official flash cards construction seminars
1
Q
Nonshielded conductors over 750V
shall be _____
A
Grounded
2
Q
What is the minimum distance that is
allowed between switchgear and an
outdoor oil storage tank?
A
10 ft
3
Q
What is the minimum vertical separation
on a pole between the supply cable and
the lowest communication attachment?
A
16”
4
Q
The vertical clearance for insulated
communication conductors above or
crossing railroad tracks shall be ___feet.
A
23.5
5
Q
Minimum clearance for non-insulated
communication conductors over
pedestrian walkways shall be ____ feet.
A
12
6
Q
Minimum clearance of open supply
conductors over 750V to 22KV crossing
over bridges shall be ____ feet.
A
5.5
7
Q
The minimum vertical clearance between
ordinary supply conductors over 8.7 kV and
communication conductors shall be
____inches.
A
40 plus .4 per kV over 8.7 kV
8
Q
Backfill within 6” of conduit should be
free of solid material greater than ____
maximum dimension.
A
4”
9
Q
In underground structures, horizontal runs
of supply cables shall be supported at least ____
above the floor.
A
3”
10
Q
What is the minimum burial depth for
a 22 kV conductor?
A
30”
11
Q
What is the minimum flush burial
depth of a 500 volt conductor?
A
24”
12
Q
Bonding shall be provided between all
above ground metallic power and
communications apparatus that are
separated ____ or less.
A
6 ft
13
Q
According to the NESC, fall protection is required for over ___feet of elevation.
A
10
14
Q
A buried ___ shall be used to bond across a gate, unless a
nonconducting fence section is used.
A
bonding jumper
15
Q
Where guarding is required, grounding
conductor guards should extend for not
less than feet above the ground or
platform from which the grounding
conductors are accessible to the public.
A
8
16
Q
Strips of metal not less than____ in total length constitute an acceptably made electrode.
A
10 ft
17
Q
In areas with high soil sensitivity or shallow bedrock, buried strips of metal not less than in total length, constitute an acceptably made electrode.
A
10 ft
18
Q
Pole butt plates shall not be less than thick.
A
1/4”
19
Q
Copper wire wrap shall have a continuous bare length below the
ground level not less than___ feet.
A
12
20
Q
Copper wire wrap shall not be smaller than ___
A
6 AWG
21
Q
Minimum overhang for insulated communication conductors over roads and parking lots shall be feet.
A
15.5
22
Q
The supplier or contractor that installs house fire warning is required to provide the building owner with all the following materials except:
A
drawings that show the interconnection of tandem connected detectors
23
Q
On a beam ceiling where the beams are less than 12” in depth and spacing is less than 96”, where should the smoke detectors be mounted?
A
bottom of beam
24
Q
The maximum air velocity for a smoke detector is ____
A
300 fpm
25
Given: A smoke detection system is being installed to automatically close a double door way in response to smoke blowing in either direction. The ceiling is smooth. Where must the smoke detector be installed?
on the centerline of the doorway
26
Visible notification appliances located in corridors shall be space no more than ____ feet apart.
100
27
On a voice alarm system, what is the minimum number of cycles it has to report an evacuation procedure?
2
28
A single story dwelling unit has two bedrooms that are not located near to one another. What is the minimum required number of smoke alarms required?
4
29
Heat detectors used within a single family unit must be listed or approved for not less than spacing.
50'
30
What is a privately owned and monitored alarm system classified as?
proprietary system
31
What is a decibel?
1/10th of a bell
32
Notification appliances of a local protective signaling system must include____ on their nameplate?
Electrical requirements and rated audible or visible performance.
33
A fire alarm system is required or a visible notification device when the ambient sound is greater than?
105 dBa
34
What is the maximum blink rate on a strobe light on a notification appliance per second?
2
35
What is the maximum interval that a fire alarm signal is allowed at the console?
15 seconds
36
What is the detector that is mounted on the ceiling or wall that reacts to convected thermal reaction?
heat detector
37
Components that are non fire alarm and connected commonly to fire alarm components are considered what type of system?
combination system
38
Pad mounted equipment shall not be located less than___ feet from fire hydrants.
4
39
Electrical power is measured in
Watts
40
You have a frequency that has been amplified to four frequencies. This change is called:
frequency multiplexing
41
What type of network is not considered multipoint?
point to point
42
When a company ties together different devices such as computers and printers, what is the result?
a network
43
Which part of a power supply converts electrical current from AC to DC?
rectifier
44
The standard impedance of a video coaxial cable is ___ ohms.
75
45
Telecom wire is grounded on each end. What is the electrical path called?
ground loop
46
A voltmeter will test all of the following EXCEPT:
power
47
What are the disadvantages of fiber optics over copper?
cost
48
What is the measurement of the amount of signal for fiber optics?
Bandwidth
49
Switch S1 is in the on position but light L does not come on. Voltage across S1 is measured to be 120 volts. Voltage across L1 is measured to be 0 volts. The light does not come on because: the lamp is good but the switch does not ____
make contact
50
Which of the following materials is commonly used as an anode?
Magnesium
51
A length of coax used for data is terminated at one end with a 50 ohm terminator. The resistance between the shield and the center conductor at the other end of the cable is 0 ohms. This indicated the cable continuity is_____
Shorted
52
What is the potential difference between any two points in a circuit?
voltage
53
Ohms law states that the current is inversely proportioned to the Resistance What is the classification for a low voltage electrical system which current flows through continuously, except when the circuit is open to allow a signal to be sent?
Closed
54
Given: A purple light appears when the electrodec wire of a neon lamp is tested with a high tension spark coil. what is the gas pressure inside the tube?
a minimum of 50mm under green
55
Given: Two (2) electric discharge signs are identical except for the tubing. The tubing inside 'A' has a smaller diameter than the tubing inside 'B'. Which of the following statements comparing the two signs is true?
the load impedance in sign A is greater than that of sign B
56
Corrosion currents are usually measured in?
Milliamps
57
A brass service cock in a steel line would tend to become the:
Cathode
58
When the source and load impedance are made equal so that a maximum transfer of power occurs with minimal distortion, What has been accomplished?
Impedance matching
59
The ratio between a sound level that is just audible to a person with average hearing and other sound levels is indicated in?
Decibels
60
What device that corrects an impedance mismatch is used to connect cables to other cables or equipment?
Balun
61
The technician does not connect a terminator on an unused splitter port at the end of a TV distribution line. Which of the following errors may be caused?
signal reflections or ghosting
62
What keeps the alarm circuit activated and the output device operating even if the protective circuit is restored to normal?
latching relay
63
Office telecommunication cables are routed into designated local cable rooms that functions as remote cable distribution points for room connections. This strategy is called a:
3 point connection
64
What depth is a 40 foot wood pole set?
6 feet
65
A primary advantage that optical fiber has over copper cable pairs, is that a fiber optic transmission offers:
EMI immunity
66
Given: Hard wired alarm system control panels should be installed so that they help reduce magnetic downtime and false alarms. Electromagnetic interference must be prevented from entering the system control panel and causing interference. Which of the following eliminates EMI?
fiber optic cable
67
An ohmmeter reading of zero ohms indicates which of the following?
a short circuit
68
A voltmeter is used to measure:
electric pressure
69
An ohm meter reading of infinity indicates which of the following conditions?
Open circuit
70
Electrical pressure or electromotive force is measured in
volts
71
The ability of a material to PERMIT the flow of electrons through it is called?
conductance
72
All of the following are incandescent lamp base types except:
Standard
73
With the settings set to low on an ammeter, what will happen if you wrap the wire around twice?
Double the reading
74
An alternator produces what type of power?
AC
75
It is customary to refer to electromotive force as?
voltage
76
How are fuses rated?
both amperes and voltage
77
What procedure helps defeat tampering with a shunt lock on older systems?
wiring the shunt lock directly to the alarm panel
78
When a signal is detected, power is applied to the circuit triggering the annunciator and when power is no longer applied, the annunciator continues because of what relay type?
drop latch
79
All of the following are space detectors except?
bill trap detector
80
On an Electrical diagram, what does the symbol S2 indicate?
one double pole switch
81
What is the main function of the drop relay in an closed circuit security alarm system?
to latch the coil to keep the circuit in the alarm condition
82
Which of these detectors uses a microphone?
audio
83
How many volts should be expected between the red and white conductors on an energized circuit containing black, red, green and white conductors?
120 volts
84
One ampere is defined as the flow rate current per second of one:
coulomb
85
Which of the following opens and closes or interrupts the voltage or power?
relay
86
A television signal is measured in which of the following?
megahertz
87
Which one of these switching systems places many inter leveled telephone conversations onto one telephone line?
time division multiplexing
88
According to the Lineman's and Cableman's Handbook, is the advantage of wood distribution poles to concrete poles.
cost
89
According to the Lineman's and Cableman's Handbook, the recommended hole depth for a 50' wood pole set in soil is at least:
7'
90
The total opposition to AC in a circuit which includes resistance, inductance and capacitance is called?
electrical impedance
91
What connection using 3 resistors will provide maximum total resistance?
all 3 resistors in series
92
A current that leaves its intended path and returns to the source bypassing the load causes the circuit to be:
shorted
93
When installing a half inch format camera, looking at the building 30' away, and it is 18' in height and 22' wide, what is the mm lens size that is required?
8 mm
94
What is the benefit of a covert cctv system over an overt system?
catch a repeated offender
95
On a screen, what will give you the greatest number of views?
multiplexer
96
What is a conductor's insulation rating based on?
Circuit voltage
97
Which of the following affects the resistance of a conductor?
material
98
What type of output is preferred when selecting an amplifier for a 5 speaker public address system install?
ease of matching impedance
99
Windings in a transformer go around a:
Core
100
Cable TV coax can be tested by using what?
digital multimeter
101
What does CCTV stand for?
Closed circuit television
102
What is the maximum bandwidth of a standard television channel?
8 mhz
103
A three phase system has no voltage to the neutral load. What is the minimum size neutral needed?
No neutral needed
104
Which of the following is mandatory code:
NEC Article 770
105
What causes a sound system to hum/buzz?
ground loop problems
106
Which of the following has the most resistance?
Poor connection
107
What type of connector is used for RG- 6 cabling?
Type F
108
What is used to test batteries?
Voltmeter and load
109
What is another name for frequency?
Band
110
What does the number "2" represent in THW-2?
90°C Temperature Rating
111
What is the name of the typical coax connector?
Type F
112
An ammeter measures:
Current
113
Any intentional alteration of frequency response including tone control is termed
equalization
114
A crossover is confined to a band of frequencies for which a component is responsible. This is accomplished by:
a frequency dividing network
115
A CCTV signal is what type of signal?
Composite
116
Single mode fiber cable does not experience modal dispersion and is not limited by bandwidth, rather it is limited by
attenuation caused by the electronic devices within the system
117
Fiber cable splicing, which consists of aligning two clean fibers end to end and joining them with an electric arc, is called:
fusion splicing
118
You will find difficulty using UF cable underground because:
gophers will eat it
119
The face of a utility pole refers to:
The concave side
120
The top of a conduit system should be located not less than below the top of the rails of a street railway.
36"
121
The top of a conduit system should be located not less than below the top of the rails of a railroad.
60"
122
In a substation, SF6 equipment is installed. This refers to:
circuit breaker
123
A wattmeter measures:
power consumed
124
Transmission line voltage of 345 kV is classified as
EHV
125
Phasing out conductors involves the use of a phasing out voltmeter. It is safe to connect the lines when:
Voltmeter reads 0 volts
126
Phasing out conductors involves the use of a phasing out voltmeter. It is safe to connect the lines when:
Voltmeter reads 0 volts
127
What is the minimum separation between a communications cable and a 7.2 kV line in a manhole?
6"
128
ACSR stands for:
Aluminum conductor steel reinforced
129
Aerial conductors with scratches and nicks will have:
high corona
130
According to OSHA, fall protection must be used for employees working at elevated locations more than:
4 feet
131
OPT-GW stands for:
optic fiber ground wire
132
In a loudspeaker, what accomplishes the actual transduction of electrical signals into sound waves?
driver
133
All of the following are acceptable methods for lowering the resistance of a grounding rod except:
remove water
134
What is the maximum number of overcurrent devices permitted in a lighting and receptacle panelboard?
42
135
What is a cable that consists of four unshielded twisted-pair rated at 20 MHz?.
Category 4
136
Which of the following is the symbol for ohms?
Ω
137
Wood poles next to poles supporting long spans should ___
face away from the long span
138
A wire running from the attachment near the top of the pole to a rod and anchor installed in the ground is known as:
anchor guy or down guy
139
A T1 line has how many channels?
24
140
Category 3 cable wire is rated at:
100 MHz
141
A microphone is connected to what device?
mixer
142
Bundled cables are to be pulled:
simultaneously
143
The outer protective coating on a cable is referred to as:
jacket
144
Describe the characteristics of a digital signal
Pulse, no pulse
145
Describe the characteristics of an analog signal.
voltage that is variable with time
146
What device is used to measure resistance on a grounding rod?
digital resistance tester
147
Category 5 cable is rated at
100 MHz
148
Backfill within 6" of the conduit should be free of solid material greater in maximum dimension than:
4"
149
Conduit systems to be occupied by communications conductors shall be separated from conduit systems to be used as supply systems by ___of well tamped earth.
12"
150
Two computers directly connected to one another would be an example of a:
point to point network
151
A collection of links with a common node is an example of a:
star network
152
Multiple computers sharing a common line is an example of a ____
bus network
153
A network in which each computer is connected to two other computers forming a circle is called:
ring network
154
Tie wires are normally made of
annealed wire
155
Cables located in manholes must be
tagged
156
Most electric energy is generated at a voltage between:
13.2 - 24 kV
156
A reed switch is operated by:
A magnet
157
When an electric current leaves its intended path, it returns to the source, by passing the load, the circuit is:
Shorted
158
Which of the following converts AC to DC with no moving parts?
Rectifier
159
The rate of the flow of current is inversely proportionate to?
Resistance
160
What makes current flow?
Electromotive force
161
The rate of change through a cycle is expressed in:
Hertz
162
The instrument that bests test ground and insulation resistance is called?
Megger
163
What are the two principle effects of electrical current in a circuit?
Heating and Magnetic
164
When circuit components that are connected across the source they are called?
Parallel
165
When metals become hot, the resistance?
Increases
166
The rate of flow of current equal to electromotive force divided by resistance "I" represents?
Intensity
167
Instant start fluorescent lamps will not operate without a
Ballast
168
Watt hour is a measurement of the consumption of?
Power
169
Alternating current means the direction of current flow:
Reverses at intervals
170
Which of the following is used to correctly test busways (bus duct)?
volt/ohm meter
171
If service wires cross an alley, the minimum clearance to ground is
16 ft
172
The frequency of ac power generated in the US is Hz alternating current.
60
173
When an alternating voltage and the current which it causes to flow rise and fall in value together and reverse direction at the same instant, the two are said to be
in phase
174
An out of phase condition indicates that the current is usually the voltage.
lagging behind
175
What helps control voltages supplied to the customer by eliminating the voltage drop in the system caused by inductive reactive loads?
capacitors
176
A factor of___ is used with line voltage for all three phase calculations.
1.73
177
The distribution circuits that carry power from the substations to the local load areas are known as express feeders, distribution main feeders, or primary circuits and generally operate at voltages between:
2400 and 34,500 volts
178
Distribution transformers are installed in the vicinity of each customer to reduce the primary circuit to or other utilization required by the customer.
120/240 volts
179
The fourth wire is called____ the because it is connected to the neutral point of the Y connection.
neutral wire
180
The advantages of the four-wire feeder over the three-wire feeder are increased power carrying capacity and:
better voltage regulation
181
ABC is a 4160 Y / 2400 volt primary feeder obtained by tapping the three-phase wires, and AN, BN, and CN are single phase 2400 volt primaries obtained by tapping a phase wire and the neutral of the three-phase, four wire 4160 Y / 2400 volt feeder.
single phase circuits obtained from three-phase circuits
182
Any consumer having a single-phase motor larger than would likely operate it from the two outside wires of the secondary.
1/2 hp
183
The voltages normally used for three-phase secondary circuits are:
208Y/120 volts four-wire, 240 volts three-wire, 480Y/277 volts four-wire, and 480 volts three-wire
184
The primary and the secondary transformer neutral connections should be connected to the:
distribution feeder circuit neutral and to ground
185
Splices shall be at least from the nearest pole or structure.
50'
186
Two ground rods of each structure shall be connected by a no. 4 copper wire buried not less than ___ below ground.
12"
187
What is the pole setting depth?
10% +2 ft
188
Guys that are exposed to open supply conductors of more than ___ must be insulated.
300 volts
189
Aluminum wire must be___ times as large as the copper wires in the cross section to have the same conductivity.
1.60
190
Conductor spacers are used on to keep a uniform distance between ____conductors.
bundle conductors
191
In a shell type transformer:
the core surrounds the coils, instead of the coils surrounding the core
192
If one transformer from a delta- connected bank is removed, the remaining two are said to be:
open-delta connected
193
Hot lines tools are factory tested by the manufacturer at:
100,000 volts per foot
194
The insulation stick portion of the hot line tools is normally tested at____after delivery to the customer.
50,000 volts per foot
195
The grounded static wires for transmission lines and the grounded neutral wire for primary distribution circuits originate at:
Substations
196
Ground rods usually are driven ___ to meet requirements.
8 to 10 feet
197
If when the rod is driven to its full length it is found the resistance is not well below ___resort to one of the following procedures: extend the length of the rod or drive additional ground rods.
25 ohms
198
A common conductor on the transformer secondary for a single phase___ volt service must be grounded.
120/240
199
The neutral conductor of the service to the customer must be connected to ground on the customer's premises at:
the service entrance equipment
200
A ground rod for a distribution system shall be driven until the top end is ___below ground level.
2'
201
The size of the ground wire shall not be less than:
6 AWG copper wire
202
The installation of protective grounds and short- circuiting leads at____ protect against the hazards of static charges on the line, induced voltage, and accidental energizing of the line.
the work site
203
Duct runs should be slightly graded. They should slope gently toward one or both manholes, thus allowing any water that may seep in to drain to one of the manholes. Good practice requires the slope be:
no less than 3 in for every 100 feet
204
A manhole opening having a minimum diameter of___ is recommended.
32"
205
The inside vertical height of two-way manholes should not normally be less
than:
7' or more than 8'
206
Where supply cables and communication cables must be racked from the same wall, the supply cables should be racked___ the communication cables.
below
207
In general, rubber-covered cable with a synthetic jacket should be shielded when applied to systems____
over 3000 volts
208
The top of the conduit system should be located not less than ____the top of the rails of the street railway or of the rails of a railroad.
36" below; 60" below
209
Round access openings in any manhole containing communication cables only, or manholes containing supply cables and having a fixed ladder which does not obstruct the opening shall be not less than ____inches in diameter.
24
210
In manhole construction, a cable should be supported at points from each end of the splice. Additional racks are spaced about____ apart depending on the nature of the cable bends.
6"; 3 to 4 1/2 feet
211
A ___ copper wire is generally used when bonding and grounding cable sheaths in order to maintain them at or near ground potential.
no. 2 AWG
212
Supply cables should not be installed within___ feet of a swimming pool or its auxiliary equipment.
5
213
The horizontal clearance between direct buried cable and other underground structures shall be
controlled at a minimum of ____or larger.
12 inches
214
Pole climbing equipment consists of:
body belt and safety strap and a pair of climbers
215
Rubber gloves should always be given ____by the lineman or cableman each day before work.
an air test
216
Live-line tools used for primary employee protection shall be removed from service every __ years for examination, cleaning, repair and testing.
2
217
When disconnection equipment or lines from and energized circuit by means of a conducting wire or device, an employee shall remove the___ first.
source end
218
What is the advantage of a single- ended beam detector vs. a double- ended beam detector?
a double beam requires more installation
219
What is the proper method for testing a smoke alarm in a two family dwelling?
follow manufacturer's instructions
220
A 12 volt circuit with a 21 ohm resistor is being tested with the switch closed. The reading shows
1.2 volts. What is the problem?
Bad switch
221
Which of the following is not a cause of an intermittent trouble fault condition (swinger)?
low battery
222
Wire tongs are used to hold
live conductors
223
When voltage is generated at the power plant what happens to it prior to transmission?
goes through a step up transformer
224
Hardhats are designed to withstand how many volts?
20,000 volts
225
A bell and battery set was tested and was found to be functioning properly. Two 12 AWG conductors were pulled through a conduit and attached to both sides of a battery and bell set. When the other ends were twisted together, the bell did not sound. What is the likely problem?
open circuit
226
What type of microphone provides the least amount of transient distortion?
condenser or ribbon microphone
227
What type of microphone provides the most transient distortion?
moving coil
228
How would someone check a coax cable to make sure it is good?
test for resistance
229
Pole fires can be extinguished with:
a dry-chemical fire extinguisher designed for class C fires
230
Most telephone cable is comprised of solid ___gauge copper wire
24
231
All of the following are considered good insulators except
carbon
232
What is needed for a florescent bulb to work?
phosphor coating, inert gas, electrode
233
Normally the largest solid conductor is
1/0
234
Shield (static) wire is run at an elevation
above the line conductor
235
Shield (static) wire is run at an elevation where?
above the line conductor
236
On a ACSR conductor, when splicing first brush the aluminum and then coat the brushed conductor with an ___
inhibitor-type compound
237
A digital signal is a signal consisting of
power on or power off
238
What is a RG-8V cable?
coax
239
An underground insulated cable has a fault. The fault is located and dug up. What do you use to ground it?
cable spear
240
If the voltage range is 600V to 12,000V what is it considered?
medium voltage
241
If the voltage and the amperage are moving simultaneously (in sync with one another), what does that mean?
in phase
242
A fault is being located in an underground conductor that terminates at a transformer. Where do you ground the conductor prior to splicing?
at the fault location using a cable spear
243
If you were putting in a cable connection for CCTV, what connector would you use?
BNC connector
244
When a microphone is connected to a mixer, what do you use to increase and decrease the volume?
fader
245
A combined increase in signal strength of intensity and voltage is known as
gain
246
A network in which a computer is connected to two other computers is called
bus network
247
What is the desired resistance of a driven ground rod?
25 ohms or less
248
GFCI receptacles are designed to trip at mA.
4-6
249
The power factor can be defined as the ratio of the actual power to the of the apparent power (volts x amps).
product
250
Force that moves electricity down a conductor is known as:
voltage
251
What is the device that translates audio signal voltage into actual sound waves?
driver
252
Where do you ground your overhead wire when you are working on high voltage lines?
at the substation
253
Three phase current consists of three different alternating currents out of phase degrees from one another
120
254
What device changes one type of energy to another type of energy?
transducer
255
What device with no moving parts changes voltage?
transformer
256
The temperature of a transformer is
critical
257
Where is a distribution substation located?
middle of load area
258
Cables are racked in a vault or manhole to allow for
expansion
259
Where are subtransmission substations located?
urban areas near high concentrations
260
In a substation, where are lightning arrestors located?
near aerial circuits or power transformers
261
The atom of hydrogen gas has electron. The atom of lead has
electrons.
262
If a lineman is working on a switch, where would it be grounded when it's being worked on?
at the work location
263
Underground-cable conductors terminating in pad-mounted transformers can be isolated, tested, and grounded where?
at the transformer location
264
What is classified as a high voltage system?
system voltages over 69,000 to 230,000 volts
265
What is classified as an extra-high voltage (EHV) system?
system voltages over 230,000 to 1 million volts
266
When joining ACSR conductor, before crimping you should brush and coat it with an inhibitor type
compound
267
A three phase distribution transformer will have what on it's primary side?
high voltage
268
Voltage at a generator station is generally
Stepped up
269
The most common type of AC waveform is
Sine wave
270
What connector type is used on Cat 5 cables?
8 pin RJ-45
271
Which law states that like charged objects repel and opposite charged objects attract?
Coulomb's Law
272
On a three phase, 4 wire system, the ground is connected to what phase?
Neutral
273
The ability of a component to spread out the sound to a certain angle is known as
dispersion
274
The oil temperature in an oil immersed, self cooled transformer should be at ___or less.
80°C
275
Which of the following microphone types involve the use of a substance that is twisted or deformed when sound waves pass?
piezoelectric
276
On an optical fiber cable, what is the immediate covering over the core called?
cladding
277
Where transmission lines use bundled conductors, what is used to keep the bundles from wrapping together?
conductor spacers
278
When does volt amps equal watts?
when the power factor = 1.00 or 100%
279
Distribution transformers connect to
the primaries
280
"Low Voltage" are systems that are operating less than ?
50 v
281
Feeders entering substations are typically located
underground
282
The flow of electrical current is known as
amperage
283
