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VDV Practice Test

This Practice Test will help you prepare to take the California VDV Certification Exam. These practice tests are randomly generated from several hundred questions covering various areas of the VDV scope of work. Be sure to also read the informational documents available on this website.


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
You are pulling feeder cables to a MUTOA through a fire wall, what are the requirements?
a.
Cut a hole just big enough for the cable
c.
Cut a 3” hole and fire caulk
b.
Cut a 2” hole and fire caulk
d.
Check the requirements for that rated wall
 

 2. 
What is the typical AWG size for a series 6 center conductor?
a.
18 AWG
c.
22 AWG
b.
16 AWG
d.
14 AWG
 

 3. 
Adjusting a room acoustically, you would use ______ noise.
a.
Pink
c.
Music
b.
White
d.
intermittent
 

 4. 
What is the 1st step when certifying a data link?
a.
Calculate wire length
c.
Wire map
b.
Determine wire type
d.
Calibrate testers
 

 5. 
What is a Wiegand reader?
a.
A type of bar code reader
c.
A specific format used in card readers
b.
A high speed optical reader
d.
A device used with wireless access point to verify data integrity
 

 6. 
Measurement of AC resistance is called?
a.
Ohms
c.
Impedance
b.
Mhos
d.
None of the above
 

 7. 
Which is the general formula for electric power?
a.
P= I x R
c.
P=V / R
b.
P= I x E
d.
P= I / R
 

 8. 
Category 5 cables exhibit ________ attenuation than category 3 cables.
a.
lower
c.
same
b.
higher
 

 9. 
The nominal voltage supplied from the telephone company on public telephone lines(except during ringing) is ________.
a.
24 VDC
c.
120 VAC
b.
48 VDC
d.
48 VAC
 

 10. 
In a typical wiring, the blue-white pair is used for:
a.
Control functions
c.
Bridging
b.
Tip & Ring
d.
None of these
 

 11. 
Where do you use bridging clips?
a.
An RJ-31X
c.
Telephone switching system
b.
A 66 block
d.
Across Tip & Ring line
 

 12. 
A ______ modular jack contains connection points for two telephone pairs.
a.
RJ-11
c.
T1
b.
RJ-45
d.
DTMF
 

 13. 
__________ was devised so that a transmission path can carry many telephone conversations at the same time.
a.
Dial tone
c.
Tip/ring
b.
Asynchronous transmission
d.
Multiplexing
 

 14. 
Proper respirator fit may be prevented by:
a.
A person’s physical face structure
c.
Excessive facial hair
b.
Glasses with temple pieces
d.
All the above
 

 15. 
Choose the item(s) required to make a simple CCTV system work.
a.
camera and lens
c.
monitor
b.
cable
d.
all the above
 

 16. 
Loose tube type fiber cable is:
a.
Usually used outside
c.
May require a “break out kit”
b.
Made to allow for expansion and contraction as temperatures change
d.
All of these
 

 17. 
Choose the method(s) indoor pan/tilt platforms can be mounted.
a.
bracket mounting
c.
below the ceiling
b.
ceiling mounted
d.
all of these
 

 18. 
The cathode end of a diode is often marked with:
a.
a bright color
c.
the letter “C”
b.
a band
d.
a red dot
 

 19. 
According to the NEC, metal cable trays and wire ways ________ bonded to ground.
a.
shall not be
c.
will be
b.
shall be
d.
will not be
 

 20. 
What is the energy limitation for a CATV system as qualified by the NEC?
a.
24 VAC
c.
60 Volts
b.
12 VAC
d.
12 VDC
 

 21. 
Which of the following optical fiber cables are permitted to be installed in cable trays?
a.
OFCP
c.
OFN
b.
OFCR
d.
all of these
 

 22. 
The main cause of job-related eye injuries is:
a.
Electrical hazards
c.
Dust or powders
b.
Lasers
d.
Flying objects or particles
 

 23. 
Which of the following best describes the term “transceiver”?
a.
Electronics to support transmitting and receiving
c.
Electronics to stop overheating
b.
Electronics to prevent feedback
d.
Receiver
 

 24. 
Near end Crosstalk (N.E.X.T) is:
a.
Desirable in almost every installation
c.
Undesired induction of a signal from one pair to another
b.
Needed for the digital network to work flawlessly
d.
Measured at the far end of the cable for best results
 

 25. 
What is the proper way to ascend and descend a ladder?
a.
facing away
c.
facing towards
b.
carrying material
d.
both b & c
 

 26. 
Anti-passback is a feature normally found in which type of system?
a.
Sound system
c.
Access system
b.
Burglar alarm system
d.
CCTV system
 

 27. 
An LED can be designed to emit:
a.
visible light or infrared light
c.
only infrared light
b.
only visible light
d.
visible light or ultraviolet light
 

 28. 
Choose the type(s) of device(s) for electronic decisions.
a.
detection device
c.
action device
b.
management device
d.
all of these
 

 29. 
The unit used to specify the amount of resistance in a circuit is the:
a.
Volt
c.
Ampere
b.
Ohm
d.
Coulomb
 

 30. 
When using 24-volts AC to power CCTV equipment, you would use a __________ transformer.
a.
class 1
c.
rectifying
b.
class 2
d.
step-up
 

 31. 
What is it called when data is transmitted in both directions simultaneously?
a.
full-duplex communication
c.
time-division multiplexing
b.
half-duplex communication
d.
two-way multiplexing
 

 32. 
Loudspeakers that operate below 300 Hz only are called ______.
a.
midrange
c.
super-tweeter loudspeakers
b.
subwoofers
d.
tweeters
 

 33. 
The purpose of a block diagram is to present the _______ of the equipment in a simple, readily accessible form.
a.
current flow
c.
measurement process
b.
logical structure
d.
wiring diagram
 

 34. 
The nominal voltages supplied by telephone companies in the United States are _______ volts for voice circuits and _____ volts for ringing circuits.
a.
12 / 24
c.
48 / 90
b.
24 / 48
d.
50 / 100
 

 35. 
A(n) _________ combines multiple signals, provides input selection, and allows signal control.
a.
amplifier
c.
mixer
b.
equalizer
d.
transformer
 

 36. 
What is the best way to protect against voltage spikes in a DC circuit?
a.
add a capacitor across the contacts
c.
use an in-line fuse on the common wire of the contact
b.
add a diode across the relay coil
d.
use an isolation transformer
 

 37. 
The maximum recommend length for a single-section ladder is ______ feet. 
a.
20
c.
40
b.
30
d.
50
 

 38. 
_______ are the most common shock-related injury.
a.
Amputations
c.
Burns
b.
Broken bones
d.
Falls
 

 39. 
Which article in the National Electrical Code would you reference to answer a question about Grounding?
a.
Article 90
c.
Article 250
b.
Article 100
d.
Article 500
 

 40. 
________ and _______ are the two types of delay measured in a cable test.
a.
Delay skew/ NVP
c.
Propagation delay/ Delay skew
b.
NVP/ return loss
d.
Propagation delay/ NVP
 

 41. 
How should tools and material be transferred to your partner when working on a scaffold?
a.
accurately tossed
c.
not at all
b.
slid along the walk board
d.
carefully passed
 

 42. 
The _______ is the unit of area used to measure the cross sectional area of wire.
a.
circular inch
c.
square inch
b.
circular mil
d.
square mil
 

 43. 
Convert the following value- 212 mA = _______ amps
a.
0.000212
c.
0.212
b.
0.0212
d.
212
 

 44. 
Which type of voltage can be tested using a solenoid-type voltage tester?
a.
AC voltage
c.
battery voltage
b.
AC and DC voltage
d.
DC voltage
 

 45. 
Chapter 8 of the NEC covers ___________ systems and is not subject to the requirements of the other chapters except where they are specifically referenced therein.
a.
communications
c.
grounding
b.
computer
d.
definitions
 

 46. 
A force that pushes electrons through a circuit is called _________.
a.
resistance
c.
power
b.
current
d.
voltage
 

 47. 
Which article in the National Electrical Code would you reference to find the DEFINITION for a signaling circuit?
a.
90
c.
250
b.
100
d.
725
 

 48. 
Convert 0.2 amps to milliamps.
a.
0.0002 mA
c.
200 mA
b.
20 mA
d.
2000 mA
 

 49. 
When power sources are connected in series, the total voltage is equal to the ______ of the individual voltages.
a.
average
c.
highest
b.
difference
d.
sum
 

 50. 
The total power consumed in a parallel circuit is _________ the power consumed in each branch.
a.
always less than
c.
the reciprocal of
b.
the product of
d.
the sum of
 



 
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