Ham Radio General Class Test Ham Radio General Class Test Electronic Principles and Circuits Questions and Answers 2 — Questions and Answers
Question 1: What is the total resistance of three 300-ohm resistors connected in parallel?
- 100 ohms (Correct answer)
- 300 ohms
- 900 ohms
- 33 ohms
Correct answer: 100 ohms
Parallel resistance of equal resistors equals the value of one resistor divided by the number of resistors: 300/3 = 100 ohms.
Question 2: What type of filter is used to pass frequencies above a specified cutoff frequency while attenuating frequencies below it?
- High-pass filter (Correct answer)
- Low-pass filter
- Band-pass filter
- Notch filter
Correct answer: High-pass filter
A high-pass filter allows signals above the cutoff frequency to pass and attenuates lower frequencies.
Question 3: What is the purpose of a bypass capacitor in an amplifier circuit?
- To provide a low-impedance path to ground for AC signals (Correct answer)
- To block DC from reaching the output
- To increase the input impedance
- To regulate the supply voltage
Correct answer: To provide a low-impedance path to ground for AC signals
A bypass capacitor shunts unwanted AC signals to ground, preventing them from affecting the circuit's bias point.
Question 4: In a series RLC circuit at resonance, what is the relationship between inductive reactance and capacitive reactance?
- They are equal and cancel each other (Correct answer)
- Inductive reactance is twice capacitive reactance
- Capacitive reactance is zero
- Both are at their maximum values
Correct answer: They are equal and cancel each other
At resonance, inductive reactance equals capacitive reactance, and they cancel, leaving only the resistance in the circuit.
Question 5: What happens to the capacitance of a capacitor if the plate area is doubled while keeping the plate spacing constant?
- Capacitance doubles (Correct answer)
- Capacitance is halved
- Capacitance quadruples
- Capacitance remains the same
Correct answer: Capacitance doubles
Capacitance is directly proportional to plate area, so doubling the area doubles the capacitance.
Question 6: What is the primary advantage of a MOSFET over a bipolar junction transistor in RF amplifier applications?
- Very high input impedance (Correct answer)
- Higher current gain
- Lower cost
- Simpler biasing requirements
Correct answer: Very high input impedance
MOSFETs have extremely high input impedance due to their insulated gate, which minimizes loading on the driving circuit.
Ham Radio General Class Test Ham Radio General Class Test Electronic Principles and Circuits Questions and Answers 2
What is the total resistance of three 300-ohm resistors connected in parallel?