OCP B Exam Review Flashcards
An electric strike that opens in case of a fire alarm, sprinkler alarm, or loss of AC power is called _____.
fail-safe
HDTV uses _____ compression and encoding for transmission.
MPEG-2
In a commercial application, an HVAC system may be interfaced with the fire alarm system to _____.
shut down the HVAC system in case of a fire
The most common form of distortion created by an amplifier is _____ distortion.
harmonic distortion
Virtually all domestic electrical services in the world are:
single-phase
Select a _____ filter if it is required that all frequencies except those in a limited range must pass.
band-pass
The fact that a CCTV or MATV signal will fade over distance and may no longer be able to drive a monitor or receiver is called _____.
attenuation
The purpose of a noise gate is to _____ very low-level input channels.
turn-off
The aspect ratio refers to a display’s width measurement to its height measurement. The aspect ratio of HDTV is _____.
16:9
The goal of sound masking is to _____.
reduce ambient noise
Video cameras typically use _____ for power.
12-volt DC
When equipment in a sealed rack must be kept cooler than the room ambient temperature, a(n) _____ is used.
fan trays
A signal level meter (SLM) is normally used to display _____.
signal strength
Speaker cables should not be twisted much, because twisting _____.
can cause interference
_____ light is not visible to humans.
Infrared
Initial individual component tests are usually performed in the _____ phase of installation.
construction
The first step you should take when troubleshooting a system problem is _____.
identify the symptoms
When working with CCTV and video cameras, the reflectivity of an object is its _____.
luminance
_____ are optional devices that are used to insulate a rack from the floor or other building surfaces to prevent the rack from being inadvertently grounded to the building structure or other grounds.
Isolation pads
A hum or hiss in a sound system is usually a(n) _____ problem.
Wiring
The most common problem encountered when using data cabling (Cat 5e, Cat 6, etc.) for transporting video is _____.
delay skew
If a flown speaker has a four-point suspension, at least _____ point(s) must be used.
two
Access control systems are defined as the computers and application software along with all locking devices and coded credentials used to _____.
authorize passage through entry control systems
Analog television produces a picture with an aspect ratio (width-to-height) of _____, whereas digital television aspect ratio is _____.
4:3 and 16:9
Sound levels greater than _____ dB can cause permanent hearing damage.
120 dB
The goal of commissioning is to make sure that _____.
systems perform as intended
The ideal input (AC) power will be of constant _____.
voltage
The key to integration is the _____ among the user and components of the integrated systems.
Communication
The purpose of Acoustic Treatments is _____?
to improve the sound quality within a space
Use a(n) _____ to view the video from two cameras on a single monitor.
video multiplexers
A cabling scheme that has been designed to handle both analog and digital video but has a critical length requirement is _____.
DVI-I
A hand/finger geometry reader is a type of _____.
biometric authentication
Color TV video signals must carry three basic types of information: _____.
Brightness, color, and synchronization
In the _____ layer OSI model, the layer that defines the physical and electrical specifications of the actual connection of a device is layer 1.
Physical Layer
The height of a sound wave above and below the zero point is called _____.
amplitude
The _____ is the person, company or agency responsible for planning and supervising the commissioning of a system.
commissioned authority
Use a _____ to mount monitors and controls used in a video production studio.
console
Sound, in its most basic form, is _____.
vibrations
The grounded electrode system includes the grounded electrode conductor, the grounding electrode and the _____.
ground
The only difference between a monochrome image and a black and white image is that the black and white image contains _____.
shades of gray
The telephone (USOC) connector that was designed to allow alarm systems to automatically interrupt an existing telephone connection, seize that telephone line, and then automatically dial emergency services is the _____.
RJ-31X jack
When two or more persons or vehicles pass through an entry point with only one authorized entrant, it is referred to as _____.
tailgating or piggybacking
Entry control systems are usually powered by _____.
12VDC or 24VDC
If your home theater has risers, it is very important to make sure the steps are visible with _____ protect your guests from stumbling in the dark to
safety lighting
One common element of all microphones is the _____, which reacts to sound pressure by producing vibrations.
diaphragm
The term bonding involves connecting all noncurrent carrying metal parts of the electrical system and equipment to _____.
grounding system
Which of the following video formats uses a compressed format?
Windows Media Video
A frequency of 10 million hertz would be expressed as _____.
10 megahertz (MHz)
A charge-coupled device (CCD) chip contains imaging elements called _____.
photosites or pixels
In a Home Theater, the paint should not be a gloss or eggshell finish, but a _____ or _____ finish.
matte or flat
Surge protection devices limit peak surge voltages and _____ to ground.
redirect or divert
The most common microphone pickup pattern is the _____.
cardioid microphone
While a local area network (LAN) is the physical grouping of network devices, a _____ is a logical grouping of network devices.
VLAN
A piezoelectric speaker is most likely used for ______ applications.
low power
A wireless network can be established by use of wireless access point transceivers using the specifications of _____.
IEEE 802.11
Any home theater with more than one row of seating is going to need a(n) _____ so the heads of the people on the front row are not blocking the view for the seats behind them.
riser
Training is designed to transfer _____ to the trainee.
knowledge
Use a(n) _____ to block higher frequency noise from affecting sensitive electronic equipment.
EMI filter
A woofer speaker operates in the _____ frequency range.
low frequency
A high-security camera enclosure is likely to be found on a camera installed in a _____.
prison/bank
System controllers are basically a _____ with an operating system that allows programming.
computer
The DTV standard specifies the requirements for _____ of digital television signals.
transmission, format, and compression
The highest frequency band in the broadcast television frequency spectrum is the _____ band.
Ultra-High Frequency band
The purpose of a home theater is to provide a(n) _____ viewing and listening experience.
immersive
A _____ is a specialized loudspeaker that reproduces the extreme low frequencies present in movies or music.
subwoofer
All of the following are recognition methods used by biometric readers except _____.
DNA
From the client’s viewpoint, the _____ is the system.
user interface
The compression technology used for DVDs is _____.
MPEG-2
The term PTZ for a video camera refers to its ability to _____ the image.
pan, tilt, and zoom
Which of the following speaker types operate in the high range of frequencies?
tweeter
A _____ -pass filter attenuates (reduces the force of) frequencies on either side of a designated band of frequencies.
band-pass filter
Audio systems are often integrated with _____ for voice notifications.
Fire alarm systems
In the identification term “1080P,” the number 1080 specifies the number of lines of vertical resolution. The letter “P” refers to _____.
progressive scan
This type of biometric reader often uses ultrasonic imaging techniques to obtain a visual image for comparison.
fingerprint reader
Which of the following materials would be a good choice to shield against radio frequency interference?
copper
Most failures of electrical equipment are due to:
overheating
Outlet height should always be:
12 to 18 inches above the floor level
The connector which is universally used to terminate coaxial cable for television signal distribution (antenna, cable, satellite) in the home is the _____ connector
F-type
The highest bandwidth and throughput is found in _____.
fiber optic networks
The one document that contains all critical information about the prewire (cables, locations, rough-in devices, etc.) is the:
prewire diagram
The one document that contains all critical information about the prewire (cables, locations, rough-in devices, etc.) is the:
prewire diagram
Using BNC connectors for video applications is not always appropriate. Historically, BNC connectors were used with _____ cables causing an impedance mismatch with video connectors.
50-ohm
Never break off the _____ prong on a three-prong plug.
grounding
