WorksheetsONLINE TEST TECHNICIAN
Total questions: 43
Worksheet time: 43mins
What is the unit of electric current?
Ohm
Volt
Ampere
Watt
What does Ohm's Law state?
Ohm
Volt
Ampere
Watt
If a circuit has a 12V battery and a resistance of 6 ohms, what is the current flow?
2 A
6 A
0.5 A
24 A
Which law states that the sum of currents entering a junction equals the sum of currents leaving the junction?
Kirchoff's Law
Ohm's Law
Newton's Law
Relativity Law
Which component allows current to flow only in one direction?
Resistor
Diode
Capacitor
Transistor
What is the primary function of a resistor in a circuit?
Store energy
Amplify signals
Limit current flow
Convert AC to DC
Which of the following is an active electronic component?
Transistor
Capacitor
Resistor
Inductor
What type of resistor changes resistance based on temperature?
Potentiometer
Thermistor
Rheostat
Photoresistor
What is the total resistance of two resistors (10Ω and 20Ω) in parallel?
30Ω
6.67Ω
15Ω
3Ω
What is the formula for electrical power?
P = VI
P = IR
P = V²R
P = I/R
What is the unit of electrical power?
Joule
Ampere
Watt
Ohm
Which device is used to measure electrical power?
Voltmeter
Ammeter
Wattmeter
Ohmmeter
Which tool is commonly used to check circuit voltage?
Oscilloscope
Multimeter
Signal generator
Resistor tester
What is the main purpose of a fuse in a circuit?
Increase voltage
Protect from overcurrent
Store charge
Act as a conductor
Which safety precaution should be taken when working with electrical circuits?
Use metal tools
Work with wet hands
Disconnect power source
Stand on a metal surface
A multimeter can measure which of the following?
Voltage
Current
Resistance
All of the above
What unit is used to measure electrical resistance?
Watt
Coulomb
Ohm
Farad
What is the unit of capacitance?
Henry
Farad
Ohm
Joule
Which type of capacitor is polarized?
Ceramic
Electrolytic
Film
Silver Mica
What happens when a capacitor is placed in a DC circuit?
It continuously allows current flow
It blocks DC after charging
It acts as a resistor
It amplifies voltage
What is the main function of an inductor in a circuit?
Store electric charge
Store magnetic energy
Increase resistance
Convert AC to DC
What is the basic component of a transistor?
Resistor
Capacitor
PN Junction
Inductor
What are the three terminals of a transistor?
Anode, Cathode, Base
Drain, Source, Gate
Emitter, Base, Collector
Positive, Negative, Ground
Which semiconductor device is used to amplify signals?
Diode
Transistor
Resistor
Capacitor
What is the base of the binary number system?
8
2
10
16
A NOT gate does what to the input signal?
Inverts it
Amplifies it
Maintains the same level
Adds a delay
What is the main purpose of a transformer?
Convert AC to DC
Change voltage levels
Store energy
Generate current
What type of transformer increases voltage?
Step-down
Auto-transformer
Step-up
Isolation
Which frequency is used for household AC power in most countries?
25 Hz
50 Hz
400 Hz
100 Hz
Which type of motor is most commonly used in industrial applications?
DC Motor
Stepper Motor
Induction Motor
Servo Motor
What happens if a three-phase motor loses one phase?
Change Rotation
Reverse turning direction
No Turning
Increase motor speed
Which device disconnects the circuit during overcurrent conditions?
Diode
Capacitor
Circuit Breaker
Transformer
What is the function of an Earth Ground connection?
Provides additional power
Prevents electric shock
Converts AC to DC
Regulates voltage
What does a UPS (Uninterruptible Power Supply) do?
Converts AC to DC
Provides backup power
Reduces voltage fluctuations
Supplies high voltage
Which type of signal is continuous and varies smoothly?
Digital
Binary
Analog
Pulse
What is the function of a modulator in communication systems?
Amplifies signals
Combines signals with a carrier wave
Filters unwanted frequencies
Generates noise
Which tool is used to measure electrical continuity?
Oscilloscope
Multimeter
Signal generator
Wattmeter
What is the purpose of an anti-static wrist strap?
Protect Hand and Finger
Protect from Over Voltage
Protect from Electric Short
Protect from Static Charge
What type of battery is commonly used in portable electronics?
Lead-acid
Lithium-ion
Nickel-metal hydride
Alkaline
What happens if a battery is overcharged?
It stores extra energy
It overheats and can be damaged
It operates more efficiently
It reduces internal resistance
Which component is used to regulate battery charging voltage?
Diode
Transformer
Voltage regulator
Inductor
What is the main purpose of an inverter?
Convert AC to DC
Convert DC to AC
Store electrical energy
Regulate voltage
Which material is most commonly used in electrical wiring?
Aluminum
Silver
Copper
Carbon
