3D153 Vol 2 Ure
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- 1.(201) Equipment used for generating, amplifying, and transmitting RF carrier is collectively called
- A.
A receiver.
- B.
An antenna
- C.
A transmitter
- D.
A transmission line
- 2.(201) What basic receiver function involves having the transmitted electromagnetic wave passthrough the receive antenna in such a manner as to induce a voltage in the antenna?
- A.
Reproduction
- B.
Reception
- C.
Detection
- D.
Selection
- 3.(201) The ability of a receiver to reproduce the signal of a very weak station is the characteristic ofthe receiver’s
- A.
Fidelity
- B.
Capacity
- C.
Sensitivity
- D.
Selectivity
- 4.(201) The ability to reproduce the input signal accurately is the characteristics of the receiver’s
- A.
Fidelity
- B.
Capacity
- C.
Sensitivity
- D.
Fidelity
- 5.(202) Which of the following CANNOT be performed by the transceiver’s computerizedcomponents and micro-circuitry?
- A.
Specific equipment faults.
- B.
Internal equipment tests
- C.
Internal calibrations
- D.
Repair itself
- 6.(203) Resistance of the conductor material in a transmission line leads to which type of loss?
- A.
Copper
- B.
Radiation
- C.
Inductive
- D.
Skin-effect
- 7.(203) Leakage loss in a transmission line can be minimized by using a
- A.
Thinner conductor
- B.
Thicker conductor
- C.
Very low-resistance dielectric
- D.
Very high-resistance dielectric
- 8.(203) A transmission line that consists of a center conductor placed inside a rigid metal tubefunctioning as the outer tube is called a
- A.
Flexible coaxial cable.
- B.
Rigid coaxial cable.
- C.
Waveguide
- D.
Twin lead
- 9.(203) Which statement concerning waveguides is FALSE?
- A.
Very slight damage to the external surface of a waveguide can cause arcing.
- B.
Their conductive material construction is easily dented.
- C.
Effectiveness of waveguides is hindered by moisture.
- D.
Waveguides can be destroyed by corrosion.
- 10.(203) What two properties of a transmission line determine its characteristic impedance?
- A.
Inductance and resistance.
- B.
Inductance and capacitance.
- C.
Resistance and capacitance.
- D.
Length and type of shielding.
- 11.(203) Using figure 1–10, determine the electrical length if the frequency is changed from 150MHz to 250 MHz.
- A.
8.33 meters
- B.
8.33 wavelengths
- C.
83.3 meters
- D.
83.3 wavelengths
- 12.(203) Which statement concerning line lengths is TRUE?
- A.
Frequency and electrical length are inversely proportional.
- B.
Frequency and physical length are directly proportional.
- C.
With constant physical length, frequency and electrical length are directly related.
- D.
With constant physical length, frequency and electrical length are inversely related.
- 13.(203) A nonresonant transmission line is a line
- A.
Having reflected waves.
- B.
Having no reflected waves.
- C.
With maximum voltage across its open termination.
- D.
With maximum voltage across its shorted termination.
- 14.(203) If a transmission line is terminated in an open, what will likely result?
- A.
Signal loss would be negligible.
- B.
There would be significant signal loss.
- C.
Current would be at maximum at the termination.
- D.
Voltage would be at minimum at the termination.
- 15.(204) The concept that alternating current changes in magnitude and reverses its direction duringeach cycle is
- A.
An unproven hypothesis
- B.
The definition of propagation.
- C.
What makes radio transmission possible.
- D.
What led to the discovery of direct current.
- 16.(204) At what point do magnetic fields around a wire no longer have time to collapse completelybetween alternations?
- A.
60 cycles per second (cps).
- B.
120 cps
- C.
10,000 cps
- D.
15,000 cps
- 17.(204) Which basic field detaches from the antenna and travels through space at great distances?
- A.
Radiation
- B.
Induction
- C.
Gravitational
- D.
Electromotive
- 18.(204) Areas in which no antenna radiation pattern passes through are called
- A.
Nulls
- B.
Lobes
- C.
Free space
- D.
Nonresonant
- 19.(205) If the electric field component travels in a plane perpendicular to the Earth’s surface, theradio wave is considered to be polarized
- A.
Magnetically
- B.
Horizontally.
- C.
Circularly.
- D.
Vertically
- 20.(206) The actual range of frequencies within the antenna’s bandwidth is called the
- A.
Wavelength
- B.
Operating zone
- C.
Frequency range
- D.
Bandwidth range
- 21.(206) What measurement is used to determine whether an antenna is resonant at a particularfrequency?
- A.
Distortion.
- B.
Standing wave ratio.
- C.
Signal-to-noise ratio.
- D.
Percent of modulation.
- 22.(206) The standard used to measure the radiating effectiveness (gain) of an antenna system is the
- A.
Marconi antenna.
- B.
Isotropic antenna.
- C.
Hertz antenna.
- D.
Whip antenna.
- 23.(206) What does the overall effectiveness of an entire transmitting and receiving system dependlargely upon?
- A.
Impedance matching.
- B.
Antenna distance.
- C.
Antenna properties.
- D.
Line characteristics.
- 24.(206) The ability of an antenna to both receive and transmit equally well is known as theantenna’s
- A.
Bandwidth.
- B.
Resonance.
- C.
Reciprocity.
- D.
Effectiveness.
- 25.(207) Which antenna radiates radio energy equally well in all directions?
- A.
Omni-directional.
- B.
Uni-directional.
- C.
Bi-directional.
- D.
Directional.
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