SUBELEMENT T7 – Station equipment: common transmitter and receiver problems; antenna measurements; troubleshooting; basic repair and testing – [4 Exam Questions - 4 Groups]

Question 1

T7A01 (B)

Which term describes the ability of a receiver to detect the presence of a signal?

Answer 1

B. Sensitivity

Question 2

T7A02 (B)

What is a transceiver?

Answer 2

B. A unit combining the functions of a transmitter and a receiver

Question 3

T7A03 (B)

Which of the following is used to convert a radio signal from one frequency to another?

Answer 3

B. Mixer

Question 4

T7A04 (C)

Which term describes the ability of a receiver to discriminate between multiple signals?

Answer 4

C. Selectivity

Question 5

T7A05 (D)

What is the name of a circuit that generates a signal at a specific frequency?

Answer 5

D. Oscillator

Question 6

T7A06 (C)

What device converts the RF input and output of a transceiver to another band?

Answer 6

C. Transverter

Question 7

T7A07 (D)

What is meant by “PTT”?

Answer 7

D. The push-to-talk function that switches between receive and transmit

Question 8

T7A08 (C)

Which of the following describes combining speech with an RF carrier signal?

Answer 8

C. Modulation

Question 9

T7A09 (B)

What is the function of the SSB/CW-FM switch on a VHF power amplifier?

Answer 9

B. Set the amplifier for proper operation in the selected mode

Question 10

T7A10 (B)

What device increases the low-power output from a handheld transceiver?

Answer 10

B. An RF power amplifier

Question 11

T7A11 (A)

Where is an RF preamplifier installed?

Answer 11

A. Between the antenna and receiver

Question 12

T7B01 (D)

What can you do if you are told your FM handheld or mobile transceiver is over-deviating?

Answer 12

D. Talk farther away from the microphone

Question 13

T7B02 (A)

What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?

Answer 13

A. The receiver is unable to reject strong signals outside the AM or FM band

Question 14

T7B03 (D)

Which of the following can cause radio frequency interference?

Answer 14

A. Fundamental overload
B. Harmonics
C. Spurious emissions
D. All of these choices are correct

Question 15

T7B04 (D)

Which of the following is a way to reduce or eliminate interference from an amateur transmitter to a nearby telephone?

Answer 15

D. Put an RF filter on the telephone

Question 16

T7B05 (A)

How can overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?

Answer 16

A. Block the amateur signal with a filter at the antenna input of the affected receiver

Question 17

T7B06 (A)
Which of the following actions should you take if a neighbor tells you that your station’s transmissions are interfering with their radio or TV reception?

Answer 17

A. Make sure that your station is functioning properly and that it does not cause interference to your own radio or television when it is tuned to the same channel

Question 18

T7B07 (D)

Which of the following can reduce overload to a VHF transceiver from a nearby FM broadcast station?

Answer 18

D. Band-reject filter

Question 19

T7B08 (D)

What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?

Answer 19

A. Work with your neighbor to identify the offending device
B. Politely inform your neighbor about the rules that prohibit the use of devices that cause interference
C. Check your station and make sure it meets the standards of good amateur practice
D. All of these choices are correct

Question 20

T7B09 (A)

What is a Part 15 device?

Answer 20

A. An unlicensed device that may emit low-powered radio signals on frequencies used by a licensed service

Question 21

T7B10 (D)
What might be a problem if you receive a report that your audio signal through the repeater is distorted or unintelligible?

Answer 21

A. Your transmitter is slightly off frequency
B. Your batteries are running low
C. You are in a bad location
D. All of these choices are correct

Question 22

T7B11 (C)

What is a symptom of RF feedback in a transmitter or transceiver?

Answer 22

C. Reports of garbled, distorted, or unintelligible voice transmissions

Question 23

T7B12 (D)

What should be the first step to resolve cable TV interference from your ham radio transmission?

Answer 23

D. Be sure all TV coaxial connectors are installed properly

Question 24

T7C01 (A)

What is the primary purpose of a dummy load?

Answer 24

A. To prevent transmitting signals over the air when making tests

Question 25

T7C02 (B) Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?

Answer 25

B. An antenna analyzer

Question 26

T7C03 (A) | What, in general terms, is standing wave ratio (SWR)?

Answer 26

A. A measure of how well a load is matched to a transmission line

Question 27

T7C04 (C) | What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?

Answer 27

C. 1 to 1

Question 28

T7C05 (A) | Why do most solid-state amateur radio transmitters reduce output power as SWR increases?

Answer 28

A. To protect the output amplifier transistors

Question 29

T7C06 (D) | What does an SWR reading of 4:1 indicate?

Answer 29

D. Impedance mismatch

Question 30

T7C07 (C) | What happens to power lost in a feed line?

Answer 30

C. It is converted into heat

Question 31

T7C08 (D) | What instrument other than an SWR meter could you use to determine if a feed line and antenna are properly matched?

Answer 31

D. Directional wattmeter

Question 32

T7C09 (A) | Which of the following is the most common cause for failure of coaxial cables?

Answer 32

A. Moisture contamination

Question 33

T7C10 (D) | Why should the outer jacket of coaxial cable be resistant to ultraviolet light?

Answer 33

D. Ultraviolet light can damage the jacket and allow water to enter the cable

Question 34

T7C11 (C) | What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types?

Answer 34

C. It requires special techniques to prevent water absorption

Question 35

T7C12 (B) | What does a dummy load consist of?

Answer 35

B. A non-inductive resistor and a heat sink

Question 36

T7D01 (B) | Which instrument would you use to measure electric potential or electromotive force?

Answer 36

B. A voltmeter

Question 37

T7D02 (B) | What is the correct way to connect a voltmeter to a circuit?

Answer 37

B. In parallel with the circuit

Question 38

T7D03 (A) | How is a simple ammeter connected to a circuit?

Answer 38

A. In series with the circuit

Question 39

T7D04 (D) | Which instrument is used to measure electric current?

Answer 39

D. An ammeter

Question 40

T7D05 (D) | What instrument is used to measure resistance?

Answer 40

D. An ohmmeter

Question 41

T7D06 (C) | Which of the following might damage a multimeter?

Answer 41

C. Attempting to measure voltage when using the resistance setting

Question 42

T7D07 (D) | Which of the following measurements are commonly made using a multimeter?

Answer 42

D. Voltage and resistance

Question 43

T7D08 (C) | Which of the following types of solder is best for radio and electronic use?

Answer 43

C. Rosin-core solder

Question 44

T7D09 (C) | What is the characteristic appearance of a cold solder joint?

Answer 44

C. A grainy or dull surface

Question 45

T7D10 (B) What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?

Answer 45

B. The circuit contains a large capacitor

Question 46

T7D11 (B) | Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?

Answer 46

B. Ensure that the circuit is not powered

Question 47

T7D12 (B) | Which of the following precautions should be taken when measuring high voltages with a voltmeter?

Answer 47

B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured