Fcc Grol Element 3L

Front 1

3-74L1

What is a 1/2 digit on a DMM?

Back 1

Partial extended accuracy on lower part of the range

Front 2

3-74L2

A 50 microampere meter movement has an internal resistance of 2,000 ohms. What applied voltage is required to indicate half-scale deflection?

Back 2

0.05 volts

Front 3

3-74L3

What is the purpose of a series multiplier resistor used with a voltmeter?

Back 3

It is used to increase the voltage-indicating range of the voltmeter

Front 4

3-74L4

What is the purpose of a shunt resistor used with an ammeter?

Back 4

It is used to increase the ampere indicating range of the ammeter

Front 5

3-74L5

What instrument is used to indicate high and low digital voltage states?

Back 5

Logic probe

Front 6

3-74L6

What instrument may be used to verify proper radio antenna functioning?

Back 6

An SWR meter

Front 7

3-75L1

How is a frequency counter used?

Back 7

To measure the time between events, or the frequency, which is the reciprocal of the time

Front 8

3-75L2

What is a frequency standard?

Back 8

A device used to produce a highly accurate reference frequency

Front 9

3-75L3

What equipment may be useful to track down EMI aboard a ship or aircraft?

Back 9

Portable AM receiver

Front 10

3-75L4

On an analog wattmeter, what part of the scale is most accurate and how much does that accuracy extend to the rest of the reading scale?

Back 10

The accuracy is only at full scale, and that absolute number reading is carried through to the rest of the range. The upper 1/3 of the meter is the only truly calibrated part

Front 11

3-75L5

Which of the following frequency standards is used as a time base standard by field technicians?

Back 11

Rubidium Standard

Front 12

3-75L6

Which of the following contains a multirange AF voltmeter calibrated in dB and a sharp, internal 1000 Hz bandstop filter, both used in conjunction with each other to perform quieting tests?

Back 12

SINAD meter

Front 13

3-76L1

What is used to decrease circuit loading when using an oscilloscope?

Back 13

10:1 divider probe

Front 14

3-76L2

How does a spectrum analyzer differ from a conventional oscilloscope?

Back 14

The oscilloscope is used to display electrical signals in the time domain while the spectrum analyzer is used to display electrical signals in the frequency domain

Front 15

3-76L3

What stage determines the maximum frequency responce of an oscilloscope?

Back 15

Vertical amplifier

Front 16

3-76L4

What factors limit the accuracy, frequency response, and stability of an oscilloscope?

Back 16

Sweep oscillator quality and deflection amplifier bandwidth

Front 17

3-76L5

An oscilloscope can be used to accomplish all of the following except:

Back 17

Measure velocity of light with the aid of a light emitting diode.

Front 18

3-76L6

What instrument is used to check the signal quality of a single-sideband radio transmission?

Back 18

Oscilloscope

Front 19

3-77L1

A(n) ____ and ____ can be combined to measure the characteristics of transmission lines. Such an arrangement is known as a time-domain reflectometer (TDR).

Back 19

Oscilloscope, pulse generator

Front 20

3-77L2

What does the horizontal axis of a spectrum analyzer display?

Back 20

Frequency

Front 21

3-77L3

What does the vertical axis of a spectrum analyzer display?

Back 21

Amplitude

Front 22

3-77L4

What instrument is most accurate when checking antennas and transmission lines at the operating frequency of the antenna?

Back 22

Frequency domain reflectometer

Front 23

3-77L5

What test instrument can be used to display spurious signals in the output of a radio transmitter?

Back 23

A spectrum analyzer

Front 24

3-77L6

What instrument is commonly used by radio service technicians to monitor frequency, modulation, check receiver sensitivity, distortion, and to generate audio tones?

Back 24

Service monitor

Front 25

3-78L1

Can a P25 radio system be monitored with a scanner?

Back 25

Yes, if the scanner has P25 decoding

Front 26

3-78L2

Which of the following answers is true?

Back 26

The RF Power reading on a CDMA radio is not accurate on an analog power meter

Front 27

3-78L3

What is a common method used to program radios without using a “wired” connection?

Back 27

Infra-red communication

Front 28

3-78L4

What is the common method for determining the exact sensitivity specification of a receiver?

Back 28

Measure the recovered audio for 12 dB of SINAD

Front 29

3-78L5

A communications technician would perform a modulation-acceptance bandwidth test in order to:

Back 29

Determine the effective bandwidth of a communications receiver

Front 30

3-78L6

What is the maximum FM deviation for voice operation of a normal wideband channel on VHF and UHF?

Back 30

5.0 kHz

Front 31

3-79L1

When soldering or working with CMOS electronics products or equipment, a wrist strap:

Back 31

Must have less than 100,000 ohms of resistance to prevent static electricity

Front 32

3-79L2

Which of the following is the preferred method of cleaning solder from plated-through circuit-board holes?

Back 32

Use a vacuum device

Front 33

3-79L3

What is the proper way to cut plastic wire ties?

Back 33

With flush-cut diagonal pliers and cut flush

Front 34

3-79L4

The ideal method of removing insulation from wire is:

Back 34

The thermal stripper

Front 35

3-79L5

A “hot gas bonder” is used:

Back 35

For non-contact melting of solder

Front 36

3-79L6

When repairing circuit board assemblies it is most important to:

Back 36

Wear safety glasses

Front 37

3-80L1

What color is the binder for pairs 51-75 in a 100-pair cable?

Back 37

Green

Front 38

3-80L2

What is most important when routing cables in a mobile unit?

Back 38

Assuring radio or electronics cables do not interfere with the normal operation of the vehicle

Front 39

3-80L3

Why should you not use white or translucent plastic tie wraps on a radio tower?

Back 39

UV radiation from the Sun deteriorates the plastic very quickly

Front 40

3-80L4

What is the 6th pair color code in a 25 pair switchboard cable as is found in building telecommunications interconnections?

Back 40

Red/Blue, Blue/Red

Front 41

3-80L5

What tolerance off of plumb should a single base station radio rack be installed?

Back 41

Just inside the bubble on a level

Front 42

3-80L6

What type of wire would connect an SSB automatic tuner to an insulated backstay?

Back 42

GTO-15 high-voltage cable

Front 43

3-81L1

On a 150 watt marine SSB HF transceiver, what would be indicated by a steady output of 75 watts when keying the transmitter on?

Back 43

There is probably a defect in the system causing the carrier to be transmitted

Front 44

3-81L2

The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

Back 44

Add a .01 µF capacitor across the motor/tachometer leads

Front 45

3-81L3

A common method of programming portable or mobile radios is to use a:

Back 45

A laptop computer

Front 46

3-81L4

In a software-defined transceiver, what would be the best way for a technician to make a quick overall evaluation of the radio’s operational condition?

Back 46

Use the built-in self-test feature

Front 47

3-81L

How might an installer verify correct GPS sentence to marine DSC VHF radio?

Back 47

Look for latitude and longitude on the display

Front 48

3-81L6

What steps must be taken to activate the DSC emergency signaling function on a marine VHF?

Back 48

Input of registered 9-digit MMSI