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Ham Radio Technician > Technician Test T8 to T0 questions > Flashcards

Technician Test T8 to T0 questions Flashcards

1
Q

Which of the following is a form of amplitude modulation? T8A01

A

Single sideband
5-3

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2
Q

What type of modulation is commonly used for VHF packet radio transmissions? T8A02

A

FM or PM
5-4

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3
Q

Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands? T8A03

A

SSB
5-4

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4
Q

Which type of modulation is commonly used for VHF and UHF voice repeaters? T8A04

A

FM or PM
5-4

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5
Q

Which of the following types of signal has the narrowest bandwidth? T8A05

A

CW
5-4

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6
Q

Which sideband is normally used for 10 meter HF, VHF, and UHF single-sideband communications? T8A06

A

Upper sideband
5-4

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7
Q

What is a characteristic of single sideband (SSB) compared to FM? T8A07

A

SSB signals have narrower bandwidth
5-4

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8
Q

What is the approximate bandwidth of a typical single sideband (SSB) voice signal? T8A08

A

3 kHz
5-4

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9
Q

What is the approximate bandwidth of a VHF repeater FM voice signal? T8A09

A

Between 10 and 15 kHz
5-4

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10
Q

What is the approximate bandwidth of AM fast-scan TV transmissions? T8A10

A

About 6 MHz
5-4

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11
Q

What is the approximate bandwidth required to transmit a CW signal? T8A11

A

150 Hz
5-4

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12
Q

Which of the following is a disadvantage of FM compared with single sideband? T8A12

A

Only one signal can be received at a time
5-4

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13
Q

What telemetry information is typically transmitted by satellite beacons? T8B01

A

Health and status of the satellite
6-24

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14
Q

What is the impact of using excessive effective radiated power on a satellite uplink? T8B02

A

Blocking access by other users

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15
Q

Which of the following are provided by satellite tracking programs? T8B03

A

All these choices are correct
-Maps showing the real-time position of the satellite track over earth
-The time, azimuth, and elevation of the start, maximum altitude and end of a pass
-The apparent frequency of the satellite transmission, including effects of Doppler shift
6-24

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16
Q

What mode of transmission is commonly used by amateur radio satellites? T8B04

A

All these choices are correct
-SSB
-FM
-CW/data
6-24

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17
Q

What is a satellite beacon? T8B05

A

A transmission from a satellite that contains status information
6-23

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18
Q

Which of the following are inputs to a satellite tracking program? T8B06

A

The Keplerian elements
6-24

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19
Q

What is Doppler shift in reference to satellite communications? T8B07

A

An observed change in signal frequency caused by relative motion between the satellite and Earth station
6-23

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20
Q

What is meant by the statement that a satellite is operating in U/V mode? T8B08

A

The satellite uplink is in the 70 centimeter band and the downlink is in the 2 meter band
6-24

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21
Q

What causes spin fading of satellite signals? T8B09

A

Rotation of the satellite and its antennas
6-23

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22
Q

What is a LEO satellite? T8B10

A

A satellite in low earth orbit
6-23

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23
Q

Who may receive telemetry from a space station? T8B11

A

Anyone
6-24

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24
Q

Which of the following is a way to determine whether your satellite uplink power is neither too low nor too high? T8B12

A

Your signal strength on the downlink should be about the same as the beacon
6-24

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25
Q

Which of the following methods is used to locate sources of noise interference or jamming? T8C01

A

Radio direction finding
6-10

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26
Q

Which of these items would be useful for a hidden transmitter hunt? T8C02

A

A directional antenna
6-10

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27
Q

What operating activity involves contacting as many stations as possible during a specific period? T8C03

A

Contesting
6-7

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28
Q

Which of the following is good procedure when contacting another station in a contest? T8C04

A

Send only the minimum information needed for proper identification and the contest exchange
6-7

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29
Q

What is a grid locator? T8C05

A

A letter-number designator assigned to a geographic location
6-8

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30
Q

How is over the air access to IRLP nodes accomplished? T8C06

A

By using DTMF signals
6-13

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31
Q

What is Voice Over Internet Protocol (VoIP)? T8C07

A

A method of delivering voice communications over the internet using digital techniques
6-13

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32
Q

What is the Internet Radio Linking Project (IRLP)? T8C08

A

A technique to connect amateur radio systems, such as repeaters, via the internet using VoIP
6-13

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33
Q

Which of the following protocols enables an amateur station to transmit through a repeater without using a radio to initiate the transmission? T8C09

A

EchoLink
6-13

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34
Q

What is required before using EchoLink system? T8C10

A

Register your call sign and provide proof of license
6-13

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35
Q

What is an amateur radio station that connects other amateur stations to the internet? T8C11

A

A gateway
5-15

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36
Q

Which of the following is a digital communications mode? T8D01

A

All these choices are correct
-Packet radio
-IEEE 802.11
-FT8
5-11

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37
Q

What is a Talkgroup on a DMR repeater? T8D02

A

A way for groups of users to share a channel at different times without hearing other users on the channel
6-14

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38
Q

What kind of data can be transmitted by APRS? T8D03

A

All these choices are correct
-GPS position data
-Text messages
-Weather data
5-13

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39
Q

What type of transmission is indicated by the term “NTSC”? T8D04

A

An analog fast-scan color TV signal
6-9

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40
Q

Which of the following is an application of APRS? T8D05

A

Providing real-time tactical digital communications in conjunction with a map showing the locations of stations
5-13

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41
Q

What does the abbreviation “PSK” mean? T8D06

A

Phase Shift Keying
5-13

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42
Q

Which of the following describes DMR? T8D07

A

A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel
6-14

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43
Q

Which of the following is included in packet radio transmissions? T8D08

A

All these choices are correct
-A check sum that permits error detection
-A header that contains the call sign of the station to which the information is being sent
-Automatic repeat request in case of error
5-12

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44
Q

What is CW? T8D09

A

Another name for Morse code transmission
5-2

45
Q

Which of the following operating activities is supported by digital mode software in the WSJT-X software suite? T8D10

A

All these choices are correct
- Earth-Moon-Earth
-Weak signal propagation beacons
-Meteor scatter
5-12

46
Q

What is an ARQ transmission system? T8D11

A

An error correction method in which the receiving station detects errors and sends a request for retransmission
5-12

47
Q

Which of the following best describes an amateur radio mesh network? T8D12

A

An amateur-radio based data network using commercial Wi-Fi equipment with modified firmware
5-12

48
Q

What is FT8? T8D13

A

A digital mode capable of low signal-to-noise operation
5-12

49
Q

What is a beam antenna? T9A01

A

An antenna that concentrates signals in one direction
4-15

50
Q

Which of the following describes a type of antenna loading? T9A02

A

Electrically lengthening by inserting inductors in radiating elements
4-12

51
Q

Which of the following describes a simple dipole oriented parallel to Earth’s surface? T9A03

A

A horizontally polarized antenna
4-12

52
Q

What is a disadvantage of the short, flexible antenna supplied with most handheld radio transceivers, compared to full-sized quarter-wave antenna? T9A04

A

It has low efficiency
4-12

53
Q

Which of the following increases the resonant frequency of a dipole antenna? T9A05

A

Shortening it
4-12

54
Q

Which of the following types of antenna offers the greatest gain? T9A06

A

Yagi
4–15

55
Q

What is a disadvantage of using a handheld VHF transceiver with a flexible antenna inside a vehicle? T9A07

A

Signal strength is reduced due to the shielding effect of the vehicle
4-12

56
Q

What is the approximate length, in inches, of a quarter-wavelength vertical antenna for 146 MHz? T9A08

A

19
4-12

57
Q

What is the approximate length, in inches, of a half wavelength 6 meter dipole antenna? T9A09

A

112
4-12

58
Q

In which direction does a half-wave dipole antenna radiate the strongest signal? T9A10

A

Broadside to the antenna
4-12

59
Q

What is antenna gain? T9A11

A

The increase in signal strength in a specified direction compared to a reference antenna
4-7

60
Q

What is an advantage of a 5/8 wavelength whip antenna for VHF or UHF mobile service? T9A12

A

It has more gain than a 1/4 wavelength antenna
4-12

61
Q

What is a benefit of low SWR? T9B01

A

Reduced signal loss
4-10

62
Q

What is the most common impedance of coaxial cables used in amateur radio? T9B02

A

50 ohms
4-9

63
Q

Why is coaxial cable the most common feed line for amateur radio antenna systems? T9B03

A

It is easy to use and requires few special installation considerations
4-9

64
Q

What is the major function of an antenna tuner (antenna coupler)? T9B04

A

It matches the antenna system impedance to the transceiver’s output impedance
4-18

65
Q

What happens as the frequency of a signal in coaxial cable is increased? T9B05

A

The loss increases
4-9

66
Q

Which of the following RF connector types is most suitable for frequencies above 400 MHz? T9B06

A

Type N

67
Q

Which of the following is true of PL-259 type coax connectors? T9B07

A

They are commonly used at HF and VHF frequencies
4-17

68
Q

Which of the following is a source of loss in coaxial feed line? T9B08

A

All these choices are correct
-Water intrusion into coaxial connectors
-High SWR
-Multiple connectors in the line
4-17

69
Q

What can cause erratic changes in SWR? T9B09

A

Loose connection in the antenna or feed line
4-10

70
Q

What is the electrical difference between Rg-58 and RG-213 coaxial cable? T9B10

A

RG213 cable has less loss at a given frequency
4-17

71
Q

Which of the following types of feed line has the lowest loss at VHF and UHF? T9B11

A

Air-insulated hardline
4-17

72
Q

What is standing wave ratio (SWR)? T9B12

A

A measure of how well a load is matched to a transmission line
4-9

73
Q

Which of the following is a safety hazard of 12-volt storage batter? T0A01

A

Shorting the terminals can cause burns, fire or an explosion
9-2

74
Q

What health hazard is presented by electrical current flowing through the body? T0A02

A

All these choices are correct
-It may cause injury by heating tissue
-It may disrupt the electrical functions of cells
-It may cause involuntary muscle contractions
9-2

75
Q

In the United State, what circuit does black wire insulation indicate in a three-wire 120 V cable? T0A03

A

Hot
9-4

76
Q

What is the purpose of a fuse in an electrical circuit? T0A04

A

To remove power in case of overload
3-12

77
Q

Why should a 5-ampere fuse never be replaced with a 20-ampere fuse? T0A05

A

Excessive current could cause a fire
3-12

78
Q

What is a good way to guard against electrical shock at your station? T0A06

A

All these choices are correct
-Use three wire cords and plugs for all AC powered equipment
-Connect all AC powered station equipment to a common safety ground
Install mechanical interlocks in high voltage circuits
9-4

79
Q

Where should a lightning arrester be installed in a coaxial feed line? T0A07

A

On a ground panel near where feed lines enter the building
9-5

80
Q

Where should a fuse or circuit breaker be installed in a 120V AC power circuit? T0A08

A

In series with the hot conductor only
9-4

81
Q

What should be done to all external ground rods or earth connections? T0A09

A

Bond them together with heavy wire or conductive strap
9-5

82
Q

What hazard is caused by charging or discharging a battery too quickly? T0A10

A

Overheating or out-gassing
5-17

83
Q

What hazard exists in a power supply immediately after turning it off? T0A11

A

Charge stored in filter capacitors
9-2

84
Q

Which of the following precautions should be taken when measuring high voltages with a voltmeter? T0A12

A

Ensure that the voltmeter and leads are rated for use at the voltages to be measured
3-4

85
Q

Which of the following is good practice when installing ground wires on a tower for lightning protection? T0B01

A

Ensure that connections are short and direct
9-5

86
Q

What is required when climbing an antenna tower? T0B02

A

All these choices are correct
-Have sufficient training on safe tower climbing techniques
-Use appropriate tie-off to the tower at all times
-Always wear an approved climbing harness
9-19

87
Q

Under what circumstances is it safe to climb a tower without a helper or observer? T0B03

A

Never
9-19

88
Q

Which of the following is an important safety precaution to observe when putting up an antenna tower? T0B04

A

Look for and stay clear of any overhead electrical wires
9-17

89
Q

What is the purpose of a safety wire through a turnbuckle used to tension guy lines? T0B05

A

Prevent loosening of the turnbuckle from vibration
9-17

90
Q

What is the minimum safe distance from a power line to allow when installing an antenna? T0B06

A

Enough so that if the antenna falls, no part of it can come closer than 10 feet to the power wires
9-17

91
Q

Which of the following is an important safety rule to remember when using a crank-up tower? T0B07

A

This type of tower must not be climbed unless it is retracted, or mechanical safety locking devices have been installed
9-19

92
Q

Which is a proper grounding method for a tower? T0B08

A

Separate eight foot ground rods for each tower leg, bonded to the tower and each other
9-17

93
Q

Why should you avoid attaching an antenna to a utility pole? T0B09

A

The antenna could contact high-voltage power lines
9-17

94
Q

Which of the following is true when installing grounding conductors used for lightning protection? T0B10

A

Sharp bends must be avoided
9-5

95
Q

Which of the following establishes grounding requirements for an amateur radio tower or antenna? T0B11

A

Local electrical codes
9-5

96
Q

What type of radiation are radio signals? T0C01

A

Non-ionizing radiation
9-11

97
Q

At which of the following frequencies does maximum permissible exposure have the lowest value? T0C02

A

50 MHz
9-12

98
Q

How does the allowable power density for RF safely change if duty cycle changes from 100 percent to 50 percent? T0C03

A

It increases by a factor of 2
9-13

99
Q

What factors affect the RF exposure of people near an amateur station antenna? T0C04

A

All these choices are correct
-Frequency and power level of the RF field
-Distance from the antenna to a person
-Radiation pattern of the antenna
9-14

100
Q

Why do exposure limits vary with frequency? T0C05

A

The human body absorbs more RF energy at some frequencies than others
9-11

101
Q

Which of the following is an acceptable method to determine whether your station complies with FCC RF exposure regulations? T0C06

A

All these choices are correct
-By calculation based on FCC OET Bulletin 65
-By calculation based on computer modeling
-By measurement of field strength using calibrated equipment
9-14

102
Q

What hazard is created by touching an antenna during a transmission? T0C07

A

RF burn to skin
9-11

103
Q

Which of the following actions can reduce exposure to RF radiation? T0C08

A

Relocate antennas
9-11

104
Q

How can you make sure your station stays in compliance with RF safety regulations? T0C09

A

By re-evaluating the station whenever an item in the transmitter or antenna system is changed
9-14

105
Q

Why is duty cycle one of the factors used to determine safe RF radiation exposure levels? T0C10

A

It affects the average exposure to radiation
9-13

106
Q

What is the definition of duty cycle during the averaging time for RF exposure? T0C11

A

The percentage of time that a transmitter is transmitting
9-13

107
Q

How does RF radiation differ from ionizing radiation (radioactivity)? T0C12

A

RF radiation does not have sufficient energy to cause chemical changes in cells and damage DNA
9-11

108
Q

Who is responsible for ensuring that no person is exposed to RF energy above the FCC exposure limits? T0C13

A

The station licensee
9-11

Ham Radio Technician (6 decks)

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