Intro to Fundamentals 2

Question 1

high frequency (HF)

Answer 1

3-30 MHz

Question 2

very high frequency (VHF)

Answer 2

30-300 MHz

Question 3

ultra high frequency (UHF)

Answer 3

300 MHz - 3 GHz

Question 4

super high frequency (SHF)

Answer 4

3-30 GHz

Question 5

human hearing range (audible range)

Answer 5

20 Hz - 20 KHz

Question 6

Modes of Communication

Answer 6

1. Simplex
2. Half-duplex
3. Full-duplex

Question 7

General safety rules

Answer 7

1) Don’t work tired
2) Don’t work in poor light
3) Don’t work in wet conditions
4) Don’t wear conductive jewelry
5) Never assume a circuit is dead, always verify
6) Buddy system
7) Don’t mess with safety devices
8) Keep tools clean and in working order
9) Discharge items, such as capacitors, before working on them
10) Don’t mess with safety grounds
11) One-hand rule
12) Use only approved fire extinguishers
13) Follow directions when using chemicals
14) Electronic components may contain hazardous materials
15) Use only approved/equivalent replacement parts
16) Plan, don’t rush

Question 8

Common connectors

Answer 8

1) Type N: < 11 GHz
2) Precision Type N: < 11 GHz; less loss than non-precision
3) Subminiature (SMA): < 18 GHz; less loss than non-precision; easily damaged
4) K (2.92mm): < 40 GHz; easily damaged
5) BNC: < 4 GHz

Question 9

Speed of sound

Answer 9

1) Air: 344 m/s or 1,129 ft/s
2) Fresh water: 1,480 m/s or 4,856 ft/s
3) Salt water: 1,520 m/s or 4,987 ft/s
4) Wood: 3,360 m/s or 10,991 ft/s
5) Concrete: 3,400 m/s or 11,555 ft/s
6) Steel: 5,050 m/s or 16,568 ft/s

Question 10

Sound Characteristics (on contact with a surface)

Answer 10

• Reflection
• Refraction
• Absorption

Question 11

Infrasonic/Subsonic

Answer 11

Mechanical energy that falls below [1-20 Hz] the human hearing range.

Question 12

Sonic

Answer 12

Human hearing range.

Question 13

Ultrasonic

Answer 13

Any frequency above the human hearing range.

Question 14

O-scope

Answer 14

Time domain

Question 15

Spectrum analyzer

Answer 15

Frequency Domain

Question 16

Speed of light

Answer 16

300,000,000 m/s

Question 17

FM Spectrum

Answer 17

88 MHz - 108 MHz

Question 18

Inverse Square Law

Answer 18

Signal falls 6 dB for every distance doubled, from the transmitter

Question 19

Configuration Transformers

Answer 19

1) Phase to phase = 208 or 240 V
2) Neutral to ground = 0 V
3) Phase to neutral = 120 V
4) Phase to ground = 120 V

Question 20

Branches on same phase

Answer 20

0 V

Question 21

Branches on different phase

Answer 21

208 or 240 V

Question 22

White wire

Answer 22

Neutral (CONUS)

Question 23

Green or bare copper wire

Answer 23

Ground (CONUS)

Question 24

Red, blue, black, or [sometimes] brown wire

Answer 24

Phase (CONUS)