QUIZ 2 Flashcards
The mixing valve assembly provides
heated water to the shower heads at
what temperature?
105°F
What percentage of the effluent from a
septic tank is composed of suspended
solids?
40% to 60%
The shower stand should be erected at
what distance from the mixing valve?
20 feet
The working load on a medium-duty
scaffold must not exceed how many
pounds per square foot of platform
surface?
50
The tap is normally in what location on
a water main?
Top
A hydrant should be located
approximately how many feet from a
building?
50
When a wall-mounted urinal is
installed, the distance between the
floor and the lip of the urinal should
not exceed
25 inches
What term describes the plumbing
receptacles into which wastes are put
before being discharged into the
sewer?
Fixtures
What type seal is commonly used
between a water closet bowl and a
water closet flange?
Preformed sealing ring
In a differential dry-pipe valve system, the air
must be maintained at least how many psi
greater than the trip pressure?
20
All automatic sprinkler systems have which of
the following characteristics in common?
- Water supply
- Piping network
- Sprinklers
- Each of the above
Each of the above
When performing a deluge valve dry trip-test in
a flammable area, you should use what test in
place of the electric test set?
Hot water or hot cloth
On what stroke of a gasoline engine is
air admitted to the engine?
Intake
The liquid in a diaphragm is made to
move by what kind of motion?
Reciprocating
By what means are mechanical seals
positioned on the shaft?
Stub or step sleeves
The function of what component of a
duct system is designed to deliver a
concentrated air stream into a room?
Register
Standard air-conditioning certification is divided into levels corresponding to the type of service a technician performs. How many types of technician certification are there?
Three
Cooling towers are classified as
natural draft, induced draft, or
Forced draft
What type of heat is absorbed or given
off when the physical state of a
substance is changing?
Latent
A total of how many Btu is required to
raise 5 pounds of water from 40°F to
165°F?
625
What type of condenser is used where
low-quality water and its disposal
make the use of circulating watercooled
types impractical?
Evaporative
Which of the following types of motors should
be used for a 5-horsepower, high-starting
torque requirement?
Capacitor-start, capacitor-run
When you want to preserve the freshness of
fruits and vegetables, you should use what
type of evaporator system?
Spray
Which of the following electrical components
is NOT part of a load circuit shown in a
hermetic system schematic wiring diagram?
Thermostat
You are installing warning signs for a
new water treatment plant.
Specifications for the signs are
covered in what division?
Specialties
The air-lift pump can deliver large
quantities of water at
relatively low pressures
Horizontal lines in an isometric
drawing are projected at what angles?
60° and 30°
When maintenance on a structure requires a
change to the record drawing, you should pass
this information to which of the following
departments?
Operations or maintenance control
As a supervisor, you should refer to what
documents as the chief source(s) of
information during a construction project?
- Construction drawings
- Project specifications
- Bill of materials
- Each of the above
Each of the above
To determine the point where service taps
should be connected, you should use which of
the following plans?
Plot
What value must increase when you
want to increase the boiling point of
water?
Pressure
Which of the following factors is a
disadvantage of the vertical fire-tube
boiler?
It has a limited capacity
What device allows the boiler operator
to determine the water level in the
boiler?
Gauge glass
At what time intervals should you
check the boiler settings for external
air leaks?
Every 24 hours
What precaution should you take
before making a hydrostatic test of a
boiler?
Gag the safety valves
Before a boiler is lighted off, which of
the following valves must be opened?
Feedwater stop and check
The pressure gauge on a boiler should be
tested at what intervals?
Semiannually
The continuous blowdown should be regulated
to maintain what ppm of TDS in a steaming
boiler?
3,000 to 4,000
When testing the functions of automatically or
manually controlled devices that interfere with
steam distribution, you should ensure that
which of the following main distribution valves
is/are closed?
Main steam
What portion of the venting system
extends above the highest fixture
branch?
The main soil and waste vent
A long-hubbed fitting used for
insertion into an existing line is called
a/an
sisson
A measurement was taken from the end
of a pipe to the center of a fitting.
What type of measurement was used?
End to center
What are the two types of duct
insulation?
Inside and outside
A valve is installed in the most
desirable position when the valve stem
is pointing in what direction?
Straight up
Which of the following items should
you use to air test a waterline, for
leaks?
A soapy water solution
How should in-stock diaphragms be
stored?
Underwater
The blower should be inspected for
internal corrosion or deterioration at
what intervals?
Annually
To remove organic growth from the watersides of the removable plates of a porous ceramic diffuser, you should use a 50-percent solution of what type of acid?
Nitric
What type of solution is used to detect
a chlorine leak?
Soapy
What type of waterborne disease
requires a carrier to infect people?
Schistosomiasis
What condition must be present for
groundwater to constitute a water
table?
Stabilized
There is a total of how many classifications of
wells?
5
For a normal field water supply, what type of
water source is the most accessible?
Surface
The pump and power unit used for testing a
well should be capable of continuous operation
for a minimum of how many hours?
24
You should use what type of solvent
to remove rust from a domestic
dishwasher?
Air-inhibited sulfamic acid
If a heating coil is restricted, the
condition will be shown by which of
the following readings?
30 psi or greater above normal
After filling a domestic dishwasher with hot water and an approved cleaning solution, you should then operate the machine at high temperature for what length of time?
30 minutes
Natural gas has which of the following
characteristics?
It is odorless and colorless
On what two factors does the
operation of the draft regulator
depend?
Balance and free action
Sensible heat plus latent heat equals
what type of heat?
Total
A thermodynamic trap is usually
constructed from what type of
material?
Stainless steel
In the two-pipe vapor distribution system, what component returns the condensate to the boiler and maintains the vacuum or subatmospheric pressure in the return system?
Vacuum pump
The hermetically sealed bellows of an
air vent contains a volatile liquid that
has a boiling point that is how much
lower than that of water?
10°F
What is the normal color of wastewater
containing dissolved oxygen?
Gray
Which of the following tests should be used as
a control test to help you decide whether to
increase or decrease the rate of sludge return?
MLSS
When decay proceeds under anaerobic
conditions, what is the ultimate result?
- Offensive odors
- Unsightly appearances
- Offensive conditions
- Each of the above
Each of the above
Rainwater is generally considered an electrolyte
because it contains
Dissolved atmospheric gases
What person is responsible for communicating
requirements to other companies and
departments?
The supervisor
Which of the following coatings is best suited
for use as a corrosion inhibitor on exposed
steel pipelines suspended along piers?
Coal tar
When testing e system with dry air or
nitrogen, you should use what percentage of
maximum working pressure for a minimum of
4 hours?
75%
A refrigerant dryer with a dew point at what
maximum temperature should be used to
remove moisture to meet air quality
requirements for instrument and control air?
30°F
High-pressure systems provide compressed air
within what pressure range?
400 psig to 6,000 psig
What type of joint is used to absorb expansion
and contraction in a duct system?
Fabric
What factors influence the performance
of a fan in a ventilation system?
- Static pressure and rpm of the fan
- Voltage and amperage of the fan motor
- Total airflow in the ventilation system
- Each of the above
Each of the above
The type of material used for duct lining and
covering must have what characteristic?
It must be noncombustible
Energy from the sun is received by the earth
in what form?
Radiation
What substance is added to water to make
it a useful collector fluid?
Ethylene glycol
What is the most commonly used substance
for collector covers?
Glass
