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HAM Technician class > Ham Tech Class - Sets 4 & 5 > Flashcards

Ham Tech Class - Sets 4 & 5 Flashcards

1
Q

What must be considered to determine the minimum current capacity needed for a transceiver power supply?

A

D. All of these choices are correct (A. Efficiency of the transmitter at full power output, B. Receiver and control circuit power, C. Power supply regulation and heat dissipation) - T4A01 (D)

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2
Q

How might a computer be used as part of an amateur radio station?

A

D. All of these choices are correct (A. For logging contacts and contact information, B. For sending and/or receiving CW, C. For generating and decoding digital signals) - T4A02 (D)

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3
Q

Why should wiring between the power source and radio be heavy-gauge wire and kept as short as possible?

A

A. To avoid voltage falling below that needed for proper operation - T4A03 (A)

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4
Q

Which computer sound card port is connected to a transceiver’s headphone or speaker output for operating digital modes?

A

C. Microphone or line input - T4A04 (C)

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5
Q

What is the proper location for an external SWR meter?

A

A. In series with the feed line, between the transmitter and antenna - T4A05 (A)

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6
Q

Which of the following connections might be used between a voice transceiver and a computer for digital operation?

A

C. Receive audio, transmit audio, and push-to-talk (PTT) - T4A06 (C)

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7
Q

How is a computer’s sound card used when conducting digital communications?

A

C. The sound card provides audio to the radio’s microphone input and converts received audio to digital form - T4A07 (C)

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8
Q

Which of the following conductors provides the lowest impedance to RF signals?

A

D. Flat strap - T4A08 (D)

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9
Q

Which of the following could you use to cure distorted audio caused by RF current on the shield of a microphone cable?

A

D. Ferrite choke - T4A09 (D)

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10
Q

What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio?

A

B. The alternator - T4A10 (B)

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11
Q

Where should the negative return connection of a mobile transceiver’s power cable be connected?

A

A. At the battery or engine block ground strap - T4A11 (A)

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12
Q

What may happen if a transmitter is operated with the microphone gain set too high?

A

B. The output signal might become distorted - T4B01 (B)

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13
Q

Which of the following can be used to enter the operating frequency on a modern transceiver?

A

A. The keypad or VFO knob - T4B02 (A)

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14
Q

What is the purpose of the squelch control on a transceiver?

A

D. To mute receiver output noise when no signal is being received - T4B03 (D)

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15
Q

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

A

B. Store the frequency in a memory channel - T4B04 (B)

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16
Q

Which of the following would reduce ignition interference to a receiver?

A

C. Turn on the noise blanker - T4B05 (C)

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17
Q

Which of the following controls could be used if the voice pitch of a single-sideband signal seems too high or low?

A

D. The receiver RIT or clarifier - T4B06 (D)

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18
Q

What does the term “RIT” mean?

A

B. Receiver Incremental Tuning - T4B07 (B)

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19
Q

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

A

B. Permits noise or interference reduction by selecting a bandwidth matching the mode - T4B08 (B)

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20
Q

Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for SSB reception?

A

C. 2400 Hz - T4B09 (C)

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21
Q

Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for CW reception?

A

A. 500 Hz - T4B10 (A)

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22
Q

What is the function of automatic gain control, or AGC?

A

A. To keep received audio relatively constant - T4B11 (A)

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23
Q

Which of the following could be used to remove power line noise or ignition noise?

A

B. Noise blanker - T4B12 (B)

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24
Q

Which of the following is a use for the scanning function of an FM transceiver?

A

C. To scan through a range of frequencies to check for activity - T4B13 (C)

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25
Q

Electrical current is measured in which of the following units?

A

D. Amperes - T5A01 (D)

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26
Q

Electrical power is measured in which of the following units?

A

B. Watts - T5A02 (B)

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27
Q

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

A

D. Current - T5A03 (D)

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28
Q

What is the name for a current that flows only in one direction?

A

B. Direct current - T5A04 (B)

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29
Q

What is the electrical term for the electromotive force (EMF) that causes electron flow?

A

A. Voltage - T5A05 (A)

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30
Q

How much voltage does a mobile transceiver typically require?

A

A. About 12 volts - T5A06 (A)

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31
Q

Which of the following is a good electrical conductor?

A

C. Copper - T5A07 (C)

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32
Q

Which of the following is a good electrical insulator?

A

B. Glass - T5A08 (B)

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33
Q

What is the name for a current that reverses direction on a regular basis?

A

A. Alternating current - T5A09 (A)

34
Q

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

A

C. Power - T5A10 (C)

35
Q

What is the unit of electromotive force?

A

A. The volt - T5A11 (A)

36
Q

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

A

D. Frequency - T5A12 (D)

37
Q

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

A

A. Series - T5A13 (A)

38
Q

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

A

B. Parallel - T5A14 (B)

39
Q

How many milliamperes is 1.5 amperes?

A

C. 1500 milliamperes - T5B01 (C)

40
Q

What is another way to specify a radio signal frequency of 1,500,000 hertz?

A

A. 1500 kHz - T5B02 (A)

41
Q

How many volts are equal to one kilovolt?

A

C. One thousand volts - T5B03 (C)

42
Q

How many volts are equal to one microvolt?

A

A. One one-millionth of a volt - T5B04 (A)

43
Q

Which of the following is equal to 500 milliwatts?

A

B. 0.5 watts - T5B05 (B)

44
Q

If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?

A

C. 3 amperes - T5B06 (C)

45
Q

If a frequency display calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?

A

C. 3525 kHz - T5B07 (C)

46
Q

How many microfarads are equal to 1,000,000 picofarads?

A

B. 1 microfarad - T5B08 (B)

47
Q

What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?

A

B. 3 dB - T5B09 (B)

48
Q

What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?

A

C. -6 dB - T5B10 (C)

49
Q

What is the amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?

A

A. 10 dB - T5B11 (A)

50
Q

Which of the following frequencies is equal to 28,400 kHz?

A

A. 28.400 MHz - T5B12 (A)

51
Q

If a frequency display shows a reading of 2425 MHz, what frequency is that in GHz?

A

C. 2.425 GHz - T5B13 (C)

52
Q

What is the ability to store energy in an electric field called?

A

D. Capacitance - T5C01 (D)

53
Q

What is the basic unit of capacitance?

A

A. The farad - T5C02 (A)

54
Q

What is the ability to store energy in a magnetic field called?

A

D. Inductance - T5C03 (D)

55
Q

What is the basic unit of inductance?

A

C. The henry - T5C04 (C)

56
Q

What is the unit of frequency?

A

A. Hertz - T5C05 (A)

57
Q

What does the abbreviation “RF” refer to?

A

A. Radio frequency signals of all types - T5C06 (A)

58
Q

A radio wave is made up of what type of energy?

A

B. Electromagnetic - T5C07 (B)

59
Q

What is the formula used to calculate electrical power in a DC circuit?

A

A. Power (P) equals voltage (E) multiplied by current (I) - T5C08 (A)

60
Q

How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?

A

A. 138 watts - T5C09 (A)

61
Q

How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?

A

B. 30 watts - T5C10 (B)

62
Q

How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?

A

B. 10 amperes - T5C11 (B)

63
Q

What is impedance?

A

A. A measure of the opposition to AC current flow in a circuit - T5C12 (A)

64
Q

What is a unit of impedance?

A

D. Ohms - T5C13 (D)

65
Q

What is the proper abbreviation for megahertz?

A

D. MHz - T5C14 (D)

66
Q

What formula is used to calculate current in a circuit?

A

B. Current (I) equals voltage (E) divided by resistance (R) - T5D01 (B)

67
Q

What formula is used to calculate voltage in a circuit?

A

A. Voltage (E) equals current (I) multiplied by resistance (R) - T5D02 (A)

68
Q

What formula is used to calculate resistance in a circuit?

A

B. Resistance (R) equals voltage (E) divided by current (I) - T5D03 (B)

69
Q

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

A

B. 30 ohms - T5D04 (B)

70
Q

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

A

C. 8 ohms - T5D05 (C)

71
Q

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

A

A. 3 ohms - T5D06 (A)

72
Q

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

A

D. 1.5 amperes - T5D07 (D)

73
Q

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

A

C. 2 amperes - T5D08 (C)

74
Q

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

A

C. 10 amperes - T5D09 (C)

75
Q

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

A

A. 1 volt - T5D10 (A)

76
Q

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

A

B. 10 volts - T5D11 (B)

77
Q

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

A

D. 20 volts - T5D12 (D)

78
Q

What happens to current at the junction of two components in series?

A

B. It is unchanged - T5D13 (B)

79
Q

What happens to current at the junction of two components in parallel?

A

A. It divides between them dependent on the value of the components - T5D14 (A)

80
Q

What is the voltage across each of two components in series with a voltage source?

A

C. It is determined by the type and value of the components - T5D15 (C)

81
Q

What is the voltage across each of two components in parallel with a voltage source?

A

D. The same voltage as the source - T5D16 (D)

HAM Technician class (7 decks)

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