# 2e153 Practice Test, Set II

91 Questions | Total Attempts: 97

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Questions throughout the three volumes in the second set specifically for Ground Radio. (I'm in the middle of creating this quiz, there are still more questions to be written)

• 1.
Volume 1- Unit 1 For successful communications to take place, the transmitter's carrier output must be...
• A.

Relatively rich in harmonics

• B.

Transmitted in a specific direction

• C.

Relatively stable in frequency and amplitude

• D.

Attentuated to prevent overdriving the receiver input

• 2.
Volume 1- Unit 1 For modulation to take place, what must be present?
• A.

Filtering, heterodyning, nonlinearity, and amplification

• B.

A reference signal, an RF carrier, a modulating signal, and nonlinearity

• C.

Filtering, an RF carrier, a modulating signal, and nonlinearity

• D.

A reference signal, a modulating signal, nonlinearity, and filtering

• 3.
Volume 1- Unit 1 Which statement concerning bandwidth is true?
• A.

Overmodulating increases bandwidth due to the production of harmonics

• B.

Undermodulating increases bandwidth due to the production of harmonics

• C.

Overmodulating increases bandwidth due to the output's increased amplitude

• D.

Undermodulating increases bandwidth due to the output's decreased amplitude

• 4.
Volume 1- Unit 1 Reducing modulation to less than 100% gives...
• A.

More total power

• B.

A reduction in carrier power

• C.

No reduction in carrier power

• D.

A reduction in carrier and sideband power

• 5.
Volume 1- Unit 1 Which statement is true concerning receiver operation?
• A.

In order to change the operating frequency, we must change the IF only.

• B.

When we change frequencies, the IF does not change, the local oscillator frequency does.

• C.

Changing the local oscillator frequency has no effect on our operating frequency.

• D.

When we change frequencies, the IF changes by an amount equal to the change in the local oscillator frequency.

• 6.
Volume 1- Unit 1 Which section of the receiver determines overall selectivity?
• A.

IF filter

• B.

Tunable filter

• C.

Audio detector

• D.

Power supply

• 7.
Volume 1- Unit 1 With an operating frequency of 150 MHz and an IF of 10.7 MHz, which option is a possible image frequency?
• A.

171.4 KHz

• B.

140.7 MHz

• C.

171.4 MHz

• D.

160.14 MHz

• 8.
Volume 1- Unit 1 In an AM receiver's detector circuit, a nonlinear device is necessary to...
• A.

Supply the desired sensitivity of the input circuitry

• B.

Ensure only the proper IF signal is amplified

• C.

Filter out any extraneous signals

• D.

Cause heterodyning

• 9.
Volume 1- Unit 1 What are the basic requirements for any type of heterodyning?
• A.

Sensitivity and nonlinearity

• B.

Sensitivity, nonlinearity, RF carrier signal, and filtering

• C.

Selectivity, nonlinearity, RF carrier signal, and filtering

• D.

Sensitivity, nonlinearity, RF carrier signal, filtering, and conversion

• 10.
Volume 1- Unit 1 Which statement is true concerning diode detectors?
• 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 power gain

• 11.
Volume 1- Unit 1 What is the output power of the AN/GRC-171B(V)4 transceiver?
• A.

25 Watts in both AM and FM

• B.

20 Watts in AM, 50 Watts in FM

• C.

20 Watts in AM, 25 Watts in FM

• D.

50 Watts in narrowband, 25 Watts in wideband

• 12.
Volume 1- Unit 1 During transmit operation, what is the purpose of the compressor circuit in the RT-1446 HF Transceiver?
• A.

Equalize varying voice levels so the audio signal is more uniform in amplitude

• B.

Amplify the microphone audio level to ensure it is of adequate amplitude

• C.

Provides a tune-select signal to the antenna coupler

• D.

Provides heterodyning of the audio and RF carrier

• 13.
Volume 1- Unit 1 What two properties of a transmission line determine its characteristic impedance?
• A.

Inductance and resistance

• B.

Inductance and capacitance

• C.

Resistance and capacitance

• D.

Length and type of shielding

• 14.
Volume 1- Unit 1 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 line

• D.

Wavelength is expressed in lambdas

• 15.
Volume 1- Unit 1 A non resonant transmission line is a line...
• A.

Having reflected waves

• B.

Having no reflected waves

• C.

With a maximum voltage across its open termination

• D.

With a maximum voltage across its shorted termination

• 16.
Volume 1- Unit 1 If a transmission line is terminated in a short...
• A.

Current is at a maximum and voltage at minimum at the termination

• B.

Current is at a minimum and voltage maximum at the termination

• C.

There would be a nominal amount of signal gain

• D.

The line would be nonresonant

• 17.
Volume 1- Unit 1 The ability of an antenna to receive as well as transmit effectively is called
• A.

Fidelity

• B.

Capacity

• C.

Reciprocity

• D.

Transquality

• 18.
Volume 1- Unit 2 Nonsynchronous orbit satellites are in an orbit which is...
• A.

Circular

• B.

Elliptical

• C.

Hyperbolic

• D.

Parabolic

• 19.
Polar orbit has an inclination of...
• A.

45 degrees

• B.

60 degrees

• C.

80 degrees

• D.

90 degrees

• 20.
Volume 1- Unit 2 What are two types of communication satellites?
• A.

Active and Passive

• B.

Active and Real-time

• C.

Delay and Passive

• D.

Delay and Real-time

• 21.
Volume 1- Unit 2 What is the delay of a real-time Satellite?
• A.

0.1 seconds

• B.

0.6 seconds

• C.

1.0 seconds

• D.

1.6 seconds

• 22.
Volume 1- Unit 2 In a Demand Assigned Multiple Access (DAMA) system, which of the following functions as the network control station (NCS)?
• A.

Only a network management system (NMS) outside of the satellite's footprint

• B.

The central network control station (CNCS) at Andrews AFB, MD

• C.

Any remote unit processing the appropriate hardware and software

• D.

The network control element (NCE) at Andrews AFB, MD

• 23.
Volume 1- Unit 2 How many subscribers can a single transponder support by using a Demand Assigned Multiple Access (DAMA) system?
• A.

A maximum of 100

• B.

A maximum of 600

• C.

Roughly 3000

• D.

Several thousand

• 24.
Volume 1- Unit 2 What are the primary missions of the Global Positioning System (GPS)?
• A.

• B.

• C.

• D.

Position and timing transfer

• 25.
Volume 1- Unit 3 What is the maximum raw data rate for the 802.11b standard?
• A.

6 Mbit/s

• B.

11Mbit/s

• C.

25Mbit/s

• D.

54Mbit/s

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