3D1X3 Volume 2
Volume 2 of 3D1X3 (URE's)
- 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
Correct Answer
C. A transmitter -
- 2.
(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?
- A.
Reproduction
- B.
Reception
- C.
Detection
- D.
Selection
Correct Answer
B. Reception -
- 3.
(201) The ability of a receiver to reproduce the signal of a very weak station is the characteristic of the receiver’s
- A.
Fidelity
- B.
Capacity
- C.
Sensitivity
- D.
Selectivity
Correct Answer
C. Sensitivity -
- 4.
(201) The ability to reproduce the input signal accurately is the characteristics of the receiver’s
- A.
Fidelity
- B.
Capacity
- C.
Sensitivity
- D.
Selectivity
Correct Answer
A. Fidelity -
- 5.
(202) Which of the following CANNOT be performed by the transceiver’s computerized components and micro-circuitry?
- A.
Specific equipment faults
- B.
Internal equipment tests
- C.
Internal calibrations
- D.
Repair itself
Correct Answer
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
Correct Answer
A. Copper -
- 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
Correct Answer
D. Very high-resistance dielectric -
- 8.
(203) A transmission line that consists of a center conductor placed inside a rigid metal tube functioning as the outer tube is called a
- A.
Flexible coaxial cable
- B.
Rigid coaxial cable
- C.
Waveguide
- D.
Twin lead
Correct Answer
B. Rigid coaxial cable -
- 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
Correct Answer
A. Very slight damage to the external surface of a waveguide can cause arcing. -
- 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
Correct Answer
B. Inductance and capacitance -
- 11.
(203) Using figure 1–10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.
- A.
8.33 meters
- B.
8.33 wavelengths
- C.
83.3 meters
- D.
83.3 wavelengths
Correct Answer
B. 8.33 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
Correct Answer
C. With constant physical length, frequency and electrical length are directly 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
Correct Answer
B. Having no reflected waves -
- 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.
Correct Answer
B. There would be significant signal loss -
- 15.
(204) The concept that alternating current changes in magnitude and reverses its direction during each 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
Correct Answer
C. What makes radio transmission possible -
- 16.
(204) At what point do magnetic fields around a wire no longer have time to collapse completely between alternations?
- A.
60 cycles per second (cps).
- B.
120 cps.
- C.
10,000 cps.
- D.
15,000 cps.
Correct Answer
C. 10,000 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
Correct Answer
A. Radiation -
- 18.
(204) Areas in which no antenna radiation pattern passes through are called
- A.
Nulls
- B.
Lobes
- C.
Free space
- D.
Nonresonant
Correct Answer
A. Nulls -
- 19.
(205) If the electric field component travels in a plane perpendicular to the Earth’s surface, the radio wave is considered to be polarized
- A.
Magnetically
- B.
Horizontally
- C.
Circularly
- D.
Vertically
Correct Answer
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
Correct Answer
C. Frequency range -
- 21.
(206) What measurement is used to determine whether an antenna is resonant at a particular frequency?
- A.
Distortion
- B.
Standing wave ratio
- C.
Signal-to-noise ratio
- D.
Percent of modulation
Correct Answer
B. Standing wave ratio -
- 22.
(206) The ability of an antenna to both receive and transmit equally well is known as the antenna’s
- A.
Bandwidth
- B.
Resonance
- C.
Reciprocity
- D.
Effectiveness
Correct Answer
C. Reciprocity -
- 23.
(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
Correct Answer
B. Isotropic antenna -
- 24.
(206) What does the overall effectiveness of an entire transmitting and receiving system depend largely upon?
- A.
Impedance matching
- B.
Antenna distance
- C.
Antenna properties
- D.
Line characteristics
Correct Answer
A. Impedance matching -
- 25.
(207) Which antenna radiates radio energy equally well in all directions?
- A.
Omni-directional
- B.
Uni-directional
- C.
Bi-directional
- D.
Directional
Correct Answer
A. Omni-directional -
- 26.
(207) Which antenna type is usually used on long-range, point-to-point communication where the concentrated radio energy is needed for circuit reliability?
- A.
Omni-directional
- B.
Uni-directional
- C.
Bi-directional
- D.
Circular
Correct Answer
B. Uni-directional -
- 27.
(208) Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a
- A.
Reflector
- B.
Hertz antenna
- C.
Marconi antenna
- D.
Vertical monopole
Correct Answer
B. Hertz antenna -
- 28.
(208) A dipole or long-wire antenna is an example of a
- A.
Whip antenna
- B.
Hertz antenna
- C.
Marconi antenna
- D.
Vertical monopole
Correct Answer
B. Hertz antenna -
- 29.
(209) What type of directivity does the whip antenna provide?
- A.
Bidirectional
- B.
Unidirectional
- C.
Omni-directional
- D.
Near vertical directional
Correct Answer
C. Omni-directional -
- 30.
(209) What is probably the worst antenna that can be used on sky-wave circuits?
- A.
Whip
- B.
Dipole
- C.
Rhombic
- D.
Discone
Correct Answer
A. Whip -
- 31.
(209) What antenna radiates or receives on many of its particular elements?
- A.
Whip
- B.
Dipole
- C.
Discone
- D.
Log-periodic
Correct Answer
D. Log-periodic -
- 32.
(209) What is one of the simplest and most functional antennas in use?
- A.
Quarter-wave vertical
- B.
Half-wave dipole
- C.
Inverted-V
- D.
GRA–4
Correct Answer
B. Half-wave dipole -
- 33.
(209) What is the minimum length for a long-wire antenna?
- A.
One-quarter wavelength
- B.
One-half wavelength
- C.
One wavelength
- D.
Two wavelengths
Correct Answer
B. One-half wavelength -
- 34.
(209) A long-wire’s takeoff angle depends on the antenna’s
- A.
Length
- B.
Directivity
- C.
Front-to-back ratio
- D.
Standing wave ratio
Correct Answer
A. Length -
- 35.
(209) A common satellite antenna is the
- A.
Whip
- B.
Discone
- C.
Parabolic
- D.
Long-wire
Correct Answer
C. Parabolic -
- 36.
(209) A helical satellite antenna radiates a signal with what type of polarization?
- A.
Horizontal
- B.
Vertical
- C.
Circular
- D.
Linear
Correct Answer
C. Circular -
- 37.
(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?
- A.
Fixed blade
- B.
Conformal
- C.
Probe tip
- D.
Whip
Correct Answer
B. Conformal -
- 38.
(211) In selecting an antenna for a circuit, what is the first thing to consider?
- A.
Type of propagation
- B.
Type of antenna
- C.
Distance of the communication
- D.
Operating frequency of the antenna
Correct Answer
A. Type of propagation -
- 39.
(211) In HF communications, by replacing the vertical antenna with a dipole antenna that’s a quarter wavelength off the ground, what are you able to get from your antenna transmission?
- A.
Higher take-off angle
- B.
Increase efficiency
- C.
Better reciprocity
- D.
Twice the gain
Correct Answer
A. Higher take-off angle -
- 40.
(212) What has the greatest effect on an antenna?
- A.
The sun
- B.
The earth
- C.
The operator
- D.
The ionosphere
Correct Answer
B. The earth -
- 41.
(212) Which environment would be considered the most challenging for an RF transmission systems technician to establish and operate a radio station from?
- A.
Amazon
- B.
North Pole
- C.
Sahara Desert
- D.
Sierra Nevada Mountains
Correct Answer
A. Amazon -
- 42.
(212) Radio sets are left on 24-hours a day in a jungle environment to
- A.
Combat fungus
- B.
Keep insects away
- C.
Prevent short circuits
- D.
Maintain frequency stability.
Correct Answer
C. Prevent short circuits -
- 43.
(212) Which environment area will increase maintenance problems with dust and sand?
- A.
Polar
- B.
Jungle
- C.
Desert
- D.
Mountainous
Correct Answer
C. Desert -
- 44.
(212) In mountainous terrain, with a mountain between you and the distant end, which of these antennas is more effective?
- A.
Whip
- B.
Dipole
- C.
Discone
- D.
Near-vertical incidence skywave.
Correct Answer
D. Near-vertical incidence skywave. -
- 45.
(213) Radio waves that travel near the earth’s surface are called
- A.
Earth waves
- B.
Global waves
- C.
Ground waves
- D.
Terrestrial waves
Correct Answer
C. Ground waves -
- 46.
(213) The earth’s conductivity is determined by the type of
- A.
Air and moisture content in the propagation path.
- B.
Antenna being used at the time of transmission.
- C.
Soil and water in the propagation path.
- D.
Soil and air in the propagation path.
Correct Answer
C. Soil and water in the propagation path. -
- 47.
(213) Sky wave transmission is used for which type of communications?
- A.
Long distance.
- B.
Subterrestrial
- C.
Atmospheric
- D.
Line of sight.
Correct Answer
A. Long distance. -
- 48.
(214) The angle at which a radio wave enters the ionosphere is known as the
- A.
Skip angle.
- B.
Critical angle.
- C.
Angle of entrance.
- D.
Angle of incidence.
Correct Answer
D. Angle of incidence. -
- 49.
(214) Radio waves that angled too low are
- A.
Absorbed
- B.
Refracted
- C.
Returned to earth.
- D.
Passed into space.
Correct Answer
A. Absorbed -
- 50.
(214) In HF communications, the lowest frequency that arrives at the distant receiver on 90 percent of the undisturbed days of the month is called the
- A.
Maximum usable frequency.
- B.
Lowest usable frequency.
- C.
Operating frequency.
- D.
Critical frequency.
Correct Answer
B. Lowest usable frequency. -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Nov 25, 2014Quiz Edited by
ProProfs Editorial Team -
Jul 11, 2013Quiz Created by
RFTrans
- 1W0510 Quizzes
- 2A251 Quizzes
- 2A552 Quizzes
- 2A651 Quizzes
- 2A652 Quizzes
- 2A654 Quizzes
- 2A656 Quizzes
- 2A671 Quizzes
- 2A6X1 Quizzes
- 2A753 Quizzes
- 2A852 Quizzes
- 2AX5X Quizzes
- 2AX7X Quizzes
- 2S051 Quizzes
- 2s071 Quizzes
- 2T251 Quizzes
- 3d052 Quizzes
- 3d054 Quizzes
- 3D151 Quizzes
- 3D152 Quizzes
- 3D153 Quizzes
- 3DX7X Quizzes
- 3e6x1 Quizzes
- 3P071 Quizzes
- 5j0x1 Quizzes
- Z3dx7x Quizzes
Back to top