Key Topic 69: VHF Omnidirectional Range (VOR)

Question 1

3-69K1: All directions associated with a VOR station are related to:

A. Magnetic north.
B. North pole.
C. North star.
D. None of these.

Answer 1

A. Magnetic north.

Question 2

3-69K2: The rate that the transmitted VOR variable signal rotates is equivalent to how many revolutions per second?

A. 60
B. 30
C. 2400
D. 1800

Answer 2

B. 30

Question 3

3-69K3: What is the frequency range of the ground-based Very-high-frequency Omnidirectional Range (VOR) stations used for aircraft navigation?

A. 108.00 kHz to 117.95 kHz.
B. 329.15 MHz to 335.00 MHz.
C. 329.15 kHz to 335.00 kHz.
D. 108.00 MHz to 117.95 MHz.

Answer 3

D. 108.00 MHz to 117.95 MHz.

Question 4

3-69K4: Lines drawn from the VOR station in a particular magnetic direction are:

A. Radials.
B. Quadrants.
C. Bearings.
D. Headings.

Answer 4

A. Radials.

Question 5

3-69K5: The amplitude modulated variable phase signal and the frequency modulated reference phase signal of a Very-high-frequency Omnidirectional Range (VOR) station used for aircraft navigation are synchronized so that both signals are in phase with each other at _______ of the VOR station.

A. 180 degrees South, true bearing position.
B. 360 degrees North, magnetic bearing position.
C. 180 degrees South, magnetic bearing position.
D. 0 degrees North, true bearing position.

Answer 5

B. 360 degrees North, magnetic bearing position.

Question 6

3-69K6: What is the main underlying operating principle of the Very-high-frequency Omnidirectional Range (VOR) aircraft navigational system?

A. A definite amount of time is required to send and receive a radio signal.

B. The difference between the peak values of two DC voltages may be used to determine an aircraft’s altitude above a selected VOR station.

C. A phase difference between two AC voltages may be used to determine an aircraft’s azimuth position in relation to a selected VOR station.

D. A phase difference between two AC voltages may be used to determine an aircraft’s distance from a selected VOR station.

Answer 6

C. A phase difference between two AC voltages may be used to determine an aircraft’s azimuth position in relation to a selected VOR station.