Electrical Engineering Quiz

What is the function of a rectifier in a power supply?

• To amplify signals

• To convert AC to DC

• To store charge

• To measure voltage

A zigzag line with an arrow through it represents:

• Resistor

• Variable resistor

• Thermistor

• Transformer

Which type of sensor would be best for detecting gas leaks?

• Infrared sensor

• Piezoelectric sensor

• Gas sensor

• Light sensor

Why do LEDs require a resistor in series?

• To increase brightness

• To limit current and prevent damage

• To store energy

• To increase voltage

What is measured in ohms (Ω)?

• Voltage

• Current

• Resistance

• Capacitance

What type of diode emits light?

• Zener diode

• LED

• Schottky diode

• Photodiode

Why are PWM (Pulse Width Modulation) techniques used in inverters?

• To increase harmonic distortion

• To improve efficiency

• To decrease switching speed

• To lower voltage levels

What is a semiconductor?

• A material with zero resistance

• A material with electrical properties between a conductor and an insulator

• A material that only conducts at high temperatures

• A material that cannot conduct electricity

What is the function of an inverter?

• Convert AC to DC

• Convert DC to AC

• Store electrical energy

• Reduce voltage fluctuations

If a semiconductor is doped with phosphorus, what type does it become?

• P-type

• N-type

• Intrinsic

• Neutral