Z3D153 Volume 2 Ure
- 1.Which US government agency divides the radio frequency spectrum into different bands?
- A.
Federal Aviation Agency.
- B.
American National Standard Institute.
- C.
Federal Communications Commission (FCC).
- D.
Institute of Electrical & Electronics Engineers, Inc.
- 2.High-frequency (HF) transmissions are normally conducted in which two operating modes?
- A.
Frequency modulation (FM) and independent sidebands (ISB).
- B.
Continuous wave (CW) and amplitude modulation (AM).
- C.
Single side band (SSB) and FM.
- D.
SSB and ISB.
- 3.Which frequency band is most susceptible to jamming?
- A.
Low frequency (LF)
- B.
Medium frequency (MF).
- C.
High frequency (HF).
- D.
Very high frequency (VHF).
- 4.The ability of a receiver to reproduce the signal of a very weak station is characteristic of a receiver’s
- A.
Fidelity.
- B.
Capacity.
- C.
Sensitivity
- D.
Selectivity.
- 5.The ability of a receiver to reproduce the input signal accurately is characteristic of its
- A.
Fidelity
- B.
Capacity
- C.
Sensitivity.
- D.
Selectivity
- 6.A combination transmitter and receiver, built as a single unit and shares common tuned circuits, is called a
- A.
Transmitter.
- B.
Transceiver.
- C.
Receiver
- D.
Coupler.
- 7.Conductor material resistance in a transmission line leads to this type of loss.
- A.
Copper.
- B.
Radiation
- C.
Inductive
- D.
Skin-effect
- 8.The amount of skin-effect loss is directly proportional to the
- A.
Line length
- B.
Frequency
- C.
Voltage level
- D.
Resistive loss
- 9.Leakage loss in a transmission line is minimized by using a
- A.
Thinner conductor
- B.
thicker conductor
- C.
Very low-resistance dielectric
- D.
Very high-resistance dielectric.
- 10.A transmission line that consists of a center conductor, placed inside a rigid metal tube that functions as the outer shield, is called
- A.
Flexible coaxial cable.
- B.
Rigid coaxial cable.
- C.
Waveguide
- D.
Twin lead
- 11.A waveguide is a type of transmission line that you would use
- A.
When the frequencies are so high that their wavelength is miniscule.
- B.
to transmit on frequencies too low for ground propagation.
- C.
for high power at frequencies up to 30 megahertz (MHz) primarily.
- D.
To receive television frequencies over the air.
- 12.All statements concerning waveguides are true except
- A.
Their outer surface will arc from being very slightly damaged.
- B.
Their conductive material construction is easily dented.
- C.
Their effectiveness is hindered by moisture.
- D.
They can be destroyed by corrosion.
- 13.Which two transmission line properties determine its characteristic impedance (ZO)?
- A.
Inductance and resistance.
- B.
Inductance and capacitance
- C.
Resistance and capacitance.
- D.
Length and type of shielding.
- 14.This is the correct statement concerning a wavelength.
- A.
Wavelength is inversely related to frequency.
- B.
Wavelength is directly related to frequency.
- C.
Wavelength is determined by the line length.
- D.
Wavelength is expressed in lambdas (λ).
- 15.Determine the wavelength of a 250 megahertz (MHz) signal.
- A.
12.0 meters
- B.
3.0 meters
- C.
1.5 meters
- D.
1.2 meters
- 16.A nonresonant transmission line is one with
- A.
Reflected waves
- B.
No reflected waves
- C.
Maximum voltage across its open termination.
- D.
Maximum voltage across its shorted termination.
- 17.When discussing resonant and nonresonant transmission lines,
- A.
Resonant lines are often referred to as flat lines
- B.
Maximum power transfer results from a resonant line
- C.
Maximum power transfer results from a nonresonant line
- D.
Significant loss and damage to equipment results from using a nonresonant line.
- 18.This will likely result if a transmission line is terminated in an open.
- A.
Signal loss would be negligible.
- B.
Signal loss would be significant.
- C.
Current would be maximum at the termination.
- D.
Voltage would be minimum at the termination
- 19.Direct waves are radio waves that travel
- A.
Long distances with few interruptions.
- B.
From point to point along the Earth’s surface.
- C.
No more than 20 miles to the receive antenna
- D.
Through the air in a straight line from transmitter to receiver
- 20.Radio waves that travel near the Earth’s surface are called
- A.
Earth waves
- B.
Global waves
- C.
Ground waves
- D.
Terrestrial waves
- 21.The Earth’s conductivity is determined by the type of
- A.
Atmospheric conditions at the time of transmission.
- B.
Air and moisture content in the propagation path.
- C.
Soil and water in the propagation path.
- D.
soil and air in the propagation path
- 22.This term is used to describe radio waves that bend as they travel from one medium to another that has different density
- A.
Diffusion
- B.
Diffraction
- C.
Refraction
- D.
Reflection
- 23.The refractive index of air depends on moisture
- A.
Atmospheric pressure, and temperature.
- B.
atmospheric pressure, and frequency.
- C.
Receive signal level, and temperature
- D.
Receive signal level, and frequency.
- 24.When comparing the radio and optical horizons, which one is farther away and by what percentage?
- A.
Optical; 15
- B.
Radio; 15.
- C.
Optical; 33.
- D.
Radio; 33
- 25.Which process permits communication in shadow regions behind obstacles?
- A.
Reflection
- B.
Scattering
- C.
Refraction
- D.
Diffraction
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