Name:    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.

If you have two resistors in series with 12 volts across each resistor what is the voltage at the source?
 a. 12 volts c. 6 volts b. 24 volts d. 0 volts

2.

Today’s LAN structure uses what topology as the most common use for cable installation
 a. Bus c. Daisy chain b. Ring d. Star

3.

In an A/V system, which cable is considered the highest quality?
 a. Component c. RGBHV b. Composite d. S-Video

4.

 a. Cheaper in price c. More durable b. Quicker to terminate d. Longer distance/bandwidth

5.

The total opposition to the flow of electrons is?
 a. Impedance c. Resistance b. Current d. Both a & c

6.

 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

7.

A compression driver is:
 a. a seal-tite fitting used on high conduit joints to prevent leakage b. software used to compress a hard disk c. the device that produces the high or mid frequency energy that is fed into a horn or other relating device d. a subwoofer

8.

In audio systems the term “signal level” is equal to_________?
 a. amplitude c. volume control b. strength d. both A & B

9.

What does “T/R/S” stand for in an audio system:
 a. tight, round, straight c. tip, ring, sleeve b. tough, record, sleeve d. toss, recycle, safety

10.

Which Ohm’s Law formula is correct?
 a. I=V x R c. V=R / I b. V=I / R d. I=E / R

11.

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

12.

When measuring current in a circuit, what type of meter is commonly used?
 a. voltmeter c. ammeter b. ohmmeter d. watt meter

13.

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

14.

Low voltage systems are not capable of electrocution because:
 a. current is to low c. Both A and B b. voltage is to low d. Low voltage systems can cause electrocution

15.

The ABC’s of CPR are:
 a. Assess Breathing Constantly c. Airway, Breathing and Circulation b. Action, Basics and Control d. Assess, Basics and Control

16.

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

17.

According to the NEC, class 1 power limited circuits shall be supplied by a source having a rated output of not more than:
 a. 70V aand 1000 volt-amperes c. 30V and 1000 volt-amperes b. 10V and 1000 volt-amperes d. None of these

18.

Two of the typical wavelengths used in fiber optic transmission are:
 a. 675 and 1350 nanometers c. 850 and 1300 nanometers b. 450 and 900 millimeters d. 800 and 1200 nanoseconds

19.

In a 70 volt speaker system, the audio is distributed at a higher voltage and the stepped down at each speaker using a __________.
 a. amplifier c. power supply b. transformer d. receptacle

20.

Going off-hook closes _____ loop to generate a service request and the Switch returns a dial tone.
 a. the ground c. the trunk b. the current d. the tip/ring

21.

Which zone, on a burglar alarm would an exterior door contact be wired?
 a. Interior c. Perimeter b. 24-hour holdup d. Local access

22.

Optical fiber cable is covered under which of the following Articles of the NEC?
 a. Article 770 c. Article 810 b. Article 800 d. None of these

23.

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

24.

What is the most popular fiber for networking?
 a. coaxial c. multimode b. U.T.P d. singlemode

25.

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

26.

When measuring resistance in circuit for a professional sound system, one would use a(n)___________.
 a. ammeter c. impedance bridge b. spectrum analyzer d. None of these

27.

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

28.

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

29.

The ______ test verifies the pair to pin termination at each end and checks for errors.
 a. attenuation c. channel b. N.E.X.T d. wiremap

30.

What is the most common type of equipment used for video annotation?
 a. switcher c. monitor b. sharpie d. time/date generator

31.

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

32.

A screwdriver may be utilized as a substitute for:
 a. Chisel c. Hole punch b. Pry bar d. None of these

33.

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

34.

If cameras are to be used covertly at night, what type of light source should be used?
 a. infrared c. ultraviolet b. sodium d. visible

35.

What does the format size determine in a camera?
 a. focal length, focus range and lens length c. lens length, focus range and weight b. focal length, lens size and resolution d. resolved length, focus size and camera length

36.

What things need to be considered when installing pan/tilt units?
 a. Is there enough horizontal clearance for the total movement required? c. Will this unit be subject to wind-loading b. Is there enough vertical clearance for the total movement required? d. all the above

37.

Which of the following is a common use for a distributed sound system?
 a. background music c. room stereo systems b. intercoms d. all the above

38.

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

39.

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

40.

What device is used to boost a weaker audio signal to a level suitable for further mixing and signal processing?
 a. amplifier c. mixer b. mixing console d. preamplifier

41.

Which of the following best describes acoustic feedback?
 a. echo effect c. low pitched squeal b. high pitched squeal d. both b and c

42.

The _____ the impedance of the path, the ________ the current that will flow through the overcurrent device.
 a. lower / lower c. higher / higher b. lower / higher

43.

What designation is expected to be printed on communication cables listed for use in risers within an office building?
 a. CM c. CMR b. CMO d. CMX

44.

Multiple telecommunications rooms on the same floor shall be interconnected by a minimum of one ___________ inch conduit or equivalent pathway.
 a. 1 1/2 c. 2 1/2 b. 2 d. 3

45.

A _______ is used to measure optical power.
 a. dispersion meter c. power meter b. light source d. volt ohmmeter

46.

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

47.

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

48.

If you increase the voltage in a series circuit, the current will _________.
 a. decrease c. increase b. double d. remain the same

49.

The unit of electromotive force is the _______.
 a. ampere c. ohm b. volt d. watt

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