FREE Ham Radio Technician II Questions And Answers

Question 1

What mathematical formula should be used to determine the power lost by a series linear voltage regulator?

Accepted Answer

Voltage difference from input to out multiplied by output current

Answer

A series linear voltage regulator dissipates excess power as heat. The power lost (P_loss) is calculated by multiplying the voltage drop across the series pass element by the current flowing through it. Since the output current (I_out) is essentially the same as the current through the series element, and the voltage drop is the difference between the input voltage (V_in) and the output voltage (V_out), the formula is P_loss = (V_in - V_out) * I_out.

Question 2

When during the day does transequatorial propagation work best?

Accepted Answer

Afternoon or early evening

Answer

Transequatorial propagation (TEP) is a type of ionospheric propagation that occurs across the magnetic equator, typically on VHF bands. It is most common during the afternoon and early evening hours, particularly around the equinoxes. During these times, the F2 layer of the ionosphere is strongly ionized and exhibits specific characteristics that allow signals to 'duct' across the equator, enabling long-distance contacts.

Question 3

Where are the rectangular coordinates for the impedance of a pure resistance plotted?

Accepted Answer

On the horizontal axis

Answer

On a Smith chart, the horizontal axis (often called the r-axis) represents purely resistive impedances. Points located on this axis have zero reactance, meaning the impedance is entirely resistive. Moving along this axis from left to right corresponds to increasing resistance, with the center of the chart representing the characteristic impedance (pure resistance).

Question 4

Which of the following best depicts how a receiving filter might block signals coming from an adjacent channel?

Accepted Answer

Shape factor

Answer

The shape factor of a filter describes how steep its skirts are, indicating how quickly its attenuation increases outside the passband. A lower shape factor signifies a sharper, more selective filter. A good shape factor is crucial for a receiving filter to effectively block strong signals from adjacent channels while allowing the desired signal to pass through with minimal interference, thus improving receiver selectivity.

Question 5

Which of the following carrier frequencies is prohibited for LSB AFSK transmissions on the RTTY 17-meter band and the 18.068–18.110 MHz data segment?

Accepted Answer

18.068 MHz

Answer

The 17-meter RTTY/data segment is 18.068–18.110 MHz. For LSB (Lower Sideband) transmissions, the signal occupies frequencies below the carrier. If the carrier is set to 18.068 MHz, the entire signal would extend below the lower band edge, violating band plan rules. To operate legally, the carrier frequency must be sufficiently above the lower band edge so that the entire sideband remains within the allocated segment.

Ham Radio Technician Test Practice Test

Ham Radio Technician Test Practice Test

FREE Ham Radio Technician II Questions And Answers