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Military

Practice Exercise
Lesson 2

Instructions The following items will test your understanding of the material covered in this lesson. There is only one correct answer for each item. When you have completed the exercise, check your answers with the answer key that follows. If you answer any item incorrectly, review that part of the lesson which contains the portion involved.
1. Which statement describes the half-wave antenna?

A. It is used at lower frequencies
B. It cannot be used on a vehicle
C. Unlike the quarter-wave antenna, it is not center fed
D. It can extend the signal range to 300 miles and beyond using sky wave propagation
2. What should be the height of the vertical radiator of a whip antenna?

A. A quarter wavelength
B. A half wavelength
C. A full wavelength
D. Two wavelengths
3. The RC-292 and OE-254 are what type of antennas?

A. Directional VHF
B. Bidirectional VHF
C. Omnidirectional FM
D. Omnidirectional AM
4. Which statement describes the unidirectional log-periodic antenna?

A. It operates in the 30- to 90-MHz frequency range
B. Its radiation pattern provides very effective electronic countermeasures
C. It provides an extended range for tactical radios
D. Its radiated energy is not focused in one direction
5. The NVIS antenna uses what type of polarization?

A. Vertical only
B. Elliptical and horizontal
C. Elliptical and vertical
D. Horizontal and vertical
6. Which characteristic describes the antenna matching unit?

A. Changes the modulation from AM to FM
B. Matches the frequency to the radiation pattern
C. Varies the electrical length of the antenna to accommodate a range of frequencies
D. Varies the electrical length of the antenna to accommodate a change in radiation pattern
7. Which statement describes antenna use by SINCGARS?

A. The RC-292 can extend the range of the SINCGARS systems up to 36 miles
B. SINCGARS uses broadband antennas
C. SINCGARS uses broadband antennas
D.SINCGARS antennas have to be changed with changing frequencies
8. The AN/PSC-3 TACSAT system can transmit up to how many watts in the at-halt mode?

A. 2
B. 3
C. 20
D. 35
9. Which statement describes the horn-type antenna?

A. It must be adjusted each time the frequencies are changed
B. It is a directional antenna
C. It can only be horizontally polarized
D. Elevation angles may be made at its front, as needed
10. Which statement describes antenna use?

A. A vertical half-rhombic antenna does not have a directional radiation pattern
B. A long-wire antenna has a directional radiation pattern
C. a vertical half-rhombic antenna can operate as low as 2 feet above the ground
D. A long-wire antenna is used primarily for transmitting EHF signals