PakQuizHub

1.In a series L-C circuit operating at its resonant frequency, what is the behavior of the current?

The current reaches its highest valueThe current drops to its lowest pointThe circuit's impedance peaksThe voltage across the capacitor is at its minimumNone of the above

2.In an alternating current (AC) circuit, which of the following statements is always true?

The apparent power exceeds the real powerThe reactive power surpasses the apparent powerThe real power is greater than the reactive powerThe reactive power is higher than the real powerNone of the above

3.How does the time constant of a capacitive circuit change with variations in capacitance and resistance?

It grows when both capacitance and resistance decreaseIt becomes larger as capacitance decreases and resistance increasesIt rises when capacitance increases but resistance decreasesIt increases when both capacitance and resistance increaseIt remains zero regardless of changes

4.How does the inductance of a coil change when the supply frequency increases?

5.What is true about the power in an ideal inductive circuit?

6.How does the time constant of an inductive circuit change with variations in inductance and resistance?

It grows when inductance rises and resistance fallsIt grows when both inductance and resistance increaseIt grows when both inductance and resistance decreaseIt grows when inductance decreases and resistance increasesIt remains zero

7.In an R-L-C circuit operating at resonance, the magnitude of the current primarily depends on which parameter?

The resistance value (R)The inductance value (L)The capacitance value (C)The combined values of resistance, inductance, and capacitanceThe current is zero at resonance

8.In a series R-L-C circuit, which component(s) can be adjusted to alter the resonance frequency?

9.What is the formula for the time constant in a series resistor-capacitor (R-C) circuit?

10.When does a purely inductive circuit absorb power from an alternating current source?

The voltage applied drops while the current risesThe voltage applied rises while the current fallsBoth the applied voltage and current increase simultaneouslyBoth the applied voltage and current decrease simultaneouslyNone of the above

11.Which component in an electrical circuit resists variations in voltage?

12.What is the power factor of an electric bulb?

13.In an electrical circuit, the time constant represents the duration in seconds after voltage is applied for the response to reach what fraction of its final value?

14.What is the maximum current that a human body can safely tolerate for over three seconds?

15.In an R-L series circuit with a resistance of 20 Ω and an inductance of 27 H, what is the time constant of the circuit?

16.Which of the following statements accurately describe power behavior in an R-L-C circuit?

Power is dissipated in the resistor and is equal to I squared times R.Power is alternately exchanged between the inductor and the power source.The capacitor and the power supply exchange power back and forth.No power exchange occurs between the resistor and the power supply line.All of the above statements are true.

17.Given a sinusoidal current with a frequency of 50 Hz and an RMS value of 30 A, which of the following expressions correctly describes this waveform?

18.Which type of coil exhibits a higher resonant frequency?

A coil possessing high electrical resistanceA coil characterized by minimal resistanceA coil having significant distributed capacitanceA coil with minimal distributed capacitanceNone of the above

A.C. Fundamentals, Circuits and Circuit Theory – MCQs