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AWWOA Practice Exams > Water Distribution 1.0 > Flashcards

Water Distribution 1.0 Flashcards

1
Q

What are monochloramine and dichloramine?
a) Colloids
b) Coliforms
c) Chloramines
d) Free chlorine

A

c) Chloramines

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2
Q

The colorimetric method for free chlorine uses DPD powder. What does DPD stand for?
a) Diethyl peptide
b) Disinfection Product
c) N,N-diethyl-p-phenylenediamine
d) Diethyl-p-phenylenediamine

A

c) N,N-diethyl-p-phenylenediamine

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3
Q

What is the accepted method used to measure turbidity?
a) Jar Test
b) Vacuum filtration
c) Secchi disc
d) Nephelometric

A

d) Nephelometric

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4
Q

The water level in a reservoir prior to the start of the pump:
a) Static level
b) Dynamic level
c) Water well level
d) Water table

A

a) Static level

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5
Q

For a first-flush sample the water should stay stagnant for a minimum of:
a) 1 hour
b) 2 hours
c) 4 hours
d) 6 hours

A

d) 6 hours

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6
Q

Surge tanks in the water system are used to prevent:
a) Hydraulic gradient loss
b) Pipeline gradient loss
c) Static oscillation
d) Water hammer

A

d) Water hammer

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7
Q

Consumers usually notice turbidity in excess of how many NTU?
a) 2
b) 3
c) 5
d) 10

A

c) 5

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8
Q

Asbestos cement pipe contains which of the following material?
a) Silica sand
b) Fiberglass
c) Calcium Oxide
d) Sulphide

A

a) Silica sand

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9
Q

What is the recommended chlorine dosage for disinfection when using the slug method?
a) 50 mg/L
b) 100 mg/L
c) 300 mg/L
d) 500 mg/L

A

c) 300 mg/L

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10
Q

The aesthetic objective for iron suggests the concentration does not exceed:
a) 0.60 mg/L
b) 0.50 mg/L
c) 0.40 mg/L
d) 0.30 mg/L

A

d) 0.30 mg/L

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11
Q

A good time to inspect a storage reservoir is:
a) During the night
b) During the afternoon
c) When the water level is high
d) When the water level is low

A

d) When the water level is low

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12
Q

What type of meter determines the total flow by multiplying a flow factor?
a) Propeller
b) Magnetic
c) Proportional
d) Piston

A

c) Proportional

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13
Q

As the total head in a water system increases, the volume that a centrifugal pump delivers is reduced:
a) Proportionally
b) Disproportionally
c) Directly
d) Indirectly

A

a) Proportionally

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14
Q

Which of the service line materials will cause corrosion when connect to brass?
a) Polyvinyl chloride
b) Copper
c) Galvanized iron
d) Plastic

A

c) Galvanized iron

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15
Q

Which type of distribution system has smaller mains that generally terminate at dead ends?
a) Arterial-loop system
b) Grid system
c) Tree system
d) Dendritic system

A

c) Tree system

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16
Q

Which type of distribution system enhances the flow capacity of the system and eliminates the occurrences of dead-end pipes?
a) Dendritic system
b) Tree system
c) Grid system
d) Arterial-loop system

A

c) Grid system

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17
Q

Which of the following best describes drawdown?
a) Change in water elevation from the normal level to the pumping level.
b) Water level in a well after the pump has operated for a period of time.
c) Distance from the cone of depression that affects normal water level.
d) Distance from the ground to the pumping level.

A

a) Change in water elevation from the normal level to the pumping level.

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18
Q

The pressure during fire flow conditions should not drop below:
a) 5 psi
b) 10 psi
c) 15 psi
d) 20 psi

A

d) 20 psi

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19
Q

The capacity and size of a water distribution system is based largely on:
a) Peak hour demand
b) Fire demand
c) Industrial demand
d) Agricultural demand

A

b) Fire demand

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20
Q

Current meters are also known as:
a) Orifice meters
b) Nutating disc meters
c) Venturi meters
d) Velocity meters

A

d) Velocity meters

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21
Q

Water behind a dam and above a water reservoir has energy by virtue of its elevation. This difference in elevation is known as elevation head or potential energy.
a) Potential energy
b) Kinetic head
c) Pressure head
d) Velocity head

A

a) Potential energy

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22
Q

What device is used to prevent contamination of potable water systems:
a) Valves
b) Boilers
c) Air-gap
d) Hydrants

A

c) Air-gap

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23
Q

Turbidity in water is caused by:
a) Colour
b) Dissolved materials
c) Finely suspended materials
d) Ammonia

A

c) Finely suspended materials

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24
Q

An example of a large flow water meter is:
a) Positive displacement type
b) Velocity type
c) Piston type
d) Rotating disc type

A

b) Velocity type

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25
Q

Hydraulics is the study of:
a) Fluids in motion
b) Fluids at rest
c) Fluids in motion and at rest
d) Pressure of fluids in motion and at rest

A

c) Fluids in motion and at rest

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26
Q

In general, what is the practical lift of pumps?
a) 0 to 5 ft
b) 5 to 10 ft
c) 10 to 15 ft
d) 15 to 25 ft

A

d) 15 to 25 ft

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27
Q

If a magnetic starter fails to close the circuit, the cause may be:
a) Defective coil
b) Dirty contacts
c) Defective control circuit relay
d) Loss of magnetic field

A

d) Loss of magnetic field

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28
Q

What are three types of electric motor starters?
a) Across-the-line, solid state, wye delta
b) Solid state, part winding, gear reduction
c) Part winding, auto transformer, straight drive
d) Across-the-line-, wye delta, gear reduction

A

a) Across-the-line, solid state, wye delta

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29
Q

This refers to the speed at which water is moving and is measure in m/sec or ft/sec:
a) Velocity
b) Head
c) Pressure
d) Friction

A

a) Velocity

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30
Q

What type of pressure exits in water even when it is at rest?
a) Dynamic
b) Static
c) Positive
d) Negative

A

b) Static

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31
Q

This is the industry electronic standard range:
a) 0-100 mA AC
b) 0-100 mA DC
c) 4-20 mA AC
d) 4-20 mA DC

A

d) 4-20 mA DC

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32
Q

What is the main purpose of the meter yoke?
a) Provide additional elevation head
b) Provide cushion against stress and strain
c) Provide proper support and alignment
d) Provide meter calibration

A

c) Provide proper support and alignment

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33
Q

Large meters are often tested at what percentage of their operating range?
a) 25-30%
b) 20-25%
c) 10-20%
d) 5-10%

A

d) 5-10%

34
Q

When installing a water meter, it should be placed in this position for optimal performance:
a) On a horizontal plane
b) On a vertical plane
c) Diagonal to water line
d) Diagonal to water line valve

A

a) On a horizontal plane

35
Q

Stray current corrosion is caused by:
a) Alternating currents
b) Direct currents
c) Corrosive soils
d) Acidic soils

A

b) Direct currents

36
Q

Sacrificial anodes are also called:
a) Corrosion anodes
b) Decaying anodes
c) Synthetic anodes
d) Galvanic anodes

A

d) Galvanic anodes

37
Q

What is the cause of death with hydrogen sulphide gas?
a) Causes asphyxiation.
b) Paralyzes the respiratory system.
c) Paralyzes the heart.
d) Paralyzes the nervous system.

A

b) Paralyzes the respiratory system.

38
Q

A step-by-step response to, and recovery from, incidents related to emergencies:
a) Preventative emergency plan
b) Emergency response plan
a) Vulnerability assessment
d) Emergency maintenance plan

A

b) Emergency response plan

39
Q

A method to identify and prioritize vulnerabilities in a system:
a) Preventative emergency plan
b) Vulnerability assessment
c) Emergency maintenance plan
d) Preventative emergency plan

A

b) Vulnerability assessment

40
Q

The most expensive part of pipe installation is the:
a) Valve fittings
b) Excavation
c) Pipe materials
d) Pipe fittings

A

b) Excavation

41
Q

When a metal is galvanized, what is it is coated with?
a) Lead
b) Zinc
c) Brass
d) Aluminum

A

b) Zinc

42
Q

How is pipe strength expressed:
a) Pressure potential
b) Hydrostatic potential
c) Galvanic strength
d) Tensile and flexural strength

A

d) Tensile and flexural strength

43
Q

The resistance of a material to longitudinal pulling force before it breaks is called:
a) Tensile
b) Sheer
c) Ductile
d) Durability

A

a) Tensile

44
Q

Which type of service pipe material is no longer acceptable for drinking water?
a) Lead
b) Zinc
c) Brass
d) Aluminum

A

a) Lead

45
Q

What is the maximum pressure for fire hydrant leaks?
a) 50 psi
b) 100 psi
c) 150 psi
d) 200 psi

A

c) 150 psi

46
Q

The lowest pressure point in the pump is the:
a) Centre of the pipe
b) Centre of the impeller
c) Center of the pump
d) Center of the discharge pipe

A

b) Centre of the impeller

47
Q

What is the first step in atmospheric testing before entering a confined space?
a) Test for oxygen enrichment
b) Test for oxygen deficiency
c) Test for hazardous gases and conditions
d) Calibrate the gas detection device.

A

d) Calibrate the gas detection device.

48
Q

What safety precaution should be taken when mixing an acid with water?
a) Add the acid quickly to water
b) Add the acid slowly to water
c) Add the water quickly to acid
d) Add the water slowly to acid

A

b) Add the acid slowly to water

49
Q

What is a confined space?
a) A space for confining hazardous chemicals
b) A space that has unlimited means for entry or exit and is not designed for continuous occupancy.
c) A space that has limited means for entry or exit and is designed for continuous occupancy.
d) A space that has limited means for entry or exit and is not designed for continuous occupancy.

A

d) A space that has limited means for entry or exit and is not designed for continuous occupancy.

50
Q

To properly flush a distribution system, the velocity in the line should be at least?
a) 1.5 feet/sec
b) 2.5 feet/sec
c) 3.5 feet/sec
d) 4.5 feet/sec

A

b) 2.5 feet/sec

51
Q

The purpose of the mechanical seal is to ___________ leakage.
a) Stop
b) Reduce
c) Control
d) Divert

A

c) Control

52
Q

When should a mechanical seal be replaced?
a) When leakage occurs from the volute
b) When leakage occurs from the impeller
c) When leakage occurs from the stuffing box
d) When leakage occurs from the volute

A

c) When leakage occurs from the stuffing box

53
Q

Which valve requires only a ¼ turn from open to close?
a) Shear gate
b) Globe
c) Butterfly
d) Gate

A

c) Butterfly

54
Q

What is the primary source of lead in drinking water?
a) Corrosion of plumbing systems
b) Groundwater
c) Lakes
d) Rivers near lead mines

A

a) Corrosion of plumbing systems

55
Q

How many degrees should two packing rings be staggered in the stuffing box?
a) 180 to 360 degrees
b) 90 to 180 degrees
c) 45 to 90 degrees
d) 15 to 45 degrees

A

b) 90 to 180 degrees

56
Q

Your public works current annual budget for salaries is $350,000. A 3% raise will be given to all employees next year. Calculate the budget for that year.
a) $353, 500
b) $355, 500
c) $358, 500
d) $360, 500

A

d) $360, 500

57
Q

As a general rule, water pipes should have a horizontal distance of ______ from sewer pipes:
a) 1 metre
b) 3 metres
c) 5 metres
d) 10 metres

A

b) 3 metres

58
Q

Thrust from a water surge almost always acts _________ to the inside surface that it pushes against:
a) Perpendicular
b) Vertically
c) Horizontally
d) In reverse

A

a) Perpendicular

59
Q

Which of the following is a measure of a materials opposition to flow of current?
a) Volts
b) Amperes
c) Watts
d) Ohms

A

d) Ohms

60
Q

Which of the following can be a disadvantage of using steel pipe material:
a) It has the potential for internal and external corrosion.
b) It has the potential for internal corrosion.
c) It is inexpensive.
d) It is easy to install due to its light weight.

A

a) It has the potential for internal and external corrosion.

61
Q

Which of the following is true?
a) Class D bedding uses a concrete cradle or arch to support the pipe.
b) In Class B bedding, the pipe is supported by sand and/or silt.
c) In Class C bedding, the pipe is placed directly on the bottom
d) In Class A bedding, little care is taken to shape the pipe foundation

A

c) In Class C bedding, the pipe is placed directly on the bottom of the bed

62
Q

What pressure is used for pressure testing distribution system mains
a) Pipe diameter (in cm) multiplied by 22.2.
b) 660 kPa (100 psi) or 2 times the operating pressure whichever is greater.
c) 1,000 kPa (150 psi) or 1.5 times operating pressure, whichever is greater.
d) 660 kPa (100 psi) or 2 times the operating pressure whichever is less.

A

c) 1,000 kPa (150 psi) or 1.5 times operating pressure, whichever is greater.

63
Q

New polyvinyl chloride has a C value of approximately:
a) 100
b) 110
c) 125
d) 150+

A

d) 150+

64
Q

What is the term for a framework installed to prevent caving of trench walls?
a) Shielding
b) Shoring
c) Sloping
d) Sheltering

A

b) Shoring

65
Q

Which impeller type is best used for pumping water with low volumes of solids?
a) Closed
b) Semi-closed
c) Open
d) Axial

A

a) Closed

66
Q

Which statement identifies the main functions of treated water reservoirs:
a) Water quality and wastewater services
b) Water quality and reliability
c) Wastewater collection
d) Water storage and capacity

A

b) Water quality and reliability

67
Q

What pipe quality provides for a long life and toughness?
a) Demolition resistant
b) Dexterity
c) Durability
d) Rigidity

A

c) Durability

68
Q

Backfill material for a pipe installation should contain enough ________ to allow for proper compaction:
a) Rip rap
b) Moisture
c) Gravel
d) Sand

A

b) Moisture

69
Q

Which type of hydrant has no main valve but each nozzle has a separate valve?
a) Dry- barrel
b) Wet - barrel
c) Breakaway
d) Flush

A

b) Wet - barrel

70
Q

Why is it essential to ventilate a vault before entry?
a) Eliminate moisture
b) Equalize pressure
c) Allow for insertion of swabs or pigs for main cleaning
d) Remove dangerous gases

A

d) Remove dangerous gases

71
Q

In areas with high water tables, how can hydrant freezing be prevented?
a) Install only self-draining hydrants.
b) Drain the assembly using the drain holes.
c) Install heat tape on all hydrants.
d) Ensure that they are not used in winter.

A

b) Drain the assembly using the drain holes.

72
Q

How often should hydrants be inspected?
a) At least twice yearly.
b) Only during repair or replacement.
c) Every 10 years.
d) Whenever a problem is suspected.

A

a) At least twice yearly.

73
Q

What is the optimal maximum water velocity through pipes under normal operating conditions?
a) 1 foot per second
b) 2 feet per second
c) 5 feet per second
d) 10 feet per second

A

c) 5 feet per second

74
Q

Identify the normal types of treated water storage facilities.
a) Underground reservoirs, elevated tanks, standpipes, concrete tanks.
b) Elevated tanks, secondary clarifiers, pipe galleries.
c) Standpipes, hydro pneumatic tanks, open lagoons.
d) Concrete tanks, low lift pumping stations, slow sand filters.

A

a) Underground reservoirs, elevated tanks, standpipes, concrete tanks.

75
Q

What class fire involves oil or grease?
a) Class A
b) Class B
c) Class C
d) Class D

A

b) Class B

76
Q

What is the area of a trench 25 metres long and 3.5 metres wide?
a) 78.5 m²
b) 80.5 m²
c) 87.5 m²
d) 97.5 m²

A

c) 87.5 m²

77
Q

If the water reservoir in the previous question is filled with 8 feet of water, how many litres of water is it holding?
a) 78 500 L
b) 80 500 L
c) 87 500 L
d) 97 500 L

A

c) 87 500 L

78
Q

A well water pump can deliver water at a rate of 600 litres per minute (Lpm). The groundwater storage reservoir is 15 metres long by 7 metres wide by 3 metres deep. How many hours will it take to fill the reservoir?
a) 4.75 hours
b) 5.85 hours
c) 7.85 hours
d) 8.75 hours

A

d) 8.75 hours

79
Q

If 1 psi is equivalent to 2.31 feet of water, what would be the gauge pressure at the bottom of the standpipe if the water level in the standpipe is 39 feet above the pressure gauge location? Express your answer in psi.
a) 14.8 psi
b) 16.8 psi
c) 18.8 psi
d) 20.8 psi

A

b) 16.8 psi

80
Q
A

AWWOA Practice Exams (5 decks)

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