Fundamentals of Electric Circuits MCQs (Part-11)

What is the purpose of power factor correction in an electrical system?

A To reduce the total voltage
B To reduce energy losses by aligning the phase of current and voltage
C To store excess energy in capacitors
D To convert AC to DC

Which of the following is an example of a passive component in an electrical circuit?

A Diode
B Transistor
C Resistor
D Integrated Circuit

What is the main characteristic of active components?

A They store energy
B They amplify or switch signals
C They do not consume power
D They only resist current flow

What is the role of feedback in an electronic amplifier circuit?

A To regulate the voltage
B To stabilize the circuit and reduce distortion
C To store energy
D To increase current

What is the purpose of electrical filters in a circuit?

A To allow only a single frequency to pass while blocking others
B To store electrical energy
C To convert AC to DC
D To increase the current

What does an equivalent circuit represent?

A A model that simplifies the analysis of a circuit
B A circuit with infinite resistance
C A circuit with only passive components
D A series combination of all components

What is energy transfer in an electrical circuit?

A The storage of energy in capacitors and inductors
B The process of moving energy from the source to the load
C The conversion of electrical energy into mechanical energy
D The dissipation of energy as heat

What is the role of digital circuits in electronics?

A To process signals in continuous values
B To process signals in discrete binary values (0 and 1)
C To store energy in inductive components
D To regulate power usage in the circuit

What is the main objective of circuit design techniques?

A To increase the power consumption of the circuit
B To make the circuit as simple as possible without compromising performance
C To store energy efficiently
D To decrease the impedance of the circuit

In a series circuit, what happens when additional resistors are added?

A The total resistance decreases
B The total resistance increases
C The voltage across each resistor remains the same
D The total current decreases

What happens to the impedance in a purely capacitive AC circuit as the frequency increases?

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

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

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

What is the cutoff frequency in an electrical filter?

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

What does power factor correction do to improve the efficiency of an electrical system?

A It minimizes the impedance of the circuit
B It aligns the phase between voltage and current
C It stores excess power in capacitors
D It increases the supply voltage

What is the main function of transistors in electrical circuits?

A To store energy
B To amplify or switch electronic signals
C To regulate power supply
D To control the frequency of signals

What happens when a capacitor is placed in series with a resistor in an AC circuit?

A The current becomes zero
B The capacitor blocks DC while allowing AC to pass
C The capacitor stores all the energy
D The voltage across the resistor and capacitor is equal

In a parallel circuit, what happens when resistors are added?

A The total resistance decreases
B The total resistance increases
C The total voltage decreases
D The current becomes zero

What is the primary purpose of diodes in circuits?

A To store electrical energy
B To allow current to flow in only one direction
C To resist current flow
D To amplify signals

How does resonance affect the impedance in a series RLC circuit?

A It increases the impedance
B It decreases the impedance to a minimum value
C It causes the current to be zero
D It increases the voltage

What does an inductor store in an AC circuit?

A Energy in the form of an electric field
B Energy in the form of a magnetic field
C Energy in the form of a resistive element
D Energy in the form of a capacitive element