Plumbing - Building Water Supply Part 8

The thrust developed testing six in. Pipeline at 100 psig is nearest to:

A. 1000 lb.

B. 2000 lb.

C. 3000 lb

D. 4000 lb.

The percentage of bearing always decreases in ditches that have tamped backfill or are contoured to fit the pipe: T or F?

If the bottom of a ditch is not properly prepared for the pipe, the pipe may have to act as a beam: T or F?

Water piping is buried to the same depth in all geographical areas: T or F?

Welded joints are sometimes used on cast iron main installations: T or F?

Individual water services are connected to mains by using tapping machines: T or F?

To prevent pipe joints from blowing out, you should use the rods and:

A. Hangers.

B. angle iron.

C. Friction clamps.

D. All of the above.

To prevent blowouts, water distribution systems are usually provided with concrete thrust blocks at:

A. 90* turns.

B. dead-ends.

C. Tees.

D. All of the above?

Potable water distribution systems are usually tested:

A. Hydrostatically.

B. using compressed air.

C. With bottled gases.

D. All of the above?

Cathodic protection is a/an … Process in which the metal to be protected is made the cathode in a galvanic cell?

An example o a sacrificial anode is:

A. Scrap iron.

B. manganese.

C. Magnesium.

D. Lectrolyte?

There are ... methods of producing cathodic protection?

Blocks of concrete poured to reinforce fittings or dead-ends are usually ... shaped?

... Is the degradation of a material by its environment?

Selection of backfill materials is important in minimizing exterior attack on buried pipelines: T or F?

If pipe joints must be defected slightly to follow ground contours, continuous rodding may be required: T or F?

The pipe, which delivers water from the main to the consumer, is called the water:

A. Branch.

B. provider.

C. Service.

D. Supply?

Water lines in a distribution system are usually disinfected by inserting some form of … Into the system?

Four in. Water mains are usually not tapped larger than:

A. 1/2".

B. 3/4".

C. 1".

D. 4"?

Corporation cocks generally range up to:

A. 1".

B. 2".

C. 3".

D. 4"?

Most small domestic water services require a swing joint in the event of movement due to:

A. Contraction.

B. expansion.

C. Settling.

D. All of the above?

The process of using several small taps for one line is called header tapping: T or F?

Large taps under pressure are usually made through a split tapping sleeve or a saddle: T or F?

Water services are generally classified as residential and municipal: T or F?

Small connections in cast iron mains are usually made by placing a corporation cock or stop in the main: T or F?

Residential water services generally have a shutoff valve immediately outside the structure being served: T or F?

Which answer is not one of the most commonly used meters:

A. Compound.

B. Positive displacement.

C. Turbine.

D. Yoke?

The best meter to use to register small amounts of flow is the:

A. Compound.

B. positive displacement.

C. Turbine.

D. Yoke?

Positive displacement meters operate by means of an oscillating piston in one type and … disc in another type?

The use of a magnetic drive adapter in a water meter eliminates the need for … ?

Outside meter installation are protected by a … ?

When rates of flow vary because of low and peak load periods, a meter is usually installed: T or F?

The primary reasons for selecting a manifold meter are lower weight and cost: T or F?

In meter with magnetic drive adapters, the gears are in direct contact with the water: T or F?

Larger meter yokes usually includes a by-pass: T or F?

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

.... Is caused by the abrupt alteration of flowing water?

The condition that develops when water at high velocity makes an abrupt change in direction is called ... ?

List four things you could do to reduce velocity and maintain flow?

It is a common practice to make an air chamber connector ... the supply pipe?

When lacking an insufficient quantity of air, an air chamber is termed … ?

The choice of piping material to be used is based on specific use, state, local or provincial code requirements, economics, and … ?

To reduce velocity while maintaining rate of flow, use reducers instead of bushings: T or F?

Rushing noises in water supply systems are the result of high pressure: T or F?

Pressure in a building water supply system can never be too high: T or F?

A hydrostatic test is one where the system is filled with water and then pressure equal to 1 1/2 times the normal operating pressure is pumped into the system: T or F?

Hot water is water to which heat:

A. Is removed.

B. energy has been added.

C. Can not be added.

D. Is relative?

Domestic hot water temperatures should be between:

A. 100*F and 120*F.

B. 105*F and 120*F.

C. 105*F and 140*F.

D. 140*F and 180*F?

When water is heated it(s):

A. Expands.

B. volume decreases.

C. Circulates.

D. Both a and c?

A temperature and pressure relief valve is:

A. Not required by most codes.

B. a dual type safety valve.

C. Designed for use on cold water piping only.

D. Installed on 100 gallon water heaters only?

When a non-return barrier is present on the cold water supply to a domestic hot water heating system it becomes a/an:

A. Open system.

B. dual purpose system.

C. Bypass type system.

D. Closed system?

As water is heated it immediately starts to ... ?

A thermal expansion tank features a ... air cushion ... To the minimum system pressure before recovery starts?

Pressure increases from thermal expansion occur occasionally: T or F?

The volume of hot water supply is governed by the recovery rate of a hot water heater: T or F?

Water is almost incompressible: T or F?

Specific heat is the amount of heat required to rise the temperature of 1 lb of substance:

A. 1*F.

B. 100*f

C. 20*F.

D. 75*F?

The definition of specific heat indicates you must know the ... of the water to be heated?

Water can be heated using the direct and ... Heating methods?

List four types of direct methods for heating domestic hot water?

Point of use heaters are small under-fixture ... type water heaters?

Heat is a form of ... Capable of producing work or motion?

Convection is always associated with solids: T or F?

A solar domestic hot water heating system is an example of direct heating method: T or F?

Water weights 8.33 lb per gallon: T or F?

There is no difference in the construction of residential and commercial/industrial hot water heaters: T or F?

multiple water heater flues are designed so that … or more flues pass through the tank?

A … Conveys cold water to the bottom of the storage tank of a hot water heater?

Gas-fired water heaters use:

A. Manufacture gas.

B. Propane gas.

C. Natural gas.

D. All of the above?

Gas-fired heaters have … Burners, forced draft burners or … Burners?

The heating elements in electric water heaters are available in a variety of standard … and wattages?

The most common lining applied to the interior of water heater tanks is made from:

A. Copper.

B. galvanizing.

C. Glass.

D. Stone.

Magnesium ... are used to protect the interior surfaces of a steel tank?

Galvanic action is corrosion caused by the flow of electrical current generated by dissimilar metals in contact with an electrolyte: T or F?

A dip tube can be installed in either the cold water inlet or the outlet (hot) side of a water heater: T or F?

The length of a dip tube is important as long as an anti-siphon hole is located near the top of the tube: T or F?

Domestic hot water supply system can be best classified by the type of service they perform, that is, one temperature and … temperature?

One temperature systems with storage are often called … systems?

Food service application are the most common examples of … temperature domestic hot water supply systems?

The minimum temperature needed for commercial dishwasher sanitizing rinse is:

A. 120*F.

B. 140*F.

C. 160*F.

D. 180*F?

List the names of the major parts of a domestic hot water supply system?

Forced … Requires the use of a circulating or booster pump?

Gravity circulation is more efficient than forced circulation: T or F?

Balancing valves can be used to equalize circulation throughout an entire domestic hot water supply system: T or F?

Check valves are used to prevent backflow and back pressure in a hot water supply system: T or F?

Heat always travels from a cooler substance to a warmer substance: T or F?

A 10" line tested at 100 psig has a total thrust of?

A 6" main operating at 90 psig develops a total thrust of?

What is the pressure at the base of a column of water 37 1/2' high?

How much pressure is required to raise water 90'?

If the pressure entering a building is 40 psi. How many feet will the water be raised in the building?

If a water service pipe supplies water to a building at 50 psi. The pressure at a riser tee on the eighth floor 80 feet above the water service, is approximately?

Calculate the volume of tank in gallons if D = 8'-0", H = 9'-0" ?

What is the weight of the water 3,393 gallon tank?

Determine the total force at the bottom of the tank with 28,298 lb of water?

A tee shall be placed on all meters 1 1/4" or larger for the purpose of … ?

A hot water supply system must maintain its temperature to the farthest fixture when it exceed a distance of ... ?

In a hot water supply system using a mixing valve you must route the circulated water to the ... Of the mixing valve and the ... Of the water heater?

Water pipe buried in NYC ... ?

Absorber?