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ELECTRONICS TECHNICIANS
ASSOCIATION INTERNATIONAL
CERTIFIED ELECTRONICS TECHNICIAN
(CET) EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT
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- What is the unit of electrical resistance? A. Volt B. Ampere C. Ohm D. Watt Correct Answer: C. Ohm Rationale: Resistance is measured in ohms (Ω), which indicates opposition to current flow.
- Which law states V = I × R? A. Kirchhoff’s Law B. Ohm’s Law C. Faraday’s Law D. Joule’s Law Correct Answer: B. Ohm’s Law Rationale: Ohm’s Law defines the relationship between voltage, current, and resistance.
- What device stores electrical energy in an electric field? A. Resistor B. Inductor C. Capacitor D. Transformer Correct Answer: C. Capacitor Rationale: Capacitors store energy in an electric field between plates.
- What is the primary function of a diode? A. Amplify signal B. Store energy C. Allow one-way current flow D. Increase voltage Correct Answer: C. Allow one-way current flow Rationale: Diodes permit current flow in one direction only.
- Which component opposes changes in current? A. Resistor B. Capacitor C. Inductor D. Switch Correct Answer: C. Inductor Rationale: Inductors resist changes in current due to magnetic fields.
- What does AC stand for? A. Alternating Current B. Active Circuit C. Applied Charge D. Amplified Current Correct Answer: A. Alternating Current Rationale: AC reverses direction periodically.
- What is the unit of current? A. Volt B. Ohm
Correct Answer: B. Watts Rationale: Power is measured in watts (W). 12.What does a transistor primarily do? A. Rectify AC B. Amplify or switch signals C. Store energy D. Measure voltage Correct Answer: B. Amplify or switch signals Rationale: Transistors act as amplifiers and switches. 13.Which component is used to step up or step down voltage? A. Resistor B. Transformer C. Capacitor D. Diode Correct Answer: B. Transformer Rationale: Transformers change voltage levels via induction. 14.What is a short circuit? A. High resistance path B. Open circuit C. Low resistance unintended path D. Controlled resistance Correct Answer: C. Low resistance unintended path Rationale: A short circuit allows excessive current flow. 15.What does a multimeter measure? A. Only voltage B. Only current C. Voltage, current, resistance D. Only resistance Correct Answer: C. Voltage, current, resistance Rationale: Multimeters measure multiple electrical quantities.
16.What is the function of a capacitor in AC circuits? A. Block AC B. Store DC only C. Pass AC signals D. Increase resistance Correct Answer: C. Pass AC signals Rationale: Capacitors allow AC while blocking DC. 17.What is frequency measured in? A. Watts B. Hertz C. Ohms D. Volts Correct Answer: B. Hertz Rationale: Frequency is cycles per second (Hz). 18.What is an oscilloscope used for? A. Measure resistance B. Visualize waveforms C. Increase voltage D. Store energy Correct Answer: B. Visualize waveforms Rationale: Oscilloscopes display electrical signals over time. 19.What type of current flows in batteries? A. AC B. DC C. RF D. Pulsed AC Correct Answer: B. DC Rationale: Batteries supply direct current. 20.What is resistance in a circuit? A. Flow of electrons B. Opposition to current flow
Correct Answer: B. Electrostatic Discharge Rationale: ESD is sudden static electricity release. 25.What protects electronics from ESD? A. Transformer B. Grounding strap C. Fuse D. Resistor Correct Answer: B. Grounding strap Rationale: Wrist straps discharge static safely. 26.What is inductance measured in? A. Farads B. Ohms C. Henry D. Watts Correct Answer: C. Henry Rationale: Inductance is measured in henries. 27.What is a rectifier used for? A. Convert DC to AC B. Convert AC to DC C. Amplify signals D. Store energy Correct Answer: B. Convert AC to DC Rationale: Rectifiers convert AC into DC. 28.What is gain in electronics? A. Resistance increase B. Signal amplification C. Power loss D. Frequency drop Correct Answer: B. Signal amplification Rationale: Gain measures amplification level.
29.What is a relay? A. Mechanical switch controlled electrically B. Power supply C. Capacitor type D. Resistor type Correct Answer: A. Mechanical switch controlled electrically Rationale: Relays use electromagnets to switch circuits. 30.What is the function of a ground connection? A. Increase voltage B. Provide reference point and safety C. Store current D. Amplify signals Correct Answer: B. Provide reference point and safety Rationale: Ground ensures safety and stable reference. 31.What does a resistor primarily control? A. Voltage B. Current C. Frequency D. Power generation Correct Answer: B. Current Rationale: Resistors limit current flow. 32.What is a circuit breaker? A. Energy storage device B. Automatic safety switch C. Amplifier D. Transformer Correct Answer: B. Automatic safety switch Rationale: Circuit breakers protect against overload. 33.What is alternating current waveform typically? A. Straight line B. Square only
Correct Answer: B. Frequency range of a signal Rationale: Bandwidth defines usable frequency range. 38.What does an inductor store? A. Electric field B. Magnetic energy C. Heat D. Light Correct Answer: B. Magnetic energy Rationale: Inductors store energy in magnetic fields. 39.What is digital electronics based on? A. Continuous signals B. Binary values C. Mechanical motion D. Heat flow Correct Answer: B. Binary values Rationale: Digital systems use 0 and 1. 40.What is logic gate output based on? A. Temperature B. Input logic conditions C. Voltage only D. Resistance Correct Answer: B. Input logic conditions Rationale: Logic gates process binary inputs. 41.What is the main purpose of a heat sink? A. Store electrical energy B. Increase voltage C. Dissipate heat from components D. Amplify signals Correct Answer: C. Dissipate heat from components Rationale: Heat sinks transfer heat away from electronic components to prevent overheating.
42.What is the binary equivalent of decimal 5? A. 101 B. 110 C. 111 D. 100 Correct Answer: A. 101 Rationale: Decimal 5 converts to binary as 101. 43.What is a logic AND gate output when both inputs are 1? A. 0 B. 1 C. Undefined D. High impedance Correct Answer: B. 1 Rationale: AND gate outputs 1 only when both inputs are 1. 44.What does a capacitor block in DC circuits? A. Resistance B. Voltage C. DC current D. Frequency Correct Answer: C. DC current Rationale: Capacitors block steady-state DC after charging. 45.What is the function of a voltage regulator? A. Increase current B. Maintain constant output voltage C. Store charge D. Convert AC to DC Correct Answer: B. Maintain constant output voltage Rationale: Voltage regulators stabilize output voltage levels. 46.What type of signal is digital electronics based on? A. Continuous wave B. Analog only
Correct Answer: B. Testing circuits without soldering Rationale: Breadboards allow temporary circuit prototyping. 51.What does a logic OR gate output when at least one input is 1? A. 0 B. 1 C. Undefined D. High resistance Correct Answer: B. 1 Rationale: OR gate outputs 1 if any input is 1. 52.What is a common unit for energy in electronics? A. Watt B. Joule C. Volt D. Ampere Correct Answer: B. Joule Rationale: Electrical energy is measured in joules. 53.What does a transformer rely on? A. Electrostatic force B. Electromagnetic induction C. Heat transfer D. Chemical reaction Correct Answer: B. Electromagnetic induction Rationale: Transformers operate using electromagnetic induction. 54.What is the purpose of shielding in cables? A. Increase resistance B. Reduce electromagnetic interference C. Store energy D. Increase voltage Correct Answer: B. Reduce electromagnetic interference Rationale: Shielding protects signals from noise.
55.What is the function of a potentiometer? A. Fixed resistance B. Variable resistance C. Current generation D. Signal amplification Correct Answer: B. Variable resistance Rationale: Potentiometers adjust resistance manually. 56.What is a NAND gate output when both inputs are 1? A. 0 B. 1 C. Undefined D. High impedance Correct Answer: A. 0 Rationale: NAND is NOT AND, so output is 0 only when both inputs are 1. 57.What is the main function of a NAND gate? A. Invert signal B. Universal logic gate C. Store data D. Amplify current Correct Answer: B. Universal logic gate Rationale: NAND gates can build any digital circuit. 58.What is a NOR gate output when all inputs are 0? A. 0 B. 1 C. Undefined D. High impedance Correct Answer: B. 1 Rationale: NOR outputs 1 only when all inputs are 0. 59.What is leakage current? A. Desired current B. Small unwanted current
Correct Answer: B. Memory storage circuit Rationale: Flip-flops store binary data. 64.What is the function of a buffer circuit? A. Increase resistance B. Isolate stages C. Store charge D. Convert AC to DC Correct Answer: B. Isolate stages Rationale: Buffers prevent loading between circuit stages. 65.What is a MOSFET? A. Mechanical switch B. Metal Oxide Semiconductor Field Effect Transistor C. Power resistor D. Inductor type Correct Answer: B. Metal Oxide Semiconductor Field Effect Transistor Rationale: MOSFETs are voltage-controlled transistors. 66.What is the main function of a capacitor in DC power supply? A. Block AC ripple B. Increase resistance C. Amplify current D. Convert voltage Correct Answer: A. Block AC ripple Rationale: Capacitors smooth rectified DC output. 67.What is an amplifier? A. Reduces signal B. Increases signal strength C. Stores data D. Converts AC to DC Correct Answer: B. Increases signal strength Rationale: Amplifiers boost signal amplitude.
68.What is thermal runaway? A. Controlled cooling B. Increasing temperature causing more current flow C. Voltage regulation D. Signal amplification Correct Answer: B. Increasing temperature causing more current flow Rationale: Thermal runaway leads to component failure. 69.What is the main function of a clock signal? A. Store data B. Synchronize digital circuits C. Increase voltage D. Reduce noise Correct Answer: B. Synchronize digital circuits Rationale: Clock signals coordinate timing in digital systems. 70.What is a decoder in digital electronics? A. Amplifier B. Converts binary to output signals C. Stores memory D. Filters noise Correct Answer: B. Converts binary to output signals Rationale: Decoders translate binary inputs into outputs. 71.What is the function of an encoder? A. Amplify signal B. Convert data into binary C. Store power D. Reduce voltage Correct Answer: B. Convert data into binary Rationale: Encoders convert inputs into binary code. 72.What is a multiplexer? A. One output, many inputs selection B. One input, many outputs
Correct Answer: C. NOT gate Rationale: Inverters reverse logic state. 77.What is an IC? A. Internal circuit B. Integrated circuit C. Input capacitor D. Inductive coil Correct Answer: B. Integrated circuit Rationale: ICs contain many components in one chip. 78.What is the purpose of biasing a transistor? A. Increase resistance B. Set operating point C. Store energy D. Convert AC to DC Correct Answer: B. Set operating point Rationale: Biasing ensures proper transistor operation. 79.What is gain bandwidth product? A. Power rating B. Frequency limit of amplification C. Resistance level D. Voltage drop Correct Answer: B. Frequency limit of amplification Rationale: It defines amplifier performance limits. 80.What is a sensor? A. Output device B. Device that detects physical conditions C. Power supply D. Memory unit Correct Answer: B. Device that detects physical conditions Rationale: Sensors convert physical data into electrical signals.
81.What is an ADC? A. Analog Device Controller B. Analog to Digital Converter C. Amplifier Digital Circuit D. Automatic Data Controller Correct Answer: B. Analog to Digital Converter Rationale: ADC converts analog signals to digital form. 82.What is a DAC? A. Digital to Analog Converter B. Data Amplification Controller C. Direct AC Converter D. Digital Audio Control Correct Answer: A. Digital to Analog Converter Rationale: DAC converts digital signals to analog. 83.What is hysteresis in electronics? A. Memory loss B. Delay between input and output change C. Power increase D. Voltage drop Correct Answer: B. Delay between input and output change Rationale: Hysteresis prevents rapid switching noise. 84.What is the function of a capacitor in filtering? A. Increase noise B. Smooth signal variations C. Amplify signal D. Store data Correct Answer: B. Smooth signal variations Rationale: Capacitors reduce ripple and noise. 85.What is the main function of a transistor switch? A. Amplify continuously B. Turn current on/off
