usually installed at the intersection of trunk lines and mains?

Pumps used to deliver water pressure from the treatment plant directly to the distribution system are usually positive displacement type pumps: T or F?

The type of pump used to pump water to a high elevation to be delivered to a distribution system by gravity is a centrifugal type: T or F?

Privately owned distribution systems function in the same manner as municipally owned systems: T or F?

The direct system of distribution is more widely used than the indirect system: T or F?

Accept standards require finished potable water to be free of all organisms of a pathogenic nature: T or F?

State , local or provincial codes usually govern the size of piping that can be installed. The minimum size allowed for a residence is normally ... in diameter?

In a water distribution system, the largest diameter lines are generally:

A. Mains.

B. trunk.

C. Branch.

D. Main distribution?

The word not associated with good safety practices when working in a ditch is:

A. Sloped.

B. shored.

C. Speed.

D. Sheeted.

The formula to calculate thrust during a hydrostatic test is:

A. 2xpyxRxpsig.

B. .7854xDxDxpsig.

C. PyxDxDxpsig.

D. 2xpyxDxpsig?