HAM FREE Ham Radio Extra Class General Questions and Answers 3

Question 1

What is the approximate noise figure of a well-designed preamplifier used for weak-signal VHF work?

Accepted Answer

0.5 dB

Answer

6 dB

Answer

10 dB

Answer

20 dB

Question 2

Which type of filter has the steepest skirt selectivity for a given number of poles?

Accepted Answer

Chebyshev

Answer

Butterworth

Answer

Bessel

Answer

Gaussian

Question 3

What is the purpose of interleaving in digital communication modes used by amateur operators?

Accepted Answer

To spread burst errors across multiple data blocks so error correction can recover the data

Answer

To increase the data transmission rate

Answer

To reduce the bandwidth of the transmitted signal

Answer

To encrypt the data for secure communication

Question 4

What is the third-order intercept point (IP3) of a receiver used to measure?

Accepted Answer

The receiver's ability to handle strong signals without generating intermodulation distortion

Answer

The maximum input signal level before clipping occurs

Answer

The minimum detectable signal level

Answer

The frequency accuracy of the local oscillator

Question 5

Under FCC Part 97, what is the maximum transmitter power level permitted on the 60-meter band for Amateur Extra licensees?

Accepted Answer

100 watts ERP

Answer

1500 watts PEP

Answer

200 watts PEP

Answer

50 watts ERP

Question 6

What is the effect of adding a loading coil to a mobile HF antenna that is shorter than a quarter wavelength?

Accepted Answer

It cancels the capacitive reactance, bringing the antenna to resonance

Answer

It increases the bandwidth of the antenna

Answer

It reduces the radiation resistance to zero

Answer

It converts the antenna from vertical to horizontal polarization