MTN COMM EXAM 2025
QUESTIONS AND ANSWERS
Omni-directional - ANSWER✔✔-Radiates and receives radio waves in ALL directions.
Uni-directional - ANSWER✔✔-Radiates and receives radio waves in ONLY ONE
direction.
Bi-directional - ANSWER✔✔-Radiates and receives radio waves in TWO directions.
Diffraction - ANSWER✔✔-The process by which electromagnetic waves are bent so that
they appear behind an obstruction.
Directivity - ANSWER✔✔-The property of radiating more energy in some directions
than in others.
Gain - ANSWER✔✔-The increase in signal strength that is produced by an amplifier.
Impedance - ANSWER✔✔-The measure of how difficult it is for current to flow through
a conductor.
, Noise - ANSWER✔✔-Random pulses of electromagnetic energy generated by lightning
or electrical equipment.
Reflection - ANSWER✔✔-The turning back of a radio wave from an object or the
surface of the earth.
Refraction - ANSWER✔✔-The bending, or changing direction, of a radio wave passing
into or through layers of the atmosphere or the ionosphere that have different density
(dielectric constant).
Resistance - ANSWER✔✔-The property of material or substance to oppose the passage
of current through it, thus causing electrical energy to be converted into heat energy.
Resonance - ANSWER✔✔-The state or frequency of vibration, electrical or mechanical,
in which forces that impede the motion are minimum.
Skip zone - ANSWER✔✔-Is the area that starts when the ground wave ends and
continues until the sky wave hits the earths surface.
Take off angle - ANSWER✔✔-The angle measured from the earths surface or horizontal
up to the direction of propagation towards the ionosphere.
NVIS - ANSWER✔✔-Near Vertical Incidence Sky wave allows for decreased skip zones
and is extremely beneficial when operating in complex compartmentalized terrain.
NVIS in theory allows for successful communications in distances ranging from 10-300
miles.
QUESTIONS AND ANSWERS
Omni-directional - ANSWER✔✔-Radiates and receives radio waves in ALL directions.
Uni-directional - ANSWER✔✔-Radiates and receives radio waves in ONLY ONE
direction.
Bi-directional - ANSWER✔✔-Radiates and receives radio waves in TWO directions.
Diffraction - ANSWER✔✔-The process by which electromagnetic waves are bent so that
they appear behind an obstruction.
Directivity - ANSWER✔✔-The property of radiating more energy in some directions
than in others.
Gain - ANSWER✔✔-The increase in signal strength that is produced by an amplifier.
Impedance - ANSWER✔✔-The measure of how difficult it is for current to flow through
a conductor.
, Noise - ANSWER✔✔-Random pulses of electromagnetic energy generated by lightning
or electrical equipment.
Reflection - ANSWER✔✔-The turning back of a radio wave from an object or the
surface of the earth.
Refraction - ANSWER✔✔-The bending, or changing direction, of a radio wave passing
into or through layers of the atmosphere or the ionosphere that have different density
(dielectric constant).
Resistance - ANSWER✔✔-The property of material or substance to oppose the passage
of current through it, thus causing electrical energy to be converted into heat energy.
Resonance - ANSWER✔✔-The state or frequency of vibration, electrical or mechanical,
in which forces that impede the motion are minimum.
Skip zone - ANSWER✔✔-Is the area that starts when the ground wave ends and
continues until the sky wave hits the earths surface.
Take off angle - ANSWER✔✔-The angle measured from the earths surface or horizontal
up to the direction of propagation towards the ionosphere.
NVIS - ANSWER✔✔-Near Vertical Incidence Sky wave allows for decreased skip zones
and is extremely beneficial when operating in complex compartmentalized terrain.
NVIS in theory allows for successful communications in distances ranging from 10-300
miles.
