Vol2 URE1 CDC 3D153

1. (206) The ability of an antenna to both receive and transmit equally well is known as the antenna's?

Bandwidth

Resonance

Reciprocity

Effectiveness

2. (202) A combination of a transmitter and receiver that is built as a single unit and sharing common tuned circuits is called a?

Transmitter

Transceiver

Receiver

Coupler

3. (203) A transmission line that consists of a center conductor placed inside a metal tube functioning as the outer tube is called a?

Flexible coaxial cable

Rigid coaxial cable

Waveguide

Twin lead

4. (206) What does the effectiveness of an entire transmitting and receiving system depend largely upon?

Impedance matching

Antenna distance

Antenna properties

Line characteristics

5. A nonresonant transmission line is a line?

Having reflected waves

Having no reflected waves

With maximum voltage across its open termination

With maximum voltage across its shorted termination

6. (201) Equipment used for generating, amplifying, and transmitting RF carrier is collectively called a?

A receiver

An antenna

A transmitter

A transmission line

7. (201) What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce a voltage in the antenna?

Reproduction

Reception

Detection

Selection

8. (201) The ability to reproduce the input signal accurately is the characteristics of the receiver's?

Fidelity

Capacity

Sensitivity

Selectivity

9. (202) Which of the following cannot be performed by the transceiver's computerized components and micro-circuitry?

Specific equipment faults

Internal equipment tests

Internal calibrations

Repair itself

10. (212) Where is the most challenging location for a radio frequency (RF) transmission systems technician to establish and operate a radio station from?

Amazon Jungle

North Pole

Sahara Desert

Sierra Nevada mountains

11. (203) Using figure 1–10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.

8.33 meters

8.33 wavelengths

83.3 meters

83.3 wavelengths

12. (204) The concept that alternating current (AC) changes in magnitude and reverses its direction during each cycle is?

An unproven hypothesis

The definition of propagation

What makes radio transmission possible

What led to the discovery of direct current

13. (209) A common satellite antenna is the?

Whip

Discone

Parabolic

Long-wire

14. (204) In a basic communication system, what converts radio frequency (RF) energy's current oscillation into electric and magnetic fields of force?

Antenna

Coupler

Transmitter

Transmission lines

15. (210) Which type of airborne antenna can be designed into any part of an aerospace vehicle's surface, so that it does not upset its aerodynamic properties?

Fixed blade

Conformal

Probe tip

Whip

16. (211) In selecting an antenna for a circuit, what is the first thing to look at?

Type of propagation

Selecting the antenna

Determine the distance

Finding the operating frequency

17. (205) If the electric field component travels in a plane perpendicular to the Earth's surface, the radio wave is?

Magnetically polarized

Horizontally polarized

Circularly polarized

Vertically polarized

18. (206) What measurement is used to determine whether an antenna is resonant at a particular frequency?

Distortion

Standing Wave Ratio

Signal-to-noise ratio

Percent of modulation

19. (209) A helical antenna radiates a signal with what type of polarization?

Horizontal

Vertical

Circular

Linear

20. (212) With a mountain between you and the distant end, which antenna is more effective?

Whip

Dipole

Discone

Near-Vertical Incidence skywave

21. (207) Which antenna radiates radio energy in a circular pattern?

Omnidirectional

Unidirectional

Bidirectional

Circular

22. (207) Which antenna type is usually used on long-range, point-to-point circuits where the concentrated radio energy is needed for circuitry reliability?

Omnidirectional

Unidirectional

Bidirectional

Circular

23. (209) A long-wire's takeoff angle depends on the antenna's?

Length

Directivity

Front-to-back ratio

Standing wave ratio

24. (210) Aircraft antennas are housed?

Inside nonconductive radomes mounted outside or flush with the fuselage.

Inside conductive radomes mounted outside or flush with the fuselage

Outside nonconductive radomes mounted outside the fuselage.

Inside conductive radomes mounted flush with the fuselage.

25. (210) What determines an antenna's location and orientation on the aircraft?

Antennas always reguire a 360 degree radiating pattern.

The type of aircraft propulsion and power system.

Antennas are always mounted on top of the fuselage.

Optimizing the antenna's radiating pattern for its application.

26. (203) If a transmission line is terminated in a short,

Current is maximum and voltage at minimum at the termination

Current is at minimum and voltage at maximum at the termination

There would be a nominal amount of signal gain

The line would be nonresonant

27. (205) What types of polarization do satellite terminals transmit and receive?

Transmit horizontal and receive vertical polarizations

Transmit vertical and receive horizontal polarizations

Transmit right hand and receive left hand circular polarizations.

Transmit left hand and receive right hand circular polarizations

28. (212) Which object has the greatest effect on an antenna?

Sun

Earth

Operator

Ionosphere

29. (206) The standard used to measure the radiating effectiveness (gain) of an antenna system is the?

Marconi antenna

Isotropic antenna

Hertz antenna

Whip antenna

30. (208) Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a?

Reflector

Hertz antenna

Marconi antenna

Vertical monopole

31. (203) Using figure 1–10, determine the wavelength if the frequency is changed from 150 MHz to 250 MHz.

12.0 meters.

3.0 meters

1.5 meters

1.2 meters

32. (209) All antennas used in satellite communications are designed to be?

Circular directional

Omnidirectional

Bidirectional

Directional

33. (210) In airborne antenna applications for frequencies in the upper portion of the HF band, what vertical angles are used for multi-hop, long distance transmission?

90 and 180 degrees

60 and 90 degrees

30 and 60 degrees

5 and 30 degrees

34. (203) Which selection best describes the term "cutoff frequency" when discussing transmission line properties?

The frequency where XL becomes so low that the signal is shunted.

The frequency where XC causes the signal to be shunted.

The lowest frequency that the line can pass successfully

The frequency at which standing waves are maximum.

Vol2 Ure1 CDC 3D153