Fundamentals of Electric Circuits MCQs (Part-8)

What is the primary focus of transient analysis in electrical circuits?

A The behavior of the circuit when conditions are stable
B The behavior of the circuit immediately after a sudden change
C The behavior of the circuit after a voltage source is turned off
D The average current in the circuit

What is the definition of steady-state in an electrical circuit?

A The condition where the voltage and current are constantly changing
B The condition where the current and voltage reach constant values
C The point at which the circuit loses energy
D The time when the energy stored in the circuit is at its peak

What is the primary purpose of using phasors in AC circuit analysis?

A To calculate the total power consumed
B To represent sinusoidal waveforms as complex numbers
C To calculate the total energy stored
D To represent complex DC circuits

In an AC circuit, what does impedance represent?

A The total power in the circuit
B The total resistance to current flow, including reactance
C The energy stored in the circuit
D The total capacitance of the circuit

How is admittance related to impedance?

A Admittance is the inverse of impedance
B Admittance is the same as impedance
C Admittance is the sum of impedance and resistance
D Admittance is the reciprocal of resistance

What does resonance in a series RLC circuit result in?

A Maximum impedance and minimum current
B Maximum current and minimum impedance
C Equal voltage across all components
D Minimum power consumption

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

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

What is the result of a parallel combination of resistors?

A The total resistance increases
B The total resistance decreases
C The total resistance remains the same
D The current stays constant

In an AC circuit, what happens when the power factor increases?

A The circuit becomes more efficient
B The voltage across the components decreases
C The impedance increases
D The current becomes zero

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

A To increase or decrease frequency
B To change voltage levels
C To store electrical energy
D To convert AC to DC

What is the unit of inductance?

A Volt
B Ampere
C Henry
D Ohm

What happens in an AC circuit when the frequency of the signal increases?

A The impedance of a capacitor decreases
B The impedance of an inductor decreases
C The current decreases
D The total voltage increases

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

A The current and voltage are in phase
B The current leads the voltage by 90 degrees
C The current lags the voltage by 90 degrees
D The current is zero

What happens to the total power in an AC circuit with a power factor of 1?

A The circuit becomes 100% efficient
B The current is zero
C The voltage is zero
D The impedance becomes zero

What is the main role of a capacitor in a DC circuit after a long time?

A It behaves like an open circuit
B It behaves like a short circuit
C It allows current to flow continuously
D It blocks all current

What is the effect of increasing impedance in a circuit?

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

What is the effect of resonance on current in a series RLC circuit?

A The current increases
B The current decreases
C The current remains constant
D The current becomes zero

What happens in a parallel circuit when more resistors are added?

A The total current decreases
B The total current increases
C The total resistance increases
D The voltage across each component decreases

What does the power factor in an AC circuit measure?

A The ratio of voltage to current
B The ratio of real power to apparent power
C The current in the circuit
D The phase difference between current and voltage

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

A To store energy
B To change voltage levels
C To convert AC to DC
D To regulate current