For quiz 3

Question 1

Radio Frequency Bands

Answer 1

ELF (3 - 30 Hz)
SLF (30 - 300Hz)
ULF (300 - 3000 Hz)
VLF (3 - 30 kHz)
LF (30 -300 kHz)
MF (300 - 3000 kHz)
HF (3 - 30 MHz)
VHF (30 -300 MHZ)
UHF ( 300 - 3000 MHz)
SHF (3 - 30 GHz)
EHF (30 -300 GHz)

Question 2

the wave environment is free from everything except the wave itself.

Answer 2

Free space

Question 3

The orientation of the E-field component of the TEM wave is called its ____

Answer 3

Polarization

Question 4

If the direction remains constant with time at a fixed point in space, the field is said to be ______.

Answer 4

Linearly Polarized

Question 5

Composed of magnetic field(H) and electric field(E)

Answer 5

Transverse Electrmomagnetic Wave (TEM)

Question 6

The ____ of the TEM wave depends on the medium where it travels.

Answer 6

Velocity

Question 7

Number of cycles per second

Answer 7

Frequency

Question 8

The distance that the radio wave travels in one cycle

Answer 8

Wavelength

Question 9

refers to the physical orientation of the electric field on space

Answer 9

Polarization

Question 10

Types of Polarization

Answer 10

1. Linear
2. Circular
3. Elliptical
4. Random

Question 11

E field has a particular direction in space may it be horizontal or vertical

Answer 11

Linear Polarization

Question 12

E field is rotating about the axis of the direction of propagation

Answer 12

Circular polarization

Question 13

Similar to circular polarization but E and H are not equal

Answer 13

Elliptical polarization

Question 14

Polarization with no fixed pattern

Answer 14

Random Polarization

Question 15

Line drawn along the direction of propagation of the wave

Answer 15

Ray

Question 16

Surface of constant phase of the wave

Answer 16

Wavefront

Question 16

ratio between electric field intensity and magnetic field intensity.

Answer 16

Intrinsic Characteristic Impedance

Question 17

rate at which energy flows through a unit area of surface in space

Answer 17

Power Density

Question 17

states that power density is inversely proportional to the square of the distance from the source

Answer 17

Inverse Square Law

Question 18

The amount of voltage that will be induced by an electromagnetic wave at a specific location

Answer 18

Electric Field Intensity or Field Strength

Question 19

The ratio of the speed of radio wave in free space to the speed of radio wave in specific medium

Answer 19

Index of Refraction

Question 20

Bending of radio wave as it passes at a medium

Answer 20

Refraction

Question 21

An incident wave strikes the boundary of two media and some or all of the incident power does not enter the second material

Answer 21

Reflection

Question 22

Types of reflection

Answer 22

1. Diffuse Reflection
2. Specular Reflection
3. Rayleigh Criterion

Question 23

Redistribution of energy within a wavefront

Answer 23

Diffraction

Question 24

When two waves that left one source and travelled by different paths arrive at a point

Answer 24

Interference

Question 25

Modes of Wave Propagation

Answer 25

1. Ground/Surface wave propagation 2. Sky wave propagation 3. Space wave/ LOS propagation

Question 26

travels over the surface of the earth

Answer 26

Ground wave Propagation

Question 27

- Aka ionospheric propagation - sky waves strike the ionosphere and is reflected back to the ground

Answer 27

Sky wave propagation

Question 28

layers of the atmosphere

Answer 28

1.Troposphere 2. Stratosphere 3. Ionosphere

Question 29

Lowest layer and is 8-10 miles above sea level

Answer 29

Troposphere

Question 30

Also called as isothermal region because of its constant temperature

Answer 30

Stratosphere

Question 31

Ionized layer and low-density gas are found

Answer 31

ionosphere

Question 32

Layers of the Ionosphere

Answer 32

1. D - Layer 2. E - Layer 3. F - Layer

Question 33

-Lowest layer of the ionosphere - 30 -55 miles above the earth - ionization begins at sunrise, peaks at local noon and ends at sundown

Answer 33

D-Layer

Question 34

- 55-90 miles above the earth -Aids MF -ionization peaks at noon -aka Kennelly-Heaviside layer

Answer 34

E-layer

Question 35

- 90-240 miles above the Earth - divided into two layers during daytime (F1 and F2)

Answer 35

F-Layer

Question 36

Highest frequency that will be returned down to earth when beamed vertically upward

Answer 36

Critical frequency

Question 37

Highest frequency that will returned down to earth at a given distance at a specific angle

Answer 37

Maximum Usable Frequency (MUF)

Question 38

Frequency that gives the most consistent communication

Answer 38

Optimum Working Frequency (OWF)

Question 39

apparent height of the ionized layer

Answer 39

Virtual Height

Question 40

area that is between the outer limit of the ground wave range and the inner edge of the energy of return from the ionosphere

Answer 40

Skip zone

Question 41

Distance between the originating site and the beginning of the atmospheric return

Answer 41

Skip distance

Question 42

- Aka Line of Sight propagation

Answer 42

Space Wave propagation

Question 43

refers to the boundary line beyond which direct rays of the radio waves cannot be propagated over the earth's surface

Answer 43

Radio horizon