2a553a CDC Volume 4

100 Questions | By Egramza | Updated: Mar 19, 2022 | Attempts: 813

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Volume 4 of the Comm/Nav CDCs

Questions and Answers

1.

What is the purpose of VOR?
- A.
  
  Determine bearing to a stations
- B.
  
  Indicate distances along the approach
- C.
  
  Determine left/right guidance
- D.
  
  Determine up/down guidance
2.

The basic operating principle of VOR is phase comparing the
- A.
  
  90 and 150 Hz modulated signals
- B.
  
  30 Hz reference and 9,960 Hz FM signals
- C.
  
  30 Hz variable and 9,960 Hz FM signals
- D.
  
  30 Hz reference and 30 Hz variable signals
3.

If the magnetic bearing to a VOR station is 225 degrees, the phase difference between the 30 Hz reference and 30 Hz variable signal is
- A.
  
  225 degrees
- B.
  
  135 degrees
- C.
  
  15 degrees
- D.
  
  45 degrees
4.

VOR identification (audible) signals are transmitted
- A.
  
  At 20 second intervals
- B.
  
  At specified time intervals
- C.
  
  At 30 second intervals
- D.
  
  Continuously
5.

The ILS localizer course width at a distance of 10 miles from the transmitter is normally
- A.
  
  0.7 degrees
- B.
  
  2.5 degrees
- C.
  
  0.5 degrees
- D.
  
  5 degrees
6.

What frequency is used to transmit ILS glide slope information?
- A.
  
  HF
- B.
  
  VHF
- C.
  
  LF
- D.
  
  UHF
7.

The ILS marker beacon carrier frequency is
- A.
  
  68.1 MHz
- B.
  
  75 kHz
- C.
  
  75 MHz
- D.
  
  68.1 kHz
8.

What MLS outputs are provided to the pilot's and copilot's HSIs for approach and takeoff?
- A.
  
  Ground station indications
- B.
  
  Azimuth signals
- C.
  
  Steering indications
- D.
  
  Elevation signals
9.

What is not an MLS output?
- A.
  
  Azimuth deviation
- B.
  
  Azimuth warning flag
- C.
  
  Glide slope correction flag
- D.
  
  Glide slope deviation
10.

On how many channels are the MLS receivers capable of operating?
- A.
  
  559
- B.
  
  500
- C.
  
  669
- D.
  
  200
11.

What is the frequency range of the MLS receivers?
- A.
  
  5031-5091 MHz
- B.
  
  200-500 MHz
- C.
  
  500-669 MHz
- D.
  
  669-5031 MHz
12.

Which antennas are shared by MLS numbers 1 and 2?
- A.
  
  3 and 4
- B.
  
  3 and 2
- C.
  
  1 and 3
- D.
  
  1 and 2
13.

Which MLS landing system component allows for selection of system status?
- A.
  
  Receiver power on relay
- B.
  
  Integrated display computer unit
- C.
  
  Flight director mode selector
- D.
  
  Data bus coupler
14.

When an ILS frequency is selected, the ARN-127 VOR receiver parks the HSI bearing pointer at the
- A.
  
  10 o'clock position
- B.
  
  6 o'clock position
- C.
  
  3 o'clock position
- D.
  
  4 o'clock position
15.

Which radial will the aircraft be positioned on if the aircraft is located north of the VOR station?
- A.
  
  090 degrees
- B.
  
  270 degrees
- C.
  
  000 degrees
- D.
  
  180 degrees
16.

To get a FROM flag in view on the HSI when the magnetic bearing to the VOR station is 75 degrees, the selected course should be manually set to
- A.
  
  75 degrees
- B.
  
  360 degrees
- C.
  
  150 degrees
- D.
  
  210 degrees
17.

During ILS operation, a full-scale deflection of the HSI vertical needle indicates the aircraft is off course from the runway centerline by
- A.
  
  2.5 degrees
- B.
  
  200 feet
- C.
  
  400 feet
- D.
  
  0.6 degrees
18.

In ILS operation, a deflection of two dots on the attitude director indicator glide slope deviation scale indicates the aircraft is
- A.
  
  2.5 degrees off glide path
- B.
  
  6.0 degrees off glide path
- C.
  
  0.6 degrees off glide path
- D.
  
  0.25 degrees off glide path
19.

When the ILS marker beacon amber (orange) lamp illuminates, the pilot hears a
- A.
  
  3,000 Hz tone
- B.
  
  1,000 Hz tone
- C.
  
  1,300 Hz tone
- D.
  
  400 Hz tone
20.

The total number of VOR/ILS channels that can be selected by the AN/ARN-147 control box is
- A.
  
  240
- B.
  
  200
- C.
  
  40
- D.
  
  160
21.

If the VOR station signal is lost or the receiver malfunctions, the ARN-147 system parks the bearing pointer at the
- A.
  
  12 o'clock position
- B.
  
  3 o'clock position
- C.
  
  9 o'clock position
- D.
  
  6 o'clock position
22.

In VOR mode, what information is sent to the HSI by the ARN-147 VOR/localizer receiver?
- A.
  
  TO/FROM, heading, and relative bearing
- B.
  
  Left/right deviation, flag alarm, and TO/FROM
- C.
  
  Relative bearing, flag alarm, and heading
- D.
  
  Flag alarm, distance, and left/right deviation
23.

What glide slope information is provided to the attitude director indicator when the AN/ARN-127 is oeprating in the ILS mode?
- A.
  
  Navigation signals
- B.
  
  Audio signals
- C.
  
  Left/right deviations
- D.
  
  Up/down deviations
24.

The main reference burst is transmitted when the main lobe of the TACAN surface beacon radiation pattern is due
- A.
  
  South
- B.
  
  North
- C.
  
  West
- D.
  
  East
25.

A TACAN beacon provides a station identification code every
- A.
  
  7.5 seconds
- B.
  
  20 seconds
- C.
  
  40 seconds
- D.
  
  30 seconds