Deep Dive: T6C08
The correct answer is Variable resistor. Based on the schematic diagram in figure T-2, component 9 is a variable resistor (potentiometer or rheostat), identified by its standard schematic symbol showing a resistor symbol with an arrow diagonally across it, indicating the resistance can be adjusted. Variable resistors allow you to change resistance values by turning a knob or adjusting a control. For amateur radio operators, variable resistors are used for volume controls, gain adjustments, bias settings, and tuning functions. Being able to identify variable resistors in schematics helps understand adjustable controls and circuit configuration.
Why Other Answers Are Wrong
Option A (Variable capacitor): Incorrect. Variable capacitors are shown as two parallel lines (capacitor symbol) with an arrow through them. Component 9 shows a resistor symbol with an arrow, not a capacitor. Option B (Variable inductor): Incorrect. Variable inductors are shown as coil symbols with an arrow. Component 9 shows the resistor symbol with an arrow. Option D (Variable transformer): Incorrect. Transformers are shown as coils with multiple windings. Component 9 shows the variable resistor symbol, not a transformer.
Exam Tip
Variable resistor = resistor symbol (zigzag or rectangle) with diagonal arrow. The arrow indicates adjustability. Variable capacitors have parallel lines with arrows, variable inductors have coils with arrows. If it's a resistor symbol with an arrow, it's a variable resistor.
Memory Aid
Variable resistor = resistor symbol with arrow. Think 'V'ariable 'R'esistor = 'R'esistor with a'R'row. The arrow shows it's adjustable.
Real-World Example
In your transceiver's audio circuit, component 9 might be the volume control potentiometer. Turning the knob adjusts the resistance, which changes the audio level. Understanding variable resistor symbols helps you identify adjustable controls in schematics.
Source & Coverage
Question Pool: 2026-2030 Question Pool
Subelement: T6C
Reference: 2026-2030 Question Pool · T6 - Electrical components
Key Concepts
Official Pool Source
Question text and answer key are synchronized with the current NCVEC Technician Class pool and mapped to the T6C topic.