Fundamentals of Electric Circuits MCQs (Part-10)

What does **power factor correction** help improve in an electrical circuit?

A The voltage drop across components
B The efficiency of power usage by reducing losses
C The amount of energy stored in the circuit
D The current flow through the circuit

Which of the following is an example of a **passive component**?

A Resistor
B Diode
C Transistor
D Operational amplifier

Which component is considered an **active component** in an electrical circuit?

A Capacitor
B Resistor
C Transistor
D Inductor

What does **feedback** in an electrical circuit typically do?

A Increase the voltage across a component
B Stabilize and control the output of the circuit
C Decrease the current through the circuit
D Reduce the power consumed

What is the main function of **electrical filters** in circuits?

A To convert AC to DC
B To increase the current
C To pass certain frequencies while blocking others
D To amplify signals

What is an **equivalent circuit** used for in electrical analysis?

A To represent a circuit with only resistors
B To simplify a complex circuit for easier analysis
C To add more components to a circuit
D To increase the total resistance of a circuit

What is **energy transfer** in an electrical circuit?

A The conversion of electrical energy into heat
B The process of transferring energy from the source to the load
C The storage of energy in resistive components
D The dissipation of power as heat

What is the primary function of **digital circuits**?

A To process signals in continuous values
B To process signals in discrete values (0 and 1)
C To store energy
D To control the current in a circuit

In **circuit design**, what is a common technique to simplify complex circuits?

A Using more complex components
B Using equivalent circuits to represent parts of the system
C Avoiding the use of passive components
D Using more active components

What happens to the **current** in a **series circuit** when the resistance increases?

A The current increases
B The current decreases
C The current remains the same
D The current becomes zero

What is the **cutoff frequency** in an electrical filter?

A The frequency at which the impedance is zero
B The frequency at which the filter begins to pass the signal
C The maximum frequency the filter can pass
D The frequency at which power is minimized

What does **power factor correction** aim to reduce in an AC circuit?

A The resistance of the load
B The phase difference between current and voltage
C The voltage drop across the circuit
D The total power consumption

What is the role of **capacitors** in an electrical circuit?

A To store energy in an electric field
B To increase the current in the circuit
C To resist changes in current
D To store energy in a magnetic field

In an AC circuit, what happens to the **impedance** of a capacitor as the frequency increases?

A It increases
B It decreases
C It remains the same
D It becomes zero

What is the **resonance** frequency in an RLC circuit determined by?

A The voltage of the circuit
B The values of resistance, inductance, and capacitance
C The total current in the circuit
D The phase angle between current and voltage

What is the **phase shift** between current and voltage in a purely resistive AC circuit?

A 0 degrees
B 45 degrees
C 90 degrees
D 180 degrees

What is the **energy transfer** in an electrical circuit?

A The conversion of electrical energy into heat
B The process of transferring energy from the source to the load
C The storage of energy in resistive components
D The dissipation of power as heat

What is the primary function of **digital circuits**?

A To process signals in continuous values
B To process signals in discrete values (0 and 1)
C To store energy
D To control the current in a circuit

In **circuit design**, what is a common technique to simplify complex circuits?

A Using more complex components
B Using equivalent circuits to represent parts of the system
C Avoiding the use of passive components
D Using more active components

What happens to the **current** in a **series circuit** when the resistance increases?

A The current increases
B The current decreases
C The current remains the same
D The current becomes zero