Key Topic 68: Distance Measuring Equipment

Question 1

3-68K1: What is the frequency range of the Distance Measuring Equipment (DME) used to indicate an aircraft’s slant range distance to a selected ground-based navigation station?

A. 108.00 MHz to 117.95 MHz
B. 108.10 MHz to 111.95 MHz
C. 962 MHz to 1213 MHz
D. 329.15 MHz to 335.00 MHz.

Answer 1

C. 962 MHz to 1213 MHz

Question 2

3-68K2: The Distance Measuring Equipment (DME) measures the distance from the aircraft to the DME ground station. This is referred to as:

A. DME bearing.
B. The slant range.
C. Glide Slope angle of approach.
D. Localizer course width.

Answer 2

B. The slant range.

Question 3

3-68K3: The Distance Measuring Equipment (DME) ground station has a built-in delay between reception of an interrogation and transmission of the reply to allow:

A. Someone to answer the call.
B. The VOR to make a mechanical hook-up.
C. Operation at close range.
D. Clear other traffic for a reply.

Answer 3

C. Operation at close range.

Question 4

3-68K4: What is the main underlying operating principle of an aircraft’s Distance Measuring Equipment (DME)?

A. A measurable amount of time is required to send and receive a radio signal through the Earth’s atmosphere.
B. The difference between the peak values of two DC voltages may be used to determine an aircraft’s distance to another aircraft.
C. A measurable frequency compression of an AC signal may be used to determine an aircraft’s altitude above the earth.
D. A phase inversion between two AC voltages may be used to determine an aircraft’s distance to the exit ramp of an airport’s runway.

Answer 4

A. A measurable amount of time is required to send and receive a radio signal through the Earth’s atmosphere.

Question 5

3-68K5: What radio navigation aid determines the distance from an aircraft to a selected VORTAC station by measuring the length of time the radio signal takes to travel to and from the station?

A. RADAR.
B. Loran C.
C. Distance Marking (DM)
D. Distance Measuring Equipment (DME).

Answer 5

D. Distance Measuring Equipment (DME).

Question 6

3-68K6: The majority of airborne Distance Measuring Equipment systems automatically tune their transmitter and receiver frequencies to the paired ___/___ channel.

A. VOR/marker beacon.
B. VOR/LOC.
C. Marker beacon/glideslope
D. LOC/glideslope.

Answer 6

B. VOR/LOC.