EEST 111
Some equalizers allow you to sweep frequency bands. This means you
Move equalization into higher or lower frequencies
RFI and EMI problems are often dealt with by
Isolation
The directionality of a microphone determines its sensitivity to sounds coming from different
Angles
A type of filter that passes all frequencies except those in a limited range is
Band rejection filter
... is a term used in antenna specifications to describe the width of an antenna ' s main lobe at the points where the voltage is .707 times the maximum voltage
Beam width
In HDMI, horizontal and vertical sync are included in the
Blue channel
What properties of a video signal do hue and saturation describe?
Color and amount of gray
When an array of speakers lacks a uniform response it results in
Comb filtering
Clipping means the transient highs of a waveform are cut off, creating
Deviation
In order to operate, a condenser microphone requires
Electrical current
A microphone converts sound to
Electrical energy
Inputs to an audio system are first converted to
Electrical signals
The preferred connector for connecting satellite video to the set-top box is
F- type compression
Computer displays experience a noticeable flashing of the picture called
Flicker
Loudspeakers intended for suspension are said to be designed for
Flying
A bandpass filter attenuates
Frequencies on either side of a designated band
The ratio between the power of an input signal and the output signal is known as
Gain
A 1,000,000,000 Hz signal can also be expressed as
Gigahertz (1GHz)
The type of cable that carries both video and audio is
HDMI
Transformers with multiple sets of leads for connecting speakers at different wattages are known as
Line matching transformers
What compression method is used for the compression of DTV
MPEG
In what type of circuit are the source and the load impedances equal
Matched
The item labeled as 9 in the figure above is a
Modulator
The loudness of sound is stated in terms of
Sound pressure level
The instrument used to measure frequency response relative to a room is a
Spectrum analyzer
Video signals carry 3 types of information :brightness, color, and
Synchronization
The power supply that provides the for a CATV distribution system line amplifier is
The power supply distribution
The load impedance of a bridged circuit is how many times that of the source?
10
Which of the following coaxial cables has the least attenuation per 100' regardless of frequency
0.5 or1/2 inch cable
The primary frequencies produced by the human voice are in the range of
100 to 400 Hz
The frequency range of the down link signals transmitted by a DBS satellite is
12.2 to 12.7GHz
Speaker systems for speech reinforcement are optimized in the range of
200 to 8000 Hz
In the figure above, the tap value for the last tap needed to deliver a minimum of 6dBmv to a subscriber is
20dB
In the figure above, the tap value for the third tap needed to deliver a minimum of 6dBmv to a subscriber is
22dB
The peak program meter (PPM) typically has a total meter range of
24 to 26 dB
A speaker with built-in amplifier is used in a
24V paging system
The signal level for channel 2 at the input to the last tap in the figure above is
29.5dB
For how long does a VU meter sample incoming sound to produce an average volume level for a signal
300 milliseconds
The signal level for channel 2 at the input to the second tap in the figure above is
35.5dB
Which component shown in the figure above function to electronically amplify and improve the signal - to- noise ratio of a received VHF or UHF signal
5 (amplifier )
TV channels formatted in the HDTV format have
6MHz bandwidth
The nominal insertion loss of a four-way splitter that is being used as a combiner is
7 dB
Which component shown in the figure above produces audio and video baseband outputs?
8 (satellite receivers )
The frequency range of the signals applied to the input of a satellite receiver typically is
900 to 1450 MHz
In sound system, feedback is a
Acoustical problem
The RGB colors in the RGB color space are considered
Additive colors
The type of head end processor that provides the most flexibility for channel output is a
Agile heterodyne processor
A test instruments used to determine insertion loss and cable loss at a preset frequency is called
An impedance bridge
Of the following, which type requires 3 cables to carry the video signal
Component
The DVI standard applies to HDTV and
Computer displays
A balancing amplifier is used to
Connect an unbalanced line to a balanced connection
The type of distortion generated in a distribution amplifier that can cause a buzzing in the TV sound and sound lines in the picture is
Cross modulation
The most common form of distortion from an amplifier is
Harmonic distortion
A microphone cable should
Have a high strand count
The vertical sync signal is based on the width of the
Horizontal sync
Each line of a video field contains a
Horizontal sync signal
When noise levels are extremely high, paging system use
Horns
In an audio system, the term constant - voltage describes the distribution of
Power
For audio applications, an amplifier increases the
Power of the signal
A plasma video panel is considered a
Presentation device
The item labeled as 3 in the figure above is a
Processor
Response time for an LCD relates to what rate of an LCD display ?
Refreshing
National networks and movie channels such as CNN and HBO are received by a CATV head end via
Satellite antenna
3 characteristics that determine the resolution of a display device are
Scan lines, number of pixels, and bits per color
The topology of a distribution system used by a regional cable company to distribute CATV signal to its subscribers is called
Trunk branch system
In the frequency spectrum allocated for broadcast TV, the sequence of the frequency bands moving from the higher frequencies to lower frequencies is
UHF, High VHF, band pass
Cables with a single conductor and shield are
Unbalanced line
In an HDMI connector, pins 1-9 carry
Video and audio
Viewing angle refers to what properties of a displayed image based on viewer position relative to the display?
Visibility and clarity
If a length of coaxial cable has an input signal of 400 microV and an output signal level of 100 microV, what is the attenuation loss of the cable?
dB lost= 12dB
If an amplifier has an input signal level of 200mW and an output signal level of 1000mW, what is the gain of the amplifier?
dB= 10×log p1/p2= 7dB