Introduction to Electrical Engineering MCQs (Part-3)

What is the role of a transformer in an electrical system?

A Step up or step down voltage
B Convert AC to DC
C Store electrical energy
D Measure current

What is the primary purpose of a capacitor in a circuit?

A Measure current
B Generate electrical energy
C Block current flow
D Store electrical energy

Which of the following is a characteristic of a DC system?

A Current changes direction
B Frequency is 50 Hz
C Voltage is constant
D Used in transformers

What is the function of a diode in a circuit?

A Amplify signals
B Allow current in one direction
C Store energy
D Measure voltage

What is the unit of electrical energy?

A Volt
B Joule
C Ampere
D Ohm

What is the unit of electric potential?

A Watt
B Ampere
C Ohm
D Volt

What is the SI unit of electric charge?

A Coulomb
B Volt
C Ampere
D Ohm

What is the relationship between power, voltage, and current?

A P = V^2 / I
B P = V I
C P = V / I^2
D P = V / I

Which law describes the force between two electric charges?

A Ohm’s Law
B Faraday’s Law
C Kirchhoff’s Law
D Coulomb’s Law

Which of the following is a characteristic of an AC system?

A Frequency is 50 Hz or 60 Hz
B Current flows in one direction
C Voltage is constant
D Used in batteries

Which of the following is a renewable energy source?

A Coal
B Wind energy
C Natural gas
D Nuclear energy

Which of the following is a safety measure in electrical systems?

A Increasing voltage
B Using high resistance
C Grounding
D Using copper wires

Which of the following is an example of an insulator?

A Rubber
B Copper
C Aluminum
D Silver

Which device is used to measure electric current?

A Voltmeter
B Ohmmeter
C Ammeter
D Wattmeter

What is the primary function of a switch in a circuit?

A Store energy
B Generate power
C Control current flow
D Measure voltage