Introduction to Electrical Engineering MCQs (Part-1)

Which device converts electrical energy into mechanical energy?

A Generator
B Transformer
C Battery
D Motor

What is the SI unit of electric current?

A Ampere
B Ohm
C Volt
D Watt

Which law states that the sum of voltages around a closed loop is zero?

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

What is the unit of electrical resistance?

A Ohm
B Volt
C Ampere
D Joule

Which of the following is a semiconductor material?

A Silicon
B Copper
C Aluminum
D Silver

Which material is the best conductor of electricity?

A Rubber
B Wood
C Glass
D Copper

What is the primary function of a resistor in an electrical circuit?

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

Which law states that the current through a conductor is directly proportional to the voltage across it?

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

What is the purpose of a fuse in an electrical circuit?

A Increase current flow
B Store energy
C Measure voltage
D Protect against overcurrent

What is the role of an insulator in an electrical system?

A Store electricity
B Block electricity
C Generate electricity
D Conduct electricity

What does Kirchhoff’s Current Law (KCL) state?

A The sum of voltages in a loop is zero.
B The current in a circuit is proportional to voltage.
C The sum of currents entering a junction equals the sum leaving it.
D The power in a circuit is conserved.

Which of the following is a passive electrical component?

A Diode
B Resistor
C Transistor
D Battery

Which of the following is a renewable energy source?

A Coal
B Nuclear power
C Solar power
D Natural gas

What is the formula for electrical power?

A P = I R
B P = V / R
C P = V I
D P = V / R

What is the direction of conventional current flow in a circuit?

A Positive to negative
B Negative to positive
C Random direction
D No specific direction