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Understanding AC Circuits

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12th Grade

Understanding AC Circuits
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15 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for calculating impedance in an AC circuit?

Z = √(R² + X²)

Z = R / X

Z = R - X

Z = R + jX

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the impedance of a circuit change with frequency?

Impedance decreases with frequency for inductors and increases for capacitors.

Impedance increases with frequency for both capacitors and inductors.

Impedance remains constant regardless of frequency.

Impedance decreases with frequency for capacitors and increases with frequency for inductors.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is resonance in an RLC circuit?

Resonance in an RLC circuit is the condition where inductive and capacitive reactances are equal, leading to maximum current at the resonant frequency.

Resonance is when the circuit has only resistive components.

Resonance occurs when the circuit is powered by a DC source.

Resonance happens at any frequency regardless of reactance.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the condition for resonance in an RLC circuit?

The condition for resonance is R = L.

The condition for resonance is XL = XC.

The condition for resonance is XL > XC.

The condition for resonance is XC = 0.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you calculate the quality factor (Q) of a resonant circuit?

Q = R * √(C/L)

Q = L / (R * C)

Q = f0 / Δf or Q = (1/R) * √(L/C)

Q = Δf / f0

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the significance of power factor in AC circuits?

Power factor indicates the efficiency of power usage in AC circuits.

Power factor is only relevant in DC circuits.

Power factor determines the frequency of the AC supply.

Power factor measures the voltage in AC circuits.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you calculate real power, reactive power, and apparent power in AC circuits?

P = VIsin(φ), Q = VIcos(φ), S = V/2

Real power (P), Reactive power (Q), and Apparent power (S) are calculated using P = VIcos(φ), Q = VIsin(φ), and S = VI respectively.

P = VI/2, Q = VI/3, S = VI/4

P = V^2/R, Q = V^2/X, S = V^2/Z

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