Introduction to Electrical Engineering MCQs (Part-10)

Which electrical quantity is measured in amperes?

A Voltage
B Current
C Resistance
D Capacitance

What happens to the total capacitance when capacitors are connected in parallel?

A It increases
B It decreases
C It remains constant
D It becomes zero

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

A To increase voltage
B To store electrical energy
C To limit current flow
D To step up current

Which device converts mechanical energy into electrical energy?

A Motor
B Generator
C Rectifier
D Transformer

What does a capacitor do in a DC circuit?

A Blocks DC and allows AC
B Blocks AC and allows DC
C Increases resistance
D Amplifies voltage

What is the unit of power in an electrical system?

A Joule
B Watt
C Volt
D Ampere

What happens to the magnetic field strength inside a coil when the current is increased?

A Increases
B Decreases
C Remains the same
D Becomes zero

What is the function of a rectifier?

A Convert DC to AC
B Convert AC to DC
C Store electrical energy
D Increase current

Which law states that the induced EMF opposes the change in magnetic flux?

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

What is the purpose of a circuit breaker?

A Store charge
B Prevent overloading or short circuits
C Measure current
D Increase voltage

What is the SI unit of inductance?

A Ohm
B Tesla
C Henry
D Farad

What does a zener diode primarily do in a circuit?

A Amplifies current
B Converts AC to DC
C Stabilizes voltage
D Regulates current

What is the purpose of an ammeter?

A To measure voltage
B To measure resistance
C To measure current
D To measure power

What is the typical value of AC supply voltage in households in India?

A 110 V
B 220 V
C 240 V
D 50 V

Which of the following is NOT a renewable energy source?

A Solar power
B Wind power
C Fossil fuels
D Hydropower

What is the main purpose of a signal generator?

A Measure voltage
B Generate waveforms for testing
C Store electrical energy
D Increase current

Which of the following is a good conductor of electricity?

A Rubber
B Glass
C Copper
D Wood

What does the term “short circuit” refer to?

A A circuit with low resistance causing high current flow
B A circuit with high resistance blocking current
C A circuit with no voltage
D A disconnected circuit

What is the purpose of an isolator in electrical systems?

A Increase voltage
B Protect against overcurrent
C Disconnect a circuit for maintenance
D Store electrical energy

What does the term “electric potential difference” refer to?

A The force between two charges
B The work done to move a charge between two points
C The opposition to current flow
D The power dissipated in a circuit