3D151 Vol 2
- 1.
The process of condensation occurs when air particles are:
- A.
Pressurized, causing them to move closer together
- B.
Heated rapidly causing them to spread farther apart
- C.
Heated rapidly causing them to move closer together
- D.
Pressurized, causing them to be released to the atmosphere
Correct Answer
A. Pressurized, causing them to move closer together -
- 2.
In hertz (Hz), what range of sound can the human ear detect?
- A.
200 to 3,000
- B.
20 to 20,000
- C.
20 to 200,000
- D.
Up to 2,600
Correct Answer
B. 20 to 20,000 -
- 3.
The loudness of a sound is closely related to what part of the sine wave?
- A.
Amplitude
- B.
Frequency
- C.
Tone
- D.
Pitch
Correct Answer
A. Amplitude -
- 4.
Noise may be introduced into speech signals by thermal agitation and:
- A.
Power variations
- B.
Amplitude variations
- C.
Black body raditation
- D.
Molecular breakdown
Correct Answer
C. Black body raditation -
- 5.
In hertz (Hz), what is the actual voice frequency band?
- A.
300 to 1,600
- B.
300 to 2,600
- C.
300 to 3,400
- D.
300 to 3,800
Correct Answer
C. 300 to 3,400 -
- 6.
Which models of end offices in the Digital Multiplex System (DMS) family are commonly used at Air Force bases to provide base telephone services?
- A.
DMS-100 and Meridian System Logic (MSL)-100
- B.
DMS-100/200 and MSL-100
- C.
DMS-100/200 and DMS-200
- D.
DMS-200 and MSL-100
Correct Answer
A. DMS-100 and Meridian System Logic (MSL)-100 -
- 7.
Which model of Digital Multiplex System (DMS)-100 family switches is installed in compact modular cabinets?
- A.
System load (SL)-1
- B.
DMS-100
- C.
DMS-200
- D.
Meridian System Logic (MSL)-100
Correct Answer
D. Meridian System Logic (MSL)-100 -
- 8.
What is the maximum number of ports that a Meridian System Logic (MSL)-100 will support?
- A.
10,000
- B.
30,000
- C.
100,000
- D.
300,000
Correct Answer
B. 30,000 -
- 9.
Which type link is normally used to interconnect two peripheral modules (PM) in the Digital Multiplex System (DMS)?
- A.
Digital signal (DS)-1
- B.
DS-30A
- C.
DS-32
- D.
T1A
Correct Answer
B. DS-30A -
- 10.
What major area is connected to the central side (C-side) of a network module (NM) in the Digital Multiplex System (DMS)?
- A.
Control node (CN)
- B.
Peripheral module (PM)
- C.
Message controller (MC)
- D.
Central control
Correct Answer
D. Central control -
- 11.
What is the mounting bracket called on which transmission or swtiching equipment is mounted in a Digital Multiplex System (DMS)?
- A.
Bay
- B.
Card
- C.
Shelf
- D.
Frame
Correct Answer
A. Bay -
- 12.
What contains bays of the same functional equipment?
- A.
Bay
- B.
Card
- C.
Shelf
- D.
Frame
Correct Answer
D. Frame -
- 13.
Which Digital Multiplex System (DMS) component uses 16-bit Motorola 68000 or 8-bit Intel microprocessors?
- A.
A device controller
- B.
The network message controller
- C.
A peripheral module's (PM) peripheral processor (PP)
- D.
The computing module's (CM) central processing unit (CPU)
Correct Answer
C. A peripheral module's (PM) peripheral processor (PP) -
- 14.
How many channels of data does each digital signal (DS) 30 speech link carry?
- A.
30
- B.
32
- C.
34
- D.
36
Correct Answer
B. 32 -
- 15.
Up to how many duplicated digital signals (DS)-30 links are used to connect a line group controller (LGC) to the network module (NM)?
- A.
6
- B.
8
- C.
16
- D.
24
Correct Answer
C. 16 -
- 16.
What type of digital signal (DS) links are used to connect the Digital Multiplex System (DMS)-Core and the DMS-Bus?
- A.
1
- B.
30
- C.
30A
- D.
512
Correct Answer
D. 512 -
- 17.
How many inter-message switch links (IMSL) can be configured in a SuperNode?
- A.
2
- B.
4
- C.
8
- D.
16
Correct Answer
A. 2 -
- 18.
Where are the system clocks located within the SuperNode?
- A.
Network module (NM)
- B.
Peripheral module (PM)
- C.
Digital Multiplex System (DMS)-Bus
- D.
DMS-Core
Correct Answer
C. Digital Multiplex System (DMS)-Bus -
- 19.
What type of digital signal (DS) protocol is used as a message carrier between the Digital Multiplex System (DMS)-Bus and the network modules (NM) and input/output controller (IOC)?
- A.
1
- B.
3
- C.
30
- D.
512
Correct Answer
C. 30 -
- 20.
Where are the DMS-Core and DMS-Bus housed?
- A.
Line trunk controller (LTC)
- B.
Dual plane combined core (DPCC)
- C.
Multipoint controller (MC)
- D.
Multipoint control unit (MCU)
Correct Answer
B. Dual plane combined core (DPCC) -
- 21.
What is the first step in the pulse code modulation (PCM) process?
- A.
Discrete amplitudes are assigned to the sampling pulses
- B.
A binary code number is assigned to the sample
- C.
The quantizer limits the amplitude of the pulses
- D.
The analog signal is band-limited
Correct Answer
D. The analog signal is band-limited -
- 22.
In the pulse code modulation (PCM) process, changing the quantized samples into a binary word is called:
- A.
Encoding
- B.
Sampling
- C.
Quantization
- D.
Band limiting
Correct Answer
A. Encoding -
- 23.
What is a method of putting many users on a single cable pair?
- A.
Time code multiplexing
- B.
Pulse code modulation
- C.
Pulse amplitude modulation
- D.
Time division multiplexing
Correct Answer
D. Time division multiplexing -
- 24.
In the time division multiplexing (TDM) process, the rate of sampling must be equal to:
- A.
The lowest frequency sampled multiplied by the sampling rate per cycle
- B.
The highest frequency sampled multiplied by the sampling rate per cycle
- C.
Twice the lowest frequency sampled multiplied by the sampling rate per cycle
- D.
Twice the highest frequency sampled multiplied by the sampling rate per cycle
Correct Answer
B. The highest frequency sampled multiplied by the sampling rate per cycle -
- 25.
Each 125 microsecond time period in the digital signal (DS) 30 signaling format (used within the voice network system) is called a:
- A.
Span
- B.
Frame
- C.
Channel
- D.
Snapshot
Correct Answer
B. Frame -
- 26.
Integrated Services Digital Network (ISDN) can combine voice and data services over the same wires because it uses
- A.
Internet data lines
- B.
Digital subscriber lines
- C.
Direct connection lines
- D.
Standard telephone lines
Correct Answer
D. Standard telephone lines -
- 27.
What type of information is transmitted on an Integrated Services Digital Network (ISDN) B-channel?
- A.
Call control
- B.
Supervisory
- C.
Signaling
- D.
User (voice or data)
Correct Answer
D. User (voice or data) -
- 28.
What are the two major established Integrated Services Digital Network (ISDN) transmission rates?
- A.
Bearer rate interface and data rate interface
- B.
Basic rate interface and primary rate interface
- C.
Basic rate interface and secondary rate interface
- D.
Primary rate interface and secondary rate interface
Correct Answer
B. Basic rate interface and primary rate interface -
- 29.
What is the Integrated Services Digital Network (ISDN) R-interface?
- A.
Connection point between a non-ISDN compatible device and a terminal adapter (TA)
- B.
Connection point between a network termination 1 device and the ISDN
- C.
Incoming connection point of a network termination 2 device
- D.
Outgoing connection point of a network termination 2 device
Correct Answer
A. Connection point between a non-ISDN compatible device and a terminal adapter (TA) -
- 30.
The Network Layer of the Open Systems Interconnection (OSI) model provides the:
- A.
Physical characteristics between the Integrated Services Digital Network (ISDN) interface and the network
- B.
Logical links between customer equipment and the circuit switch
- C.
Final preparation of the signal before it is routed
- D.
Actual routing of the signal
Correct Answer
D. Actual routing of the signal -
- 31.
What circuit board in the REDCOM switch provides two signaling channels and is only necessary when interfacing with an Integrated Services Digital Network (ISDN)-capable switch?
- A.
T1 legacy to Internet
- B.
Message transceiver interface
- C.
T1 direct digital interface
- D.
Basic rate U
Correct Answer
B. Message transceiver interface -
- 32.
One of the main purposes of the Integrated Services Digital Network (ISDN) handset telephone test set is to:
- A.
Detect noise
- B.
Insert tones
- C.
Verify a dial tone
- D.
Insert signal delay
Correct Answer
C. Verify a dial tone -
- 33.
What is the frame rate in feet per second (FPS) for transmitting video teleconferencing data on the Integrated Services Digital Network (ISDN)?
- A.
24
- B.
30
- C.
32
- D.
64
Correct Answer
B. 30 -
- 34.
What component in the video teleconferencing (VTC) system converts analog signals to digital signals?
- A.
Camera
- B.
Coder/decoder (CODEC)
- C.
Network termination 1
- D.
Central processing unit (CPU)
Correct Answer
B. Coder/decoder (CODEC) -
- 35.
How many channels are used when a voice over Internet Protocol (VoIP) session is established between a private branch exhange (PBX) and another IP host?
- A.
One, they share the same channel
- B.
Two, one for each direction
- C.
Three, two to transmit/receive and one to signal
- D.
Four, two to transmit and two to receive
Correct Answer
B. Two, one for each direction -
- 36.
What component of voice over Internet Protocol (VoIP) is an endpoint on the network that provides real time, bi-directional communications between H.323 terminals and other switch circuit networks (SCN)?
- A.
Gateway
- B.
Gatekeeper
- C.
Terminal adapter
- D.
Multipoint control unit (MCU)
Correct Answer
A. Gateway -
- 37.
What component of voice over Internet Protocol (VoIP) provides call management functions in a defined local area called a zone?
- A.
Gateway
- B.
Gatekeeper
- C.
Terminal adapter
- D.
Multipoint control unit (MCU)
Correct Answer
B. Gatekeeper -
- 38.
How many milliseconds should the one-way delay be from endpoint to endpoint in order to implement voice over Internet Protocol (VoIP)?
- A.
Less than 50
- B.
Less than 150
- C.
Greater than 50
- D.
Greater than 150
Correct Answer
B. Less than 150 -
- 39.
What is the control system that generates a signal with a fixed relation to the phase of a reference signal and responds to both the frequency and the phase of the input signals?
- A.
Quality of service (QoS)
- B.
Remote control protocol (RCP)
- C.
Forward error correction (FEC)
- D.
Phase-locked loop (PLL)
Correct Answer
D. Phase-locked loop (PLL) -
- 40.
What are frequencies from 30 to 300 megahertz (MHz) internationally designated as?
- A.
High
- B.
Medium
- C.
Very high
- D.
Ultra high
Correct Answer
C. Very high -
- 41.
The ultra high frequency designation applies to frequencies from:
- A.
3 to 30 megahertz (MHz)
- B.
300 to 3,000 MHz
- C.
3 to 30 gigahertz (GHz)
- D.
30 to 300 GHz
Correct Answer
B. 300 to 3,000 MHz -
- 42.
Which of the following frequencies has the shortest wavelength?
- A.
14 kilohertz (kHz)
- B.
1.4 megahertz (MHz)
- C.
14 MHz
- D.
140 MHz
Correct Answer
D. 140 MHz -
- 43.
A mode of operation in which communication is possible between two or more stations, in both directions, using the same frequency, is called:
- A.
Simplex
- B.
Duplex
- C.
Hybrid
- D.
Half-duplex
Correct Answer
A. Simplex -
- 44.
What communication mode(s) of operation allows two or more stations to send intelligence in both directions but not simultaneously?
- A.
Duplex only
- B.
Half duplex only
- C.
Duplex and half duplex
- D.
Simplex and half duplex
Correct Answer
B. Half duplex only -
- 45.
Producing radio frequency (RF) energy and radiating useful signals into space is the purpose of:
- A.
Reciever
- B.
Transmitter
- C.
Antenna coupler
- D.
Transmission lines
Correct Answer
B. Transmitter -
- 46.
What type modulation produces a constant amplitude transmission?
- A.
Frequency
- B.
Amplitude
- C.
Phased
- D.
Pulse
Correct Answer
B. Amplitude -
- 47.
The ability to maintain a constant output carrier frequency refers to a transmitter's frequency:
- A.
Accuracy
- B.
Distortion
- C.
Sensitivity
- D.
Signal-to-noise ratio
Correct Answer
A. Accuracy -
- 48.
The process of mixing or combining two frequencies in a nonlinear device in an amplitude modulated (AM) receiver is called:
- A.
Limiting
- B.
Amplifying
- C.
Heterodyning
- D.
Discriminating
Correct Answer
C. Heterodyning -
- 49.
What component of a frequency modulated (FM) receiver removes the original signal from the sidebands and recreates the audio intelligence?
- A.
Limiter
- B.
Detector
- C.
Amplifier
- D.
Discriminator
Correct Answer
D. Discriminator -
- 50.
What characteristic enables a receiver to reproduce a desired signal from several closely spaced stations or from interfering frequencies?
- A.
Sensitivity
- B.
Selectivity
- C.
Fade margin
- D.
Thermal noise
Correct Answer
B. Selectivity -
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Current Version
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Mar 18, 2022Quiz Edited by
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Aug 02, 2012Quiz Created by
Miccur33
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