C 7 Test 3
According to Article 800 of the NEC, cables installed in building locations other than plenums or risers must be Type CMG or Type CM. However, the NEC allows several exceptions for Type CMX communications cable less than _____ in diameter.
.25"
If material containing more than _____ asbestos is sanded, ground, sawed, cut, etc., so as to produce dust, such operations must be reported to DOSH
0.10%
Horizontal nonmetallic wireways must be supported at least every:
10 ft - Horizontal nonmetallic wireways must be supported at intervals not to exceed 3 feet, and at each end or joint, unless listed for other support intervals. However, the distance between supports should never exceed 10 feet.
According to the NEC, No. 16 copper conductors run in vertical raceways must be supported every:
100 ft
According to the NEC, No. 18 copper conductors run in vertical raceways must be supported every:
100 ft
In new construction, smoke detectors are powered by:
120-V ac circuit wiring
Doorbell wiring ranges from No. _____ AWG to No. _____ AWG
18 ... 22
The minimum wire size to supply the primary coil of a transformer used to supply a class 2 or 3 circuit is:
18 awg
According to the NEC, conductors of Class-2 or -3 remote-control circuits must be separated from conductors of light, power, or Class-1 circuits by at least:
2 in
You must keep stereo-speaker wires at least _____ away from exposed power wiring.
2 in
According to the NEC, for Class 2 or 3 remote-control, signaling, and power-limited circuits, transformers or other devices supplied from electric light or power circuits must be protected by an overcurrent device rated at not more than:
20 amps
Which wire should be used to cross-connect a standard telephone connection?
24 AWG solid
For a remote-control circuit, a transformer usually steps down the 120-volt supply to a nominal:
24 V
A low-voltage switching system typically operates at:
24 V ac
How many relays can be affected by a single switch?
25
A motorized master control device can typically control up to:
25 circuits
PVC conduit less than 1.25 inch nominal size must be supported at least every:
3 ft
According to the NEC, primary batteries are acceptable as inherently limited power sources for Class-2 remote-control circuits provided that the voltage is no greater than _____ and the capacity is equal to or less than No. 6 carbon zinc cells connected in series.
30 volts
According to the NEC, Class-3 cables must have a voltage rating of at least:
300 V
One cycle represents:
360 degrees
Vibration detectors in a burglar-alarm system should be installed _____ above floor level and _____ apart.
4-5 feet ... 2.5-6 feet
Use at least _____ cable to accommodate lighted phone dials.
4-wire
Non-rigid metallic conduit must be supported at least every:
4-½ feet - Horizontal runs of FMC (Flexible Metal Conduit) must be supported every 4-1/2 feet and must be securely fastened in place within 1 foot of a box, cabinet, or termination. Although this terminology may not be commonly used in the field, it is very likely that it will appear on your State exam. This answer is based on the NEC Section 348.30(B)
Flexible metal conduit must be supported at least every:
4-½ ft
In a telephone system, REN refers to Ringer Equivalence Number. Five 1-REN phones equal 5 RENS. Ten ½-REN phones equal:
5 RENS
According to NFPA 74, the maximum distance between smoke detectors on the same floor of a building is:
50 ft
The NEC requires that all 125-volt single-phase 15- and 20-amp receptacles installed within _____ of a residential kitchen sink and serving a countertop be equipped with a GFCI.
6 ft
According to the NEC, the insulation of Class-1 conductors must be suitable for up to:
600 V
NFPA _____ governs the installation, maintenance, and operation of signaling systems to provide central station fire-alarm and supervisory services.
72
NFPA _____ governs the selection, installation, operation, and maintenance of residential smoke detectors and fire warning equipment.
72 - The NFPA 72 "covers the application, installation, location, performance, inspection, testing, and maintenance of fire alarm systems, supervising station alarm systems, public emergency alarm reporting systems, fire warning equipment and emergency communications systems (ECS), and their components.
In a typical satellite antenna system, the receiver is connected to the television by:
75-ohm coaxial cable
According to the NEC, No. 0000 AWG copper conductors run in vertical raceways must be supported every:
80 ft
You have just installed a 12-volt lighting system. You know that all the wiring from the transformer to the end of each bulb is in good order, but none of the bulbs light. What is the most logical step to check for the solution?
Check the wiring from the transformer to the GFCI, Check the voltage drop from the transformer, Assume that the transformer is defective and replace it - None of the above - Keep in mind that this question is asking you to pick the BEST answer out of the choices given. D. Answer C is close, but it is not worded exactly correctly. While the transformer is likely to be defective, you cannot simply assume it is defective. First check that the fuses or circuit breakers are intact. Then check the 12-volt output leads the transformer. If the output is insufficient, then it's time to replace the transformer.
Remote-control and signal circuits are classified by the NEC as:
Class 1, 2, or 3
How should you care for a person in a state of shock?
Keep victim lying down to improve circulation and reduce pain and call for emergency medical assistance.
Wiring used to ground a telephone company's incoming cable sheath and protector is no smaller than _____ or its equivalent.
No. 14 AWG copper
According to the NEC, for Class-1 remote-control circuits, overcurrent protection must not be greater than 10 amps for a conductor sized:
No. 16
According to the NEC, Class-3 single conductors must be no smaller than:
No. 18
According to the NEC, for Class-1 remote-control circuits, overcurrent protection must not be greater than 7 amps for a conductor sized:
No. 18
What is the proper procedure when bending EMT with a hand bender?
Pull handle towards you while applying pressure to the heel of the bender with your foot.
According to the NEC, when may you run power-supply and Class-1 conductors in the same raceway?
When installed in factory- or field-assembled control centers
When installing the ground for a telephone system, you should attach the ground to:
a conductor system originally installed when the building was constructed.
According to the NEC, a riser is:
a vertical shaft that spans two (or more) floors
Current-carrying capacity is known as:
ampacity
An ohm represents the amount of electrical resistance that allows current to flow at the rate of one _____ under a pressure of one _____.
ampere ... volt
The maximum instantaneous volume of ac voltage or current is known as a(n):
amplitude
According to the NEC, a plenum is:
an air-handling space where several ducts meet
To stop the bleeding of a wound:
apply pressure directly over the wound
In which of the following is a GFCI required by the NEC?
bathroom
The portion of a circuit that extends beyond the final overcurrent device is called the:
branch circuit
At a construction site, hard hats should be worn:
by everyone
What should you do to help a victim with a fractured bone?
call for emergency medical assistance
Which of the following is used to store electrical energy?
capacitor
How should you care for a victim of electrical shock after he or she is freed from the power supply?
check to see if the victim is still breathing and if there is a heartbeat; if not, apply CPR
A cable with two insulated conductors concentric to each other is called:
coaxial
The interconnection of electronic data-processing and computer equipment not within a data-processing room is most often associated with:
coaxial cable
Another term for an inductor is a:
coil
Before using a keyhole saw to install a recessed ceiling light, what do you do?
drill a hole large enough for the saw blade
You are troubleshooting a 120-volt outdoor lighting system. The circuit breaker repeatedly trips. Which of the following is likely to be the cause?
either A or B
Which of the following would you use to locate underground cable or conduit?
electronic metal detector
To read the current in a two-conductor circuit using a meter with transformer "jaws":
encircle one of the conductors with the meter's jaws
Where there is a likelihood of eye injury from flying particles or from light, the employer must provide:
eye protection
Starting at random or failure to start by a rapid-start fluorescent light fixture is often caused by:
failure to securely ground
In general, to get a good stereo effect when installing speakers for a sound system, place the speakers:
fairly far apart and fairly far from the control center
Which of the following must be supplied at all work sites?
first-aid kit
If workers are exposed to cuts, burns, or corrosive or irritating substances, the employer must provide:
hand protection
Employees exposed to flying or falling objects and/or electric shock or electric burns must wear:
head protection
In which of the following locations may you not use rigid PVC as a conduit?
in an HVAC duct
If a rapid-start fluorescent light fixture fails to start even if its tubes are good and the unit is properly grounded, the next most likely cause is:
inadequate cathode voltage
What do you use to bend nonmetallic conduit (PVC)?
infrared heating unit
Which of the following is not a type of Cal/OSHA citation?
judicial
In a basic telephone system, the connection between the building to the central office is known as the:
local loop
Splices in doorbell wiring:
may be made at any point in the circuit (no junction box required)
Using a bulb whose wattage is higher than the maximum recommended rating for the fixture can result in:
overheating, damage to recessed incandescent fixtures - both of the above
Any channel designed expressly and exclusively for holding wire, cables, or bus bars is called a(n):
raceway
A circuit that controls other circuits or parts thereof through devices such as relays is called a:
remote-control circuit
The electrical device that most resembles, by analogy, a valve in a water system is a(n):
resistor
Which of the following is not considered a Class-1 remote-control circuit?
room thermostat
What is the best way to free a person being electrocuted from the power supply?
shut off the power immediately; if this cannot be done, separate the victim from the power supply by means of a non-conductive material such as a dry coat
A circuit that energizes devices designed to give visual or audible signals is called a:
signal circuit
An electromagnet having a movable iron core is called a(n):
solenoid
Where is it permissible to use a Class 2 circuit for the control of residential lighting?
stairways, halls & outdoor entrances
People with pacemakers should not work with:
telephone wiring
You are troubleshooting a 120-volt outdoor lighting system. One of the fixtures does not light. Which of the following is NOT likely to be the cause?
the circuit breaker is tripped - This is asking for the BEST possible answer out of the options given. Out of the other three answer choices Answer "D" would be the best.
You are troubleshooting a 120-volt outdoor lighting system. One of the fixtures does not light, but when the bulb is moved to another socket it works. Which of the following is the most likely cause?
the lamp-socket contact is faulty
The proper location for a telephone outlet intended for an office desk phone is:
the same height as the power box (14" above the floor)
A GFCI protects principally:
the user
You are troubleshooting a 120-volt outdoor lighting system. One of the fixtures does not light. After replacing the bulb, what is your next step?
turn off the power and check with a voltage tester to make sure it's off
Bell wire with low-voltage insulation may enter an outlet box or switch box containing light or power conductors:
under no circumstances
For burglar-alarm systems, the most economical way to detect an intruder breaking through a wall or ceiling is to install:
vibration detectors
The alternation of an ac circuit is due to the reversal of:
voltage
Vibration detectors in a burglar-alarm system are best installed on:
walls
Asbestos at a jobsite should be handled
wet
When would an electrician be likely to get the most use of an adjustable crescent wrench?
when installing and removing compression couplings on thin wall conduit
Cal/OSHA inspectors will arrive at your office or jobsite:
without an appointment
To serve a lighted phone dial, connect the _______ wire(s) to a 6-V transformer.
yellow and black
