Which of the following causes failure of coaxial cables?

Rapid fluctuation in transmitter output power

Operation at 100% duty cycle for an extended period

Why should the outer jacket of coaxial cable be resistant to ultraviolet light?

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

Ultraviolet resistant jackets prevent harmonic radiation

Ultraviolet light can increase losses in the cable’s jacket

Ultraviolet and RF signals can mix, causing interference

What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types?

It requires special techniques to prevent moisture in the cable

It cannot be used for VHF or UHF antennas

It cannot be used at below freezing temperatures

Which of the following can damage a multimeter?

Attempting to measure voltage when using the resistance setting

Attempting to measure resistance using the voltage setting

Failing to connect one of the probes to ground

Not allowing it to warm up properly

What reading indicates that an ohmmeter is connected across a large, discharged capacitor?

Increasing resistance with time

Decreasing resistance with time

Alternating between open and short circuit

Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?

Ensure that the circuit is not powered

Ensure that the applied voltages are correct

Ensure that the circuit is grounded

Ensure that the circuit is operating at the correct frequency

T7_Practical_Circuits_part_2

Authored by Lawrence Feth

Specialty

9th - 12th Grade

Used 2+ times

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21 questions

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MULTIPLE CHOICE QUESTION

10 mins • 1 pt

What is the primary purpose of a dummy load?

To prevent transmitting signals over the air when making tests

To prevent over-modulation of a transmitter

To improve the efficiency of an antenna

To improve the signal-to-noise ratio of a receiver

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

Which of the following is used to determine if an antenna is resonant at the desired operating frequency?

A VTVM

An antenna analyzer

A Q meter

A frequency counter

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

What does a dummy load consist of?

A high-gain amplifier and a TR switch

A non-inductive resistor mounted on a heat sink

A low-voltage power supply and a DC relay

A 50-ohm reactance used to terminate a transmission line

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?

2 days, 2:50:00

Zero

1:1

Full Scale

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?

To protect the output amplifier transistors

To comply with FCC rules on spectral purity

Because power supplies cannot supply enough current at high SWR

To lower the SWR on the transmission line

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

What does an SWR reading of 4:1 indicate?

Loss of -4 dB

Good impedance match

Gain of +4 dB

Impedance mismatch

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

What happens to power lost in a feed line?

It increases the SWR

It is radiated as harmonics

It is converted into heat

It distorts the signal

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T7_Practical_Circuits_part_2

What is the primary purpose of a dummy load?

Which of the following is used to determine if an antenna is resonant at the desired operating frequency?

What does a dummy load consist of?

What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?

Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?

What does an SWR reading of 4:1 indicate?

What happens to power lost in a feed line?

Which instrument can be used to determine SWR?

Which of the following causes failure of coaxial cables?

Why should the outer jacket of coaxial cable be resistant to ultraviolet light?

Access all questions and much more by creating a free account

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Popular Resources on Wayground

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