2e153 Ground Radio Communications Journeyman Practice Test
This is a practice test for the 2E153 Ground Radio Communications Journeyman Career Development Course. Questions are pulled from various portions of each of the volumes.
- 1.Volume 1, Section 001.For Successful communications to take place, the carrier output must be:
- A.
Relatively rich in harmonics.
- B.
Transmitted in a specific direction.
- C.
Relatively stable in frequency and modulation.
- D.
Attenuated to prevent overdriving the frequency input.
- 2.Volume 1, Section 002.With overmodulation, the bandwidth of an Amplitude Modulated Signal will be:
- A.
Decreased considerably due to the severe distortion produced.
- B.
Increased considerably due to the severe distortion produced.
- C.
Decreased considerably due to superheterodyning in the Local Oscillator.
- D.
Increased considerably due to superheterodyning the the Local Oscillator.
- 3.Volume 1, Section 003.With an operating frequency of 150 MHz and an IF of 10.7 MHz, which option is a possible image frequency?
- A.
21.4 MHz.
- B.
140.7 MHz.
- C.
160.14 MHz
- D.
171.4 MHz.
- 4.Volume 1, Section 004.What statement concerning diode detectors is true?
- A.
They are relatively complex devices.
- B.
They can only handle relatively small signals.
- C.
They give high fidelity detection for signals of sufficient amplitude.
- D.
They are relatively simple devices and provide a tremendous amount of gain.
- 5.Volume 1, Section 005.In the AN/ GRC-171B(V)4, what blanks Pulse-type noise (often radar) from the audio output during AM receive?
- A.
Noise Channel Blanking Circuit.
- B.
AM/FM NB Amplifier.
- C.
Phase Locked loop frequency synthesizer.
- D.
Voltage regulator Circuit.
- 6.Volume 1, Section 006.During transmit operation, what is the purpose of the compressor circuit in the RT-1446 HF Transceiver?
- A.
Amplify the microphone audio level to ensure it is of adequate amplitude.
- B.
Provides a tune-select signal to the antenna coupler.
- C.
Provides heterodyning of the audio and RF carrier.
- D.
Equalize varying voice levels to the audio signal is more uniform in amplitude.
- 7.Volume 1, Section 007.Which statement concerning wavelength is true?
- A.
Wavelength is inversely related to frequency.
- B.
Wavelength is directly related to frequency.
- C.
Wavelength is determined by length of the line.
- D.
Wavelength is expressed in lambdas.
- 8.Volume 1, Section 008.If a transmission line is terminated in a short,
- A.
There would be a nominal amount of signal gain.
- B.
The line would be resonant.
- C.
Current is at a maximum and voltage at minimum at the termination.
- D.
Current is at a minimum and voltage at maximum at the termination.
- 9.Volume 1, Section 009.In Transverse Magnetic (TM) mode of propagation,
- A.
RG-213 Cable is best for transmission means.
- B.
RG-58 Cable is best for transmission means.
- C.
The electric field is transverse to the direction of propagation.
- D.
The magnetic field is transverse to the direction of propagation.
- 10.Volume 1, Section 010.When two or more signals of the same frequency arrive at the receiver simultaneously, the resultant interference is termed
- A.
Skip interference.
- B.
Multi-path interference.
- C.
Phase interference.
- D.
Harmonic interference.
- 11.Volume 1, Section 011.Using the AN/ GRA-4 Antenna Group, which antenna is best used for operating frequencies not less than 4.5 MHz due to excessive antenna length at lower frequencies, is highly directional, and cannot be used very successfully for communication with multiple stations?
- A.
L-Type antenna
- B.
Off-center-fed Hertz antenna
- C.
Slanting Wire antenna
- D.
Center-fed Hertz antenna
- 12.Volume 1, Section 012.A polar orbit has an inclination of:
- A.
0 Degrees
- B.
45 Degrees
- C.
60 Degrees
- D.
90 Degrees
- 13.Volume 1, Section 013.What are the two types of communications satellites?
- A.
Active and Passive.
- B.
Active and Real Time.
- C.
Delay and Passive.
- D.
Delay and Real Time.
- 14.Volume 1, Section 014.In DAMA Communictions, the Network control System (NCS):
- A.
Realigns the satellite orbit to accomidate for new users.
- B.
Establishes the channel betwen the originating site and the distant end.
- C.
Can only be accessed by JSTARS systems.
- D.
Is routed through the DoD switch in Hawaii
- 15.Volume 1, Section 015.In the AN/ PSC-5 Spitfire, which module provides the primary operator interface for RT Status Control?
- A.
RF/IF Module.
- B.
Controller Module.
- C.
Comsec Module.
- D.
Transmitter Module.
- 16.Volume 1, Section 016.The AN/ PRC-117F provides a power output of:
- A.
10 Watts average is FM operations
- B.
10 Watts average in AM operations
- C.
30 Watts average in FM operations
- D.
30 Watts average in AM operations
- 17.Volume 1, Section 017.What are the primary missions of the Global Positioning System (GPS)?
- A.
Navigation and timing transfer.
- B.
Navigation and nuclear detection.
- C.
Position and nuclear detection.
- D.
Postion and timing transfer.
- 18.Volume 1, Section 018.How many routes can the AN/ PSN-11 Store?
- A.
15 routes with 25 legs per route.
- B.
15 routes with 20 legs per route.
- C.
20 routes with 25 legs per route.
- D.
20 routes with 20 legs per route.
- 19.Volume 1, Section 019.What satellite system was originally developed in 1979 for ship management, distress and safety applications?
- A.
Iridium
- B.
AFSATCOM
- C.
DSCS
- D.
INMARSAT
- 20.Volume 1, Section 020.Due to overlapping frequency ranges, how many wireless LANs can exist in any one area?
- A.
1 Network
- B.
2 Networks
- C.
3 Networks
- D.
4 Networks
- 21.Volume 1, Section 021.What is the net throughput of 802.11g Standard?
- A.
2 Mbit/s
- B.
11 Mbit/s
- C.
24.7 Mbit/s
- D.
54 Mbit/s
- 22.Volume 1, Section 022.Which Bluetooth power class is the most common?
- A.
Class 1
- B.
Class 2
- C.
Class 3
- D.
Class 4
- 23.Volume 1, Section 023.In conventional LMR Systems, this serves as a hub of a net
- A.
Portable
- B.
Mobile
- C.
Repeater
- D.
Base Station
- 24.Volume 1, Section 024.Which radio system is one that automatically and dynamically allocates a small number of radio channels to support a large number of users?
- A.
Trunked
- B.
Conventional
- C.
Repeater
- D.
Base Station
- 25.Volume 1, Section 025.Which cellular telephone technology uses "Spread Spectrum?"
- A.
AMPS
- B.
CDMA
- C.
GSM
- D.
TDMA
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