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Ham Radio Technician > Technician T4 and T5 Test Questions > Flashcards

Technician T4 and T5 Test Questions Flashcards

1
Q

Which of the following is an appropriate power supply rating for a typical 50 watt output mobile FM transceiver? T4A01

A

13.8 volts at 12 amperes
5-16

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2
Q

Which of the following should be considered when selecting an accessory SWR meter? T4A02

A

The frequency and power level at which the measurements will be made
4-10

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3
Q

Why are short, heavy-gauge wires used for a transceiver’s DC power connection? T4A03

A

To minimize voltage drop when transmitting
5-17

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4
Q

How are the transceiver audio input and output connected in a station configured to operate using FT8? T4A04

A

To the audio input and output of a computer running WSJT-X software
5-14

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5
Q

Where should an RF power meter be installed? T4A05

A

In the feed line, between the transmitter and antenna
4-18

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6
Q

What signals are used in a computer-radio interface for digital mode operation? T4A06

A

Receive audio, transmit audio, and transmitter keying
5-14

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7
Q

Which of the following connections is made between a computer and a transceiver to use computer software when operating digital modes? T4A07

A

Computer “line in” to transceiver speaker connection
5-14

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8
Q

Which of the following conductors is preferred for bonding at RF? T4A08

A

Flat copper strap
9-6

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9
Q

How can you determine the length of time that equipment can be powered from a batter? T4A09

A

Divide the battery ampere-hour rating by the average current draw of the equipment
5-17

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10
Q

What function is performed with a transceiver and a digital mode hot spot? T4A10

A

Communication using digital voice or data systems via the internet
6-13

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11
Q

Where should the negative power return of a mobile transceiver be connected in a vehicle? T4A11

A

At the 12 volt battery chassis ground
5-17

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12
Q

What is an electronic keyer? T4A12

A

A device that assists in manual sending of Morse Code
5-7

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13
Q

What is the effect of excessive microphone gain on SSB transmissions? T4B01

A

Distorted transmitted audio
5-8

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14
Q

Which of the following can be used to enter a transceiver’s operating frequency? T4B02

A

The keypad or VFO knob
5-5

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15
Q

How is squelch adjusted so that a weak FM signal can be heard? T4B03

A

Set the squelch threshold so that receiver output audio is on all the time
5-8

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16
Q

What is a way to enable quick access to a favorite frequency or channel on your transceiver? T4B04

A

Store it in a memory channel
5-5

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17
Q

What does the scanning function of an FM transceiver do? T4B05

A

Tunes through a range of frequencies to check for activity
6-10

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18
Q

Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low? T4B06

A

The RIT or Clarifier
5-9

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19
Q

What does a DMR “code plug” contain? T4B07

A

Access information for repeaters and talkgroups
6-13

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20
Q

What is the advantage of having multiple receive bandwidth choices on a multimode transceiver? T4B08

A

Permits noise or interference reduction by selecting a bandwidth matching the mode
5-9

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21
Q

How is a specific group of stations selected on a digital voice transceiver? T4B09

A

By entering the group’s identification code
6-13

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22
Q

Which of the following receiver filter bandwidths provides the best signal to noise ratio for SSB reception? T4B10

A

2400 Hz
5-9

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23
Q

Which of the following must be programmed into a D-STAR digital transceiver before transmitting? T4B11

A

Your call sign
6-13

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24
Q

What is the result of tuning an FM receiver above or below a signal’s frequency? T4B12

A

Distortion of the signal’s audio
5-9

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25
Q

Electrical current is measured in which of the following units? T5A01

A

Amperes
3-1

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26
Q

Electrical power is measured in which of the following units? T5A02

A

Watts
3-7

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27
Q

What is the name for the flow of electrons in an electric circuit? T5A03

A

Current
3-1

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28
Q

What are the units of electrical resistance? T5A04

A

Ohms
3-5

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29
Q

What is the electrical term for the force that causes electron flow? T5A05

A

Voltage
3-1

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30
Q

What is the unit of frequency? T5A06

A

Hertz
2-3

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31
Q

Why are metals generally good conductors of electricity? T5A07

A

They have many free electrons
3-5

32
Q

Which of the following is a good electrical insulator? T5A08

A

Glass
3-5

33
Q

Which of the following describes alternating current? T5A09

A

Current that alternates between positive and negative directions
3-1

34
Q

Which term describes the rate at which electrical energy is used? T5A10

A

Power
3-7

35
Q

What type of current flow is opposed by resistance? T5A11

A

Direct current
3-5

36
Q

What describes the number of times per second that an alternating current makes a complete cycle? T5A12

A

Frequency
2-3

37
Q

How many milliamperes is 1.5 amperes? T5B01

A

1500 milliamperes
2-2

38
Q

Which is equal to 1,500,000 hertz? T5B02

A

1500 kHz
2-2

39
Q

Which is equal to one kilovolt? T5B03

A

One thousand volts
2-2

40
Q

Which is equal to one microvolt? T5B04

A

One one-millionth of a volt
2-2

41
Q

Which is equal to 500 milliwatts? T5B05

A

0.5 watts
2-2

42
Q

Which is equal to 3000 milliamperes? T5B06

A

3 amperes
2-2

43
Q

Which is equal to 3.525 MHz? T5B07

A

3525 kHz
2-2

44
Q

Which is equal to 1,000,000 picofarads? T5B08

A

1 microfarad
2-2

45
Q

Which decibel value most closely represents a power increase from 5 watts to 10 watts? T5B09

A

3 dB
4-8

46
Q

Which decibel value most closely represents a power decrease from 12 watts to 3 watts? T5B10

A

-6 dB
4-8

47
Q

Which decibel value represents a power increase from 20 watts to 200 watts? T5B11

A

10 dB
4-8

48
Q

Which is equal to 28400 kHz? T5B12

A

28.400 MHz
2-2

49
Q

Which is equal to 2425 MHz? T5B13

A

2.425 GHz
2-2

50
Q

What describes the ability to store energy in an electric field? T5C01

A

Capacitance
3-8

51
Q

What is the unit of capacitance? T5C02

A

The farad
3-8

52
Q

What describes the ability to store energy in a magnetic field? T5C03

A

Inductance
3-8

53
Q

What is the unit of inductance? T5C04

A

The henry
3-8

54
Q

What is the unit of impedance? T5C05

A

The ohm
3-10

55
Q

What does the abbreviation “RF” mean? T5C06

A

Radio Frequency signals of all types
2-4

56
Q

What is the abbreviation for megahertz? T5C07

A

MHz
2-3

57
Q

What is the formula used to calculate electrical power (P) in a DC circuit? T5C08

A

P = I x E
3-7

58
Q

How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes? T5C09

A

138 watts
3-7

59
Q

How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes? T5C10

A

30 watts

60
Q

How much current is required to deliver 120 watts at a voltage of 12 volts DC? T5C11

A

10 amperes
3-7

61
Q

Whet is impedance? T5C12

A

The opposition to AC current flow
3-10

62
Q

What is the abbreviation for kilohertz? T5C13

A

kHz
2-3

63
Q

What formula is used to calculate current in a circuit? T5D01

A

I = E / R
3-5

64
Q

What formula is used to calculate voltage in a circuit? T5D02

A

E = I x R
3-5

65
Q

What formula is used to calculate resistance in a circuit? T5D03

A

R= E / I
3-5

66
Q

What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts? T5D04

A

30 ohms
3-6

67
Q

What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? T5C05

A

8 ohms
3-6

68
Q

What is the resistance of a circuit that draws 4 amperes from a 12 volt source? T5C06

A

3 ohms
3-6

69
Q

What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? T5D07

A

1.5 amperes
3-6

70
Q

What is the current through a 100-ohm resistor connected across 200 volts? T5D08

A

2 amperes
3-6

71
Q

What is the current through a 24-ohm resistor connected across 240 volts? T5D09

A

10 amperes
3-6

72
Q

What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? T5D10

A

1 volt
3-6

73
Q

What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? T5D11

A

10 volts
3-7

74
Q

What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? T5D12

A

20 volts
3-7

75
Q

In which type of circuit is DC current the same through all components? T5D13

A

Series
3-2

76
Q

In which type of circuit is voltage the same across all components? T5D14

A

Parallel
3-2

Ham Radio Technician (6 decks)

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