C7 Low Voltage Systems - Test #1 Flashcards
If it is necessary to use artificial respiration on an injured person and the back pressure arm lift (Hoger-Nielson method) is chosen, in what position should the victim first be placed?
- Face down
- On the left side
- On the right side
- On his/her back
Face Down
__________ is the most frequent type of cable used for data.
- CAT 1
- CAT 3
- CAT 6
- CAT 4
Cat6
The total impedance of five 8-ohm speakers connected in parallel is
- 20 ohms
- 12 ohms
- 22 ohms
- 1.6 ohms
1.6 ohms
Cal/OSHA consists of ____ independent cooperating units, any one or all of which may directly or indirectly affect a contractor and his workers.
- 2
- 3
- 4
- 6
4
If 200 pieces of lumber are purchased at $12.00 each at a discount of 15 percent, what is the total cost?
- $2,400.00
- $2,160.00
- $2,040.00
- $216.00
$2040.00
Backbone cabling has how many pairs?
30
25
40
25
Flooded cable can be run how far into a building before it must be terminated?
10 feet
50 feet
20 feet
50
Elevators are required to have a landing provided at every _____floor.
second
third
fourth
fifth
third
A scaffold must be able to hold ____ times the load it is expected to carry.
2
3
4
8
4
A GFCI breaker or receptacle will open a circuit where there is a current leakage to ground fault of:
.06 A.
.006 A.
.6 A.
.2 A.
.006 A
How much should a light trade interior scaffold weigh on the average?
10 lbs. per sq. ft.
15 lbs. per sq. ft.
20 lbs. per sq. ft.
25 lbs. per sq. ft.
15
How far into a structure can a flooded cable be run before it must be terminated?
100
25
50
75
50
Burns are classified as:
first degree.
first or second degree.
first, second or third degree.
first, second, third or fourth degree.
first, second or third degree.
A 3 foot long steel drum has a diameter of 2 feet. What is the surface area of the drum?
12.48 sq. ft.
18.84 sq. ft.
23.45 sq. ft.
32.23 sq. ft.
18.84 sq. ft.
A job cost code is to be used:
for every transaction you post.
only for direct costs.
only for profit and loss accounts.
only on a fully automated system.
for every transaction you post.
H20 should never be used to put out an electrical fire.
True
False
True
The maximum stripping for coaxial cable when terminating coaxial cable F connectors is:
1/4 inch
1/3 inch
3/4 inch
1/2 inch
1/2 inch
A safe load for a 5/8″ manila rope, taking the safety factor into consideration, and that the top may be old, worn, damaged, etc. is:
300 lbs.
600 lbs.
900 lbs.
1000 lbs.
600 lbs.
Acceptable hearing protection must be worn by employees, if noise levels cannot be reduced to:
90 DBA.
80 DBA.
70 DBA.
50 DBA.
90 DBA.
All wooden scaffolds over _____ feet in height shall be designed by a licensed civil engineer currently registered in California and constructed and erected in accordance with such design.
36
42
50
60
60
How much is 3 percent of $725.62?
2.177
21.77
22.88
2.288
21.77
What does the abbreviation MHz stand for?
megahertz
microhertz
megahertz
A butterfly tool is used to terminate a 25-pair Amphenol plug.
True
False
True
According to Cal/OSHA, the ground within ____ of buildings under construction should be kept reasonably free of irregularities wherever it is practicable.
4 ft.
5 ft.
6 ft.
7 ft.
6 ft.
The maximum pulling tension for indoor fiber optic cables is 100 lbs.
True
False
True
A safe unobstructed means of access, such as a walkway, stairs or ladder shall be provided to all scaffold platforms that are:
18 inches.
5 feet.
6 feet.
7 feet 6 inches.
18 inches.
Dimensions on plan and elevation drawings are shown in:
feet.
inches.
both A and B.
neither A nor B.
both A and B.
How much money will settle a bill for $800.00 less 20 percent, 15 percent and 5 percent?
$412.78
$516.80
$580.16
$612.96
$516.80
Conduit is specified by nominal interior diameter.
True
False
True
If 1-1/2″ on a scale represents 1′ -0″, 1/8″ represents:
1″.
2″.
3″.
4″.
1”.
When installing telephone line, what color is used for the first pair?
blue
orange
green
black
blue
Backbone cabling has ___pairs.
30
45
100
25
25
How should you treat a serious burn victim at a jobsite?
Keep the victim warm but never touch the burn
Submerge the burned area in cold water
Put antiseptic to the burn and tightly wrap it
Put antiseptic to the burn and loosely wrap it
Keep the victim warm but never touch the burn
The maximum length of a run of singlemode fiber is____.
100m
200m
80km
40km
80km
A fiber optic cable is terminated with
STSC
568SC
termination screw
both A and B
both A and B
DCV stands for direct current voltage.
True
False
True
A short is tested with a/an
wattmeter
ammeter
ohmmeter
ohmmeter
Extension ladders should have adequate overlap between sections. A 36 ft. ladder should have a _____ ft. overlap.
2
3
4
5
4
A megohmmeter is used to test insulation resistance because it provides a:
higher potential than an ohmmeter.
multiple path for resistance.
convenient means of recording resistance.
wide range of resistance taps.
higher potential than an ohmmeter.
Electrical circuit lines are drawn curved rather than straight:
to allow the drafters to route the lines around the partitions.
to show that curved lines are not as difficult to draw on CAD systems as straight lines.
to show how conduit is installed.
not to confuse the circuit lines with the building lines.
not to confuse the circuit lines with the building lines.
The best tool to cut EMT is a pipe cutter.
True
False
True
90 degree bends are permitted in a single run of conduit.
True
False
True
A construction elevator, as well as stairways, are required for structures or buildings ____ feet or more below ground level or ____ feet above ground.
50 – 50
40 – 60
48 – 60
30 – 60
48-60
First aid materials are required at:
all construction locations.
construction locations with 1 worker.
construction locations with 10 or more workers.
none of the above.
all construction locations.
______ gage wire is used to ground telecommunications cable and equipment.
2 AWG
4 AWG
6 AWG
8 AWG
6 AWG
The ratio of true power to apparent power is power factor.
True
False
True
In an elevator, a capacity plate must be posted inside the car and ropes must be inspected and records kept. How often must the ropes be inspected?
Every 10 days
Every 15 days
Every 20 days
Every 30 days
Every 30 days
An employer who is guilty of willful misconduct can be given heavy penalties. Willful misconduct means:
the failure to observe reasonable enforced safety rules.
negligence in using protective safety devices.
a contractor who violates any order or recommendation made by the Division of Industrial Safety.
All of the above
All of the above
A 5/8″ manila rope will break under a load of:
3,000 lbs.
6,500 lbs.
2,300 lbs.
4,400 lbs.
4,400 lbs.
If 3″ = 1′, the drawing will be ____ of actual size.
1/4
1/8
1/12
1/16
1/4
Electrical information on plans is shown on:
floor plans for most residential construction.
floor plans for small commercial jobs.
electrical plans for large residential and most commercial construction.
All of the above
All of the above
An electrical fire should be fought with C02.
True
False
True
A convenient unit of measurement to compare the resistance and size of one conductor with another is the:
ohm.
mil-foot.
wattage.
voltage drop.
ohm
Every truck with a body capacity of one of those listed below used to haul dirt, concrete, rock, etc. shall be equipped with a warning device, such as a bell, that operates while the vehicle is backing:
2-1/2 cubic yards or more.
3-1/2 cubic yards or more.
4-1/2 cubic yards or more.
5-1/2 cubic yards or more.
2-1/2 cubic yards or more.
A legend or symbol list is shown on building construction working drawings to:
identify all symbols used to indicate materials and finishes specific to this drawing.
calculate the electric service size.
show the architect’s floor plan
indicate the installation and materials methods.
identify all symbols used to indicate materials and finishes specific to this drawing.
All tubular welded scaffolds over ____ feet in height must be designed by licensed engineers.
75
90
100
125
125
How many workers are allowed on a ladder jack scaffold at one time?
1
2
3
4
2
If 1″ = 1′, how many inches would 1/8″ be?
2 inches
3 inches
4 inches
1-1/2 inches
1-1/2 inches
A low-voltage switching system generally operates at 24 V ac.
True
False
True
The total impedance of five 8-ohm speakers connected in series is
1.8 ohms
22 ohms
1.6 ohms
40 ohms
40 ohms
If an employee is hurt on the job site, how many hours must he/she be kept in the hospital, other than for medical observation, if the incident is considered a serious accident?
4
8
16
24
24
Cal/OSHA standards that apply to the construction industry are contained in Title ____ of the California Administrative Code.
4
8
12
16
8
The difference between 568A cables and 568B cables are:
568A cables are shielded
568B cables have 4 wires only
The pairs of wires are arranged differently
The pairs of wires are arranged differently
According to Ohm’s Law, what voltage should be supplied if an appliance has a resistance of 24 ohms and draws 0.5 amps?
120 volts
30 volts
12 volts
24 volts
12 volts
The minimum cover for direct buried cables/conductors is ___, according to the Electrical Code.
32″
24″
12″
18″
24”
A ground is necessary for electrical equipment and power tools with exposed non-current carrying metal parts. A ground is not necessary for double insulated power tools.
True
False
True
Before beginning abatement work involving 100 square feet or more of surface area of asbestos-containing materials, the contractor must have proof of:
certification from CSLB.
registration with DOSH.
insurance for health coverage and workers’ compensation or a $500 trust account.
the training and certification of employees.
certification from CSLB.
What type of jack should be used on a CAT5 10MHZ cable installation?
RJ45
RJ11
RJ16
RJ45
An “Erickson coupling” used in the electrical field is:
a coupling used to join 2 lengths of EMT.
a coupling used on copper tubing.
a coupling used to join 2 lengths of flexible pipe.
a coupling used to join 2 lengths of rigid conduit.
a coupling used to join 2 lengths of rigid conduit.
How much is 3. percent of $824.74?
$22.74
$23.67
$24.74
$24.93
$24.74
How close can a scaffold be to a building?
6 inches
12 inches
Fastened to the building
All of the above
All of the above
At what height do scaffolds have to have safety rails?
7-1/2 feet
8 feet
8-1/2 feet
10 feet
7-1/2 feet
A contractor who will take the necessary time to study and apply the following basic principles will find himself well on the way toward establishing a sound financial policy.
Investment in the net fixed assets should be in proper proportion to owner’s equity.
Net working capital should be in proper proportion to sales.
Cash plus goods receivable should exceed current liabilities.
All of the above.
All of the above
The NEC states, Class-3 cables must have a voltage rating of at least:
600 V
24V
30 V
300 V
300 V
The best method for splicing singlemode fiber is_____.
cable weld
wire nut
fusion splice with strain relief boot
fusion splice with strain relief boot
If the electric utility provides service by way of overhead lines, the installation should:
be suitably grounded.
have a 60 ampere (minimum) service switch.
provide suitable overcurrent protection.
All of the above
All of the above
A dB meter is used to check and adjust sound levels in a room.
True
False
True
In a satellite antenna system, the downconverter passes on the signal to the receiver.
True
False
True
A construction worker has a complaint about working conditions; his/her first step is to:
ask to see the contractor.
give the problem to an arbitrator.
discuss the problem with his/her supervisor.
submit the problem to the union grievance committee.
discuss the problem with his/her supervisor.
In the NEC, ____ is the section covering optical fiber.
770
640
760
None of the above
770
An automatic backup warning device on a truck shall be heard a minimum distance of:
200 feet.
300 feet.
400 feet.
500 feet.
200 feet.
All occupied trenches ____ or more feet deep must be provided with exits at ____ foot intervals.
5 – 10
4 – 15
4 – 25
6 – 25
4 - 25
The part number for a RS-232 connector is:
DB-15
DB-25
DB-9
all of the above
All of the above
If a worker gets chemicals on his/her skin or eyes he/she should bathe the exposed area for:
2 minutes.
5 minutes.
10 minutes.
15 minutes.
15 minutes.
For most first or second degree burn victims, what should be done?
Provide CPR
Apply warm water or submerge burned area in warm water
Apply cold water or submerge burned area in cold water
Apply oil or cold cream to affected area
Apply cold water or submerge burned area in cold water
The maximum pulling tension for CAT 5 cables is ___ lbs.
75 lbs
220 lbs
25 lbs
25 lbs.
How many meters long can a single run of CAT 6 cable be in a building?
55 meters
45 meters
60 meters
55 meters
High A.C. voltages are usually measured with a:
voltmeter and current transformer.
millivoltmeter and shunt.
voltmeter and multiplier.
potential transformer and voltmeter.
potential transformer and voltmeter.
You should never look into the end of an active fiber optic cable.
True
False
True
Cal/OSHA publishes a booklet entitled ______________________. This booklet contains the minimum safety standards applying to construction.
Guide to Construction Safety
Construction Safety Orders
Contractors’ Guide to OSHA Regulations
Cal/OSHA Safety Regulations
Construction Safety Orders
For a 4-zone sound system, 8 speakers are required.
True
False
True
Chemicals come in various forms. What chemicals affect people in different ways?
Mist and vapor
Liquid and dust
Fume and gas
All of the above
All of the above
A punch down tool is used to attach wires to a terminal block.
True
False
True
Combustible dusts are present under operating conditions; which of the following classes best describes these conditions?
Class I Division 1
Class I Division 2
Class II Division 1
Class II Division 2
Class II Division 1
From where must the demolition work on floors and exterior walls progress? (Exceptions are permitted when explosives are used for demolition.)
Center down
Bottom to top
Top to bottom
Center up
Top to bottom
The ring wire is red in the primary wiring pair.
True
False
True
If 1/4″ on a scale represents 1′ -0″, 1/8″ represents:
3″.
4″.
5″.
6″.
6”.
If a volt-ohm meter needle indicates infinite ohms on the high ohm scale, this would mean that the switch or circuit is:
closed.
open.
underloaded.
overloaded.
Open
In a low voltage system, where does the blue wire go?
to a relay
to a switch
to the 120-V supply
to a relay
All lumber used in construction of scaffolds shall be Douglas Fir, not less than construction grade or material of equal strength.
True
False
True
