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Electronics Technicians Association
Certified Electronics Associate
Examination Practice Exam Question
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- What is the primary function of a resistor in a circuit? A. Store energy B. Oppose current flow C. Generate voltage D. Amplify signals Answer: B. Oppose current flow Rationale: A resistor limits or opposes the flow of electric current, converting some electrical energy into heat. It is fundamental for controlling voltage and current levels in circuits.
- Which unit measures electric current? A. Volt B. Ohm C. Ampere D. Watt Answer: C. Ampere Rationale: The ampere (A) is the SI unit of electric current, representing the flow of one coulomb of charge per second.
- Ohm’s Law is expressed as: A. P = IV B. V = IR C. I = PR D. V = I/P Answer: B. V = IR Rationale: Ohm’s Law defines the relationship between voltage, current, and resistance, stating voltage equals current multiplied by resistance.
- A capacitor stores energy in: A. Magnetic field B. Chemical field C. Electric field D. Thermal field Answer: C. Electric field Rationale: Capacitors store energy by accumulating electric charge between two conductive plates separated by an insulator.
- The SI unit of resistance is: A. Volt B. Ohm C. Ampere D. Henry Answer: B. Ohm Rationale: The ohm measures electrical resistance, indicating how much a component resists current flow.
- What device converts AC to DC? A. Transformer B. Rectifier C. Oscillator D. Amplifier Answer: B. Rectifier
Answer: B. Overcurrent Rationale: A fuse melts when current exceeds safe levels, breaking the circuit to prevent damage. 11.Which component stores magnetic energy? A. Capacitor B. Inductor C. Resistor D. Diode Answer: B. Inductor Rationale: Inductors store energy in a magnetic field when current flows through a coil. 12.Power in an electrical circuit is measured in: A. Watts B. Volts C. Amps D. Ohms Answer: A. Watts Rationale: Watt is the unit of power, representing the rate of electrical energy consumption or transfer. 13.What is the function of a transistor? A. Store charge B. Switch or amplify signals C. Block current D. Convert AC to DC Answer: B. Switch or amplify signals Rationale: Transistors control current flow and are widely used for amplification and switching in electronics. 14.A short circuit causes: A. Increased resistance B. Reduced current C. Excessive current flow
D. No current flow Answer: C. Excessive current flow Rationale: A short circuit creates a low-resistance path, allowing dangerously high current. 15.Conductors have: A. High resistance B. No electrons C. Free electrons D. No voltage Answer: C. Free electrons Rationale: Conductors allow easy movement of electrons due to loosely bound outer electrons. 16.Insulators are used to: A. Conduct current B. Store energy C. Prevent current flow D. Amplify signals Answer: C. Prevent current flow Rationale: Insulators resist electrical flow, protecting circuits and users. 17.What is the unit of capacitance? A. Henry B. Farad C. Tesla D. Joule Answer: B. Farad Rationale: The farad measures a capacitor’s ability to store electric charge. 18.AC stands for: A. Active Current B. Alternating Current C. Amplified Current
Answer: A. Light Emitting Diode Rationale: LEDs emit light when current passes through them. 23.What is resistance affected by? A. Color only B. Length and material C. Voltage only D. Current only Answer: B. Length and material Rationale: Resistance depends on material properties, length, and cross- sectional area. 24.The function of a switch is to: A. Store energy B. Control circuit flow C. Increase voltage D. Reduce resistance Answer: B. Control circuit flow Rationale: Switches open or close circuits to allow or stop current flow. 25.A battery converts: A. Mechanical energy to electrical energy B. Chemical energy to electrical energy C. Heat to light D. Light to sound Answer: B. Chemical energy to electrical energy Rationale: Batteries generate electricity through chemical reactions. 26.What is impedance? A. DC resistance only B. AC opposition to current C. Voltage storage D. Current generation Answer: B. AC opposition to current Rationale: Impedance includes resistance and reactance in AC circuits.
27.A circuit breaker: A. Stores energy B. Automatically disconnects on overload C. Amplifies signals D. Converts AC to DC Answer: B. Automatically disconnects on overload Rationale: Circuit breakers protect circuits from overcurrent by tripping automatically. 28.What is a waveform? A. Physical wire B. Graph of signal variation C. Battery type D. Resistor type Answer: B. Graph of signal variation Rationale: Waveforms show how voltage or current changes over time. 29.The purpose of grounding is to: A. Increase voltage B. Provide safety path to earth C. Store charge D. Amplify signal Answer: B. Provide safety path to earth Rationale: Grounding protects equipment and users from electrical faults. 30.A coil is another name for: A. Resistor B. Inductor C. Capacitor D. Diode Answer: B. Inductor Rationale: Coils are wire windings that create magnetic fields when current flows.
35.What causes electrical noise in circuits? A. Perfect insulation B. Unwanted electromagnetic signals C. High resistance only D. Low voltage only Answer: B. Unwanted electromagnetic signals Rationale: Noise is interference that disrupts clean signal transmission in electronic systems. 36.What is the function of a heat sink? A. Store energy B. Dissipate heat C. Conduct electricity D. Increase resistance Answer: B. Dissipate heat Rationale: Heat sinks remove excess heat from components like transistors to prevent overheating. 37.What is the binary equivalent of decimal 5? A. 110 B. 101 C. 111 D. 100 Answer: B. 101 Rationale: Decimal 5 converts to binary 101 using base-2 representation. 38.What is a common fault in electronics troubleshooting? A. Overcooling B. Open circuit C. Excess resistance D. High brightness Answer: B. Open circuit Rationale: An open circuit breaks current flow, causing device failure.
39.What does a zener diode regulate? A. Current B. Frequency C. Voltage D. Resistance Answer: C. Voltage Rationale: Zener diodes maintain a stable voltage in reverse breakdown mode. 40.What is the function of a relay? A. Amplify sound B. Electrically control a switch C. Store charge D. Measure current Answer: B. Electrically control a switch Rationale: Relays use electromagnetic coils to open or close circuits. 41.What is capacitance affected by? A. Only voltage B. Plate area and distance C. Only current D. Only resistance Answer: B. Plate area and distance Rationale: Capacitance depends on the size of plates and separation between them. 42.What is a common use of a potentiometer? A. Generate power B. Variable resistance adjustment C. Convert AC to DC D. Increase frequency Answer: B. Variable resistance adjustment Rationale: Potentiometers adjust voltage levels in circuits.
47.What is the main purpose of a fuse rating? A. Color coding B. Maximum safe current C. Voltage amplification D. Resistance value Answer: B. Maximum safe current Rationale: Fuse ratings indicate current limits before failure. 48.What is a multimeter continuity test used for? A. Measure voltage B. Check circuit connection C. Measure power D. Detect light Answer: B. Check circuit connection Rationale: Continuity tests determine if a path is electrically complete. 49.What does a logic NOT gate do? A. Copies input B. Inverts input C. Adds inputs D. Multiplies signals Answer: B. Inverts input Rationale: NOT gate outputs the opposite logic state of its input. 50.What is the function of grounding in safety systems? A. Increase resistance B. Prevent electric shock C. Amplify signal D. Store charge Answer: B. Prevent electric shock Rationale: Grounding directs fault current safely into the earth. Questions 51– 100
51.What is the main advantage of digital circuits over analog circuits? A. Less accuracy B. Better noise immunity C. More heat D. Higher resistance Answer: B. Better noise immunity Rationale: Digital signals are less affected by noise because they use discrete states. 52.What is the function of a buffer circuit? A. Store energy B. Isolate stages C. Convert AC to DC D. Increase resistance Answer: B. Isolate stages Rationale: Buffers prevent loading effects between circuit stages. 53.What is the unit of inductance? A. Farad B. Henry C. Ohm D. Volt Answer: B. Henry Rationale: Henry measures inductance in inductors. 54.What is aliasing in signals? A. Amplification error B. Sampling distortion C. Resistance increase D. Voltage drop Answer: B. Sampling distortion Rationale: Aliasing occurs when sampling frequency is too low. 55.What is a common use of flip-flops? A. Heat control
Answer: B. Reduce noise Rationale: They stabilize voltage by filtering high-frequency noise. 60.What is a logic AND gate output when all inputs are 1? A. 0 B. 1 C. Undefined D. Alternating Answer: B. 1 Rationale: AND gate outputs high only when all inputs are high. 61.What is the purpose of ESD protection in electronics? A. Increase current B. Prevent static damage C. Amplify signal D. Reduce resistance Answer: B. Prevent static damage Rationale: Electrostatic discharge (ESD) can destroy sensitive components, so protection methods like grounding and wrist straps are used. 62.What is modulation? A. Increasing resistance B. Varying a signal to carry information C. Blocking current D. Storing charge Answer: B. Varying a signal to carry information Rationale: Modulation encodes information onto a carrier wave for transmission. 63.What does amplitude refer to in a waveform? A. Frequency B. Height of signal C. Resistance D. Phase shift
Answer: B. Height of signal Rationale: Amplitude represents the strength or magnitude of a signal. 64.What is the function of a band-pass filter? A. Blocks all signals B. Allows a range of frequencies C. Converts AC to DC D. Amplifies noise Answer: B. Allows a range of frequencies Rationale: Band-pass filters pass frequencies within a set range while blocking others. 65.What is a microcontroller used for? A. Manual switching B. Embedded system control C. Power storage D. Signal reflection Answer: B. Embedded system control Rationale: Microcontrollers automate and control electronic systems. 66.What is the function of RAM in electronics? A. Permanent storage B. Temporary data storage C. Power conversion D. Signal amplification Answer: B. Temporary data storage Rationale: RAM holds data temporarily while a system is running. 67.What is a semiconductor junction? A. Metal connection B. P-N boundary C. Wire joint D. Insulator layer Answer: B. P-N boundary
Answer: B. Convert analog to digital Rationale: ADCs allow digital systems to process real-world analog signals. 72.What is a common cause of circuit failure? A. Proper insulation B. Overheating C. Low frequency D. Clean signals Answer: B. Overheating Rationale: Excess heat damages components and leads to failure. 73.What is a schematic diagram? A. Physical layout B. Symbolic circuit representation C. Voltage graph D. Power chart Answer: B. Symbolic circuit representation Rationale: Schematics show electrical connections using symbols. 74.What is the role of a crystal oscillator? A. Store memory B. Generate precise frequency C. Increase voltage D. Block noise Answer: B. Generate precise frequency Rationale: Crystal oscillators provide stable clock signals in electronics. 75.What is logic 0 typically? A. High voltage B. Low or zero voltage C. High resistance D. AC signal Answer: B. Low or zero voltage Rationale: Logic 0 represents a low voltage state in digital circuits.
76.What is the function of a comparator? A. Store data B. Compare voltages C. Convert AC D. Amplify power Answer: B. Compare voltages Rationale: Comparators output signals based on voltage comparison. 77.What is ripple in power supply? A. Noise in signal B. Remaining AC component C. Heat increase D. Resistance change Answer: B. Remaining AC component Rationale: Ripple is unwanted AC variation in DC output. 78.What is a pull-up resistor used for? A. Increase current B. Set default HIGH state C. Block voltage D. Amplify signal Answer: B. Set default HIGH state Rationale: Pull-up resistors ensure defined logic levels when inputs are floating. 79.What is the main purpose of testing diodes? A. Measure resistance only B. Check forward/reverse conduction C. Increase voltage D. Store energy Answer: B. Check forward/reverse conduction Rationale: Diodes must allow current in one direction only. 80.What is a common digital communication protocol? A. HDMI
