Part 1

Question 1

Defined as the path of carrying altrrnating electrical energy from source to load

Answer 1

Transmission line

Question 2

A device designed to guide electrical energy from one point to another. It is used to transfer the output RF energy of a transmitter to an antenna with the least possible power loss

Answer 2

Transmission line

Question 3

Two ends of transmission lines

Answer 3

Input end and output end

Question 4

the end of a two wire transmission line connected to a source

Answer 4

Input end or the generator end

Question 5

Other end of the transmission line connected to the antenna

Answer 5

Output end or receiving end

Question 6

Ratio of voltage to current at the input end. The impedance presented to the transmitter by the transmission line and its
Load, antenna

Answer 6

Input Impedance

Question 7

ratio of voltage to current at the output (Eout/Iout) end. Impedance presented to the load by the transmission line and its source.

Answer 7

Output impedance

Question 8

Types of Transmission Mediums

Answer 8

Parallel-line
Coaxial line
Shielded Pair
Twisted Pair
Waveguides

Question 9

Two wires that aregenerally spaced from 2 to 6 inches apart by insulating spacers

Answer 9

Two Wire-Open Line, Parallel line

Question 10

most often used for power lines, rural telephone lines, and telegraph
lines. It is sometimes used as a transmission line between a transmitter and an antenna or
between an antenna and a receiver

Answer 10

Two Wire OpenLine, Parallel line

Question 11

Advantages:

simple construction
high radiation losses
electrical noise pickup because of the lack of shielding

Answer 11

Two Wire Open Lin, Parallel line

Question 12

This type of transmission line is commonly used to connect a television receiving antenna to
a home television set.

Answer 12

Two-wire Ribbon (Twin Lead), Parallel Line

Question 13

uniform spacing is
assured by embedding the two wires in a low-loss dielectric, usually polyethylene.

Answer 13

Two Wire Ribbon (Twin Lead), Parallel Line

Question 14

two insulated wires twisted together to form a flexible line without
the use of spacers.

Answer 14

Twisted Pair

Question 15

not used for transmitting high frequency because of the high dielectric losses that
occur in the rubber insulation.
When the line is wet, the losses increase greatly.

Answer 15

Twisted Pair

Question 16

100 ohm copper cable that consists of 2 to 1800 pairs of wires surrounded by an outer jacket.

Answer 16

Unshielded Twisted Pair (UTP)

Question 17

No metallic shield

makes the cable small in diameter but unprotected against electrical
interference.

Twist helps to improve its immunity to electrical noise and EM

Answer 17

Unshielded Twisted Pair (UTP)

Question 18

offers a steady network tailor-made for data transfer
and telephony

Answer 18

Twisted pair of cabling in UTP cable

Question 19

Inside a shield twisted pair cable, there are ______ surrounded by a protective plastic cover.

Answer 19

4 twisted pairs of copper wires

Question 20

The greater the number of twisted pairs corresponds to what?

Answer 20

More bandwidth

Question 21

Color coding for UTP Cable in North America

Answer 21

Blue
Orange
Green
Brown
Slate or gray

Question 22

Invented the twisted pair of cabling in 1881

Answer 22

Alexander Graham Bell

Question 23

-Used for Telephone wiring
-Transfers up to 1 Mbps of data
-voice grade
-750kHz

Answer 23

CAT 1

Question 24

-support digital voice and data communication
-voice grade
-transfers up to 4 Mbps
-1MHz

Answer 24

CAT 2

Question 25

-used for Token Ring and 10BASE-T Ethernet applications -transfers up to 10 MBPS of data. -16 MHz

Answer 25

CAT 3

Question 26

-have four pairs of UTP copper cables used for Token ring networks. -transfers up to 16 MBPS of data. -20MHz

Answer 26

CAT4

Question 27

-used in structured cabling for Ethernet, Token ring, and Fast Ethernet connections. -transfers up to 100 MBPS data. -100MHz

Answer 27

CAT5

Question 28

- very popular and used in Ethernet, Gigabit Ethernet, and Fast Ethernet connection - transfers up to 1 GBPS data - 100 MHz

Answer 28

CAT 5e

Question 29

high-grade UTP cables used for Gigabit Ethernet and 10 Ethernet (55m) connections -transfers up to 10 GBPS data -250MHz

Answer 29

CAT 6

Question 30

-used for Gigabit Ethernet and 10 Ethernet (55m). - It transfers up to 10 GBPS data. - 500 MHz

Answer 30

CAT 6a

Question 31

-top graded UTP cables used for Gigabit Ethernet and 10 Ethernet (100m). -It transfers nearly 10 GBPS data. -600MHz

Answer 31

CAT 7

Question 32

Consists of parallel conductors separated from each other and surrounded by a solid dielectric. The conductors are contained within a braided copper tubing that acts as an electrical shield.

Answer 32

Shielded Pair

Question 33

assembly is covered with a rubber or flexible composition coating that protects the line from moisture and mechanical damage.

Answer 33

Shielded Pair

Question 34

The principal advantage is that the conductors are balanced to ground; that is, the capacitance between the wires is uniform throughout the length of the line.

Answer 34

Shieldedpair

Question 35

consists of a central, insulated wire (inner conductor) mounted inside a tubular outer conductor

Answer 35

Rigid air coaxial line

Question 36

The inner conductor is insulated from the outer conductor by __________ at regular intervals. The spacers are made of __________, or some other material that has good insulating characteristics and low dielectric losses at high frequencies.

Answer 36

insulating spacers or beads (1st blank) Pyrex, polystyrene (2nd blank)

Question 37

The chief advantage of the rigid line is its ability to

Answer 37

minimize radiation losses.

Question 38

Made with an inner conductor that consists of flexible wire insulated from the outer conductor by a solid, continuous insulating material.

Answer 38

Flexible or Solid Coaxial Lines

Question 39

Because of the high-frequency losses associated with rubber insulators, _________________ was developed to replace rubber and eliminate these losses.

Answer 39

polyethylene plastic

Question 40

solid substance that remains flexible over a wide range of temperatures. unaffected by seawater, gasoline, oil, and most other liquids that may be found aboard ship.

Answer 40

polyethylene plastic

Question 41

use of polyethylene as an insulator results in ____________________________________ than the use of air as an insulator. However, these losses are still lower than the losses associated with most other solid dielectric materials.

Answer 41

greater high-frequency losses

Question 42

classified as a transmission line.

Answer 42

waveguides

Question 43

cylindrical, elliptical, or rectangular (cylindrical and rectangular shapes) the rectangular one used more frequently than the cylindrical one.

Answer 43

waveguides

Question 44

The electrical signal in a coaxial line is carried by the center conductor with respect to the grounded outer conductor.

Answer 44

Unbalanced Line

Question 45

The operation with the other types (two-wire, twisted pair, shielded pair) is usually done with with this line The same current flows in each wire but 180 degrees out of phase.

Answer 45

Balanced Line

Question 46

When signals that are 180 degrees out of phase cancel each other. Practical ratio figures are 40-70 dB. In other words, the undesired noise or signal picked up by a two-wire balanced line is attenuated by 40-70dB.

Answer 46

Common Mode Rejection (CMR)

Question 47

Circuits that convert between balanced and unbalanced operation are called

Answer 47

Baluns

Question 48

derived by combining the words “balanced” and “unbalanced. variety of transformers used to convert unbalanced signals into balanced ones (or vice versa).

Answer 48

Baluns

Question 49

Baluns ________________ and provide a balanced output

Answer 49

isolate transmission line