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Question 69-1 : Radio theory wavelength is defined as the ? [ Concept DJI ]

Physical distance travelled by a radio wave during one cycle of transmission

Question 69-2 : Radio theory the mix of an electromagnetic wave with another is called ?

Interference.

exemple 73: Interference
Diffraction. refraction. reflection.

Question 69-3 : Radio theory the phenomenon of a change in direction of an radio wave em wave occurring due to a change in its speed is called ?

Refraction.

exemple 77: Refraction
Absorption. diffraction. attenuation.

Question 69-4 : Radio theory the phenomenon by which wave energy bends around a permeable obstacle is called ?

Diffraction.

exemple 81: Diffraction
Refraction. attenuation. absorption.

Question 69-5 : Radio theory vhf very high frequency waves appear in the frequency spectrum ?

30 mhz 300 mhz.

exemple 85: 30 mhz 300 mhz
3 mhz - 30 mhz 300 mhz - 3000 mhz 3 ghz - 30 ghz

Question 69-6 : Radio theory when the fading damping of a radio wave is so important that no signal can be received this phenomenon is ?

Absorption.

exemple 89: Absorption
Diffraction. refraction. reflection.

Question 69-7 : Radio theory to double the effective range of a radio transmission the power output must be increased by a factor of ?

4.

exemple 93: 4
2. 8. 16.

Question 69-8 : Radio theory 'fading' is ?

Interference between surface wave and sky wave.

exemple 97: Interference between surface wave and sky wave
Disappearance of the layer d at dusk. reflection of waves on the ionosphere. an abnormal increase in the amplitude of electromagnetic waves.

Question 69-9 : Radio theory radio waves travel at ?

The speed of light.

exemple 101: The speed of light
The speed of sound. a speed depending on the type of the electromagnetic waves. a speed just below the speed of sound.

Question 69-10 : Radio theory radio waves travel at a speed of ?

300000 kms.

exemple 105: 300000 kms
30000 km/s. 300000 m/s. 3000000 m/s.

Question 69-11 : Radio theory a radio signal looses strength as range from the transmitter increases this is called ?

Attenuation.

exemple 109: Attenuation
Refraction. propagation. ducting.

Question 69-12 : Radio theory an electromagnetic wave has two types of energy field ?

An e electrical field and h magnetic field.

Question 69-13 : Radio theory an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h which statement is correct ?

The e and h fields are perpendicular to each other.

exemple 117: The e and h fields are perpendicular to each other
A dipole antenna can only transmit field (h). the (h) field is parallel to the wire and field (e) is perpendicular to the wire. when ac current pass through the antenna, fields (e) and (h) are parallel.

Question 69-14 : Radio theory an electromagnetic wave consists of an oscillating electric field e and an oscillating magnetic field h their propagation speed is ?

The speed of light.

Question 69-15 : A position located east of the prime meridian and south of the equator is ?

East longitude and south latitude.




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