FREE Ham Radio Technician Amateur Questions and Answers

Question 1

How does a fast-scan (NTSC) television system produce an interlaced scanning pattern?

Accepted Answer

By scanning odd numbered lines in one field and even numbered lines in the next

Answer

By scanning two fields simultaneously

Answer

By scanning each field from bottom to top

Answer

By scanning lines from left to right in one field and right to left in the next

Question 2

In a push-pull Class AB amplifier, how long does each active component operate throughout a signal cycle?

Accepted Answer

More than 180 degrees but less than 360 degrees

Answer

Less than 180 degrees

Answer

Exactly 180 degrees

Answer

The entire cycle

Question 3

What does it mean when a transmitter is set to resonance, and the current reading on an RF ammeter connected in series with the antenna feed line rises?

Accepted Answer

There is more power going into the antenna

Answer

There is possibly a short to ground in the feed line

Answer

The transmitter is not properly neutralized

Answer

There is an impedance mismatch between the antenna and feed line

Question 4

What causes a junction diode to fail when there is too much current flowing through it?

Accepted Answer

Excessive junction temperature

Answer

Change carrier depletion

Answer

Excessive inverse voltage

Answer

Insufficient forward voltage

Question 5

Which best defines a Pi-L-network used to match a 50-ohm unbalanced output of a vacuum tube final amplifier?

Accepted Answer

A Pi-network with an additional series inductor on the output

Answer

A matching network in which all components are isolated from ground

Answer

A Phase Inverter Load network

Answer

A network with only  three discrete parts

Question 6

What may make a series RLC circuit's reactance voltage exceed the voltage applied to the circuit as a whole?

Accepted Answer

Resonance

Answer

Capacitance

Answer

Resistance

Answer

Conductance

Question 7

When a transmission line is shorted at the other end, what impedance does it present to a generator?

Accepted Answer

Very low impedance

Answer

Very high impedance

Answer

The same as the output impedance of the generator

Answer

The same as the characteristic impedance of the line

Question 8

What situations give digital messaging an exception to the Part 97 third-party regulations that apply to traditional forms of communication?

Accepted Answer

Under no circumstances

Answer

When under automatic control

Answer

When messages are encrypted

Answer

When messages are not encrypted

Question 9

According to FCC regulations, what is the maximum bandwidth allowed for amateur radio stations using USB frequencies in the 60-meter band?

Accepted Answer

2.8 kHz

Answer

1.8 kHz

Answer

5.6 kHz

Answer

3 kHz

Question 10

How long would a 1/4 wave vertical antenna cut for 28.5 MHz be roughly speaking?

Accepted Answer

8 feet

Answer

21 feet

Answer

16 feet

Answer

11 feet