NAVEDTRA 14182A Ch4

Question 1

Which 2 basic classifications are most practical transmitting antennas devised into

Answer 1

Hertz

Marconi

Question 2

Which type of antennas operate with one end grounded and are mounted perpendicular to the earth or to a surface acting as a ground

Answer 2

Marconi

Question 3

Hertz antennas are generally used for frequency above what

Answer 3

2Mhz

MF

Question 4

Which 3 parts does a complete antenna consist of

Answer 4

Coupling device
Feeder
Antenna

Question 5

What is the interchangeability of the same antenna for transmitting and receiving known as

Answer 5

Reciprocity

Question 6

Which frequencies is sky wave transmission used

Answer 6

HF

3-30MHz

Question 7

Which type of polarization is used by VHF and UHF transmissions

Answer 7

Horizontal

Question 8

What is the useful part of the transmitted signal

Answer 8

Radiated energy

Question 9

What is a plot of the radiated energy from an antenna

Answer 9

Radiation pattern

Question 10

What is it known as when antenna sources radiate energy equally in all direction

Answer 10

Isotopic radiation

Question 11

Which type of radiators emit stronger radiation in one direction than another

Answer 11

Anisotropic

Question 12

What is used to indicate direction of minimum radiation

Answer 12

Null

Question 13

The electrical length of any antenna wire can be increased or decreased by what energy

Answer 13

Loading

Question 14

What is the basic unit from which many complex antennas are constructed

Answer 14

Half-wave antenna

Question 15

What term is used to indicate an antenna that is very short compared with the wave length of the operating frequency

Answer 15

Doublet