Communication And Navigation

Question 1

What most common frequency range is used today

Answer 1

VHF (very high frequency)

Question 2

What is the function of VOR equipment

Answer 2

Navigation

Question 3

What does the term ADF stand for

Answer 3

Airborne direction finder

Question 4

Name components of a typical airborne VOR navigation system

Answer 4

Receiver, visual indicator, antennas, and frequency selector

Question 5

What does DME stand for

Answer 5

Distance measuring equipment

Question 6

At what interval must an ATC transponder system be certified

Answer 6

Every 24 calendar months

Question 7

Why are two antennas usually required for an ILS system

Answer 7

The localizer and glideslope because they have different frequancys

Question 8

What is the power source for an ELT

Answer 8

An internal battery

Question 9

Describe one method of monitoring the signal output during an ELT test

Answer 9

Tune a communications receiver to 121.5 MHz

Question 10

How would you determine if the batteries in an ELT are due for recharge or replacement

Answer 10

By looking for an expiration date or in the aircraft maintenance records

Question 11

At what time is a test of an installed ELT permitted

Answer 11

During the first 5 minutes after the hour and for no more that 3 sweeps

Question 12

Where on the aircraft would you expect to find a DME antenna

Answer 12

On the bottom of the fuselage in a location that isn’t blocked by the wing during turns

Question 13

Describe the shape and location of a transponder antenna

Answer 13

Either a short blade or a short wire with a ball end located on the bottom of the fuselage

Question 14

Name the basic components of an autopilot system

Answer 14

Gyros, servos, a controller, and an amplifier or computer

Question 15

What are the sensing elements of an autopilot system

Answer 15

Directional , altitude control, turn-and-bank gyro, and altitude gyro

Question 16

What is the function of the servos in an autopilot system

Answer 16

Actuate the flight controls

Question 17

Describe the procedure used to route coaxial cable from an antenna to a receiver

Answer 17

Supported every 2 feet, bends should be 10 times the cable diameter and it should be routed separately from other wires

Question 18

What is a transceiver

Answer 18

Independent transmitter and receiver that shares the same power supply, antenna and tuning device

Question 19

What are the basic components of a radio communication system

Answer 19

Microphone,transmitter, transmitting and receiving antennas, receiver, and speaker or headphones

Question 20

What is the purpose of a bonding jumper on a radio shock mount

Answer 20

Provides a low impedance ground return and minimize radio interference from static electricity

Question 21

What two types of antenna are used with most ADF receivers

Answer 21

Directional loop antenna and a non directional sense antenna

Question 22

What is the preferred location for a VOR antenna on an airplane

Answer 22

On top if the aircraft, along the center line of the fuselage

Question 23

What frequency band is used for most aircraft communications

Answer 23

VHF band between 30 and 300 MHz

Question 24

Is a certificated airframe mechanic allowed to adjust a communication transmitter

Answer 24

No. You need a license issued by the Federal Communications Commission

Question 25

What are marker beacons

Answer 25

Gives the aircraft position well approaching the runway

Question 26

What is the indication of the middle marker beacon

Answer 26

Amber light