Amateur Extra: Network Impedance

Polar coordinates

The Amateur Extra class question of the week comes from sub-element 5 (electrical principles) section C (polar coordinates) [E5C06] In polar coordinates, what is the impedance of a network consisting of a 100-ohm-reactance capacitor in series with a 100-ohm resistor? A. 121 ohms at an angle of -25 degrees B. 191 ohms at an angle … Read more

Technician: Q Signal for interference?

Q Signals

This week’s Tech question comes from sub-element 2 (Operating Procedures,) group B (Q signals) [T2B10] Which Q signal indicates that you are receiving interference from other stations? A. QRMB. QRNC. QTHD. QSB There’s really no good way to understand what the Q signals mean except to memorize them.  I know, I know, it goes against … Read more

Amateur Extra: Minimum Discernable Signal

Radio Receiver

The Amateur Extra torture question of the week is taken from sub-element 4 (amateur practices) section C (receiver performance) [E4C07] What does the MDS of a receiver represent? A. The meter display sensitivity B. The minimum discernible signal C. The multiplex distortion stability D. The maximum detectable spectrum If you stop to think about the … Read more

General: NiCd Battery Resistance

NiCd Battery Disassembled

This week’s General Class exam question is from sub-element 6 (Resistors; capacitors; inductors) section B (batteries)… [G6B13] What is an advantage of the low internal resistance of nickel-cadmium batteries? A. Long life B. High discharge current C. High voltage D. Rapid recharge Nickel Cadmium, or NiCd, rechargeable batteries aren’t as popular as they once were, … Read more

Amateur Extra: N-Type Charge Carriers

Charge Transfer

Extra question of the day is from sub-element 6 (circuit components) section A (n-type semiconductors) [E6A16] What are the majority charge carriers in N-type semiconductor material? A. Holes B. Free electrons C. Free protons D. Free neutrons First, remember what the N-type designator means.  It indicates that the device uses Negatively charged carriers.   Protons and … Read more

General: Resistance and Temperature

Electrical Components

The General class exam question of the week is from sub-element 6 (circuit components) section A (resistors) [G6A06] What will happen to the resistance if the temperature of a resistor is increased? A. It will change depending on the resistor’s reactance coefficient B. It will stay the same C. It will change depending on the … Read more