Fundamentals of Electric Circuits MCQs (Part-7)

What does transient analysis in an electrical circuit focus on?

A Circuit behavior during steady-state
B Circuit behavior after a sudden change in conditions
C Current and voltage at peak values
D The energy stored in inductive components

What is the steady-state condition in an electrical circuit?

A The voltage and current are changing continuously
B The current and voltage reach constant values
C The current is zero
D The components store energy

In an AC circuit, what is the purpose of using phasors?

A To simplify voltage measurements
B To represent sinusoidal waveforms as complex numbers
C To analyze DC circuits
D To calculate the total energy stored

What does impedance in an AC circuit combine?

A Resistance and capacitance
B Resistance and voltage
C Resistance and reactance
D Reactance and current

What is the purpose of admittance in AC circuits?

A To represent how easily current flows through a circuit
B To calculate voltage drops
C To measure resistance in an AC circuit
D To store energy in the circuit

How does the resonance in an RLC circuit affect current?

A It increases the impedance
B It maximizes the current
C It decreases the current
D It reduces the frequency

What happens to the impedance in a purely inductive AC circuit?

A It decreases with frequency
B It increases with frequency
C It is constant
D It is zero

In a series RLC circuit at resonance, what is the total impedance?

A Maximum
B Equal to the resistance
C Infinite
D Zero

What is the formula for calculating the impedance of a series RLC circuit?

A Z = R + XL + XC
B Z = √(R² + (XL – XC)²)
C Z = R + j(XL – XC)
D Z = R + j(XC – XL)

What is the impact of resonance in an RLC circuit on the impedance?

A The impedance is minimized
B The impedance is maximized
C The impedance is constant
D The impedance becomes zero

What is the primary purpose of **admittance** in AC circuit analysis?

A To represent how easily current flows through the circuit
B To calculate the total power in the circuit
C To store energy in the circuit
D To calculate the resistance

What is the result of adding more resistors in **series** with the existing resistors?

A The total resistance increases
B The total resistance decreases
C The total current decreases
D The total current increases

What is the effect of increasing the frequency in a **capacitive** AC circuit?

A The capacitive reactance increases
B The capacitive reactance decreases
C The impedance increases
D The voltage increases

What is the effect of resonance on current in an **RLC** circuit?

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

In a **resonant** RLC circuit, what happens to the impedance when the frequency is above resonance?

A The impedance increases
B The impedance decreases
C The impedance remains the same
D The current increases

What is the result of **adding more resistors in parallel** in an AC circuit?

A The total current decreases
B The total current increases
C The total impedance decreases
D The voltage increases

What does the **power factor** in an AC circuit tell you?

A The efficiency of the circuit in using power
B The voltage drop in the circuit
C The total current
D The energy storage capacity

What is the total current in a **parallel circuit** when the total resistance decreases?

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

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

A To increase or decrease voltage
B To store electrical energy
C To regulate the current
D To convert AC to DC

What happens to the **total impedance** in a series RLC circuit when the frequency is below resonance?

A The impedance decreases
B The impedance increases
C The current decreases
D The current increases