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ITC Exam 2021 > NAVEDTRA 14088 Volume 3 Chapter 2 > Flashcards

NAVEDTRA 14088 Volume 3 Chapter 2 Flashcards

1
Q

When you use subdivisions to assign reference designators to equipment, what is the designator of the (a) largest subdivision and (b) smallest subdivision?

A

System part

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2
Q

Extremely-low-frequency transmission is primarily directed at which of the following users?

A

Submarines

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3
Q

The very-low-frequency receive system is designed to receive what types of signals?

A

FSK and ICW

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4
Q

The AN/FRT-72 (if) transmitter is used to provide (a) how many channels of frequency-division multiplex rtty traffic over (b) what type of fleet broadcast system at (c) what type of power?

A

(a) Eight (b) multichannel (c) high

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5
Q

HF communications from shore- based transmitters to ships at sea using frequency and space diversity is an example of which of the following types of systems?

A

Fleet broadcast

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6
Q

Which one of the following equipment would you use to match a transmitter’s output impedance to an antenna’s input impedance?

A

AN/URA-38

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7
Q

The AN/VRC-80 is not just a vhf transmitter or receiver. What is the name given to a piece of equipment that performs both functions?

A

Transceiver

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8
Q

During UHF secure voice transmission, the operator uses a secure voice remote phone unit. What is the common term for this unit?

A

RPU

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9
Q

Which of the following combinations of radio-relay systems provides (a) one-way communications and (b) two-way communications?

A

Simplex duplex

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10
Q

What term is normally used for microwave transmitter input signal?

A

Baseband signal

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11
Q

In a microwave transmitter, the linearize couples a portion of the output power back to the klystron. This allows for modulation densities as high as 1200 channels and compensates for what klystron deficiency?

A

Non-linearity

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12
Q

In a typical microwave receiver, what is the standard intermediate frequency?

A

70 MHz

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13
Q

Which of the following methods are usually used for microwave communications?

A

LOS and troposcatter

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14
Q

By which of the following methods can you increase the maximum number of intelligible signals transmitted on a single path?

A

Multiplexing

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15
Q

Which of the following communications methods involves subdividing a channel into smaller segments of equal size and placing a signal in each subchannel?

A

FDM

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16
Q

What requirements does SAS satisfy?

A

Nonsecure voice communications, secure voice communications, and voice signal switching

17
Q

How many crypto and plain subsystems are used within SAS?

A

Five

18
Q

One mode of teletypewriter operation is the synchronous mode. What other mode is used for basic teletypewriter operation?

A

Asynchronous

19
Q

What is the name of the five-unit code that includes mark and space signals and is used in teletypewriter operation?

A

Baudot

20
Q

Which of the following problems is reduced by not using start and stop signals in the synchronous teletypewriter mode?

A

Distorted signal

21
Q

Which of the following terms accually pertains only to modulation rate?

A

Baud

22
Q

In neutral tty operation, current flow and no current flow represent the mark and space conditions. In polar tty operation what is the condition of the line current?

A

It is always present

23
Q

What device is used to change tty dc pulses into mark and space signals to modulate the transmitter carrier wave?

A

Keyer

24
Q

After the tty signal is received, what device(s) must be used to change the signal back to dc pulses?

A

Converter and receiver

25
Q

The Navy’s two basic RATT systems are AFTS and RFCS. What is the RFCS system commonly called?

A

FSK

26
Q

What device provides looping current for the tty?

A

A solid state power supply

27
Q

What is/are used to interconnect all the tty equipment in any configuration needed?

A

TTY panel

28
Q

Which of the following methods is/are used to reduce fading and interference in long-range communications?

A

Frequency and space diversity

29
Q

What type of frequency diversity is used for multichannel broadcasts?

A

Tone

30
Q

During unpatching, pulling which plug from its tty panel jack first will produce a dangerous dc voltage on the exposed plug?

A

Set

31
Q

How many rotary switch positions will you find on a remote transmitter control unit?

A

Three

32
Q

In AFTS, to what does the term “half-duplex” refer?

A

Send only, receive only, send or receive

ITC Exam 2021 (36 decks)

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