AC Circuits Quiz 2

Question 1

If AC voltage is applied to a pure capacitor, then voltage acrose the capacitor.

Accepted Answer

lags behind the current by phase angle $(\frac{\pi}{2})$ rad

Answer

leads the current by phase angle $(\frac{\pi}{2} )$ rad

Answer

leads the current by phase angle $\pi$ rad

Answer

lags behind the current by phase angle $\pi$ rad

Question 2

In a series LCR circuit at resonance, the phase difference between the current and emf of the source is

Accepted Answer

zero rad.

Answer

$\pi \ rad$

Answer

$\frac{\pi}{2} \ rad$

Answer

$\frac{\pi}{4} \ rad$

Question 3

For $e = e_0 sin \ \omega t$, (average) over one cycle is

Accepted Answer

$\frac{2}{\pi} e_0$

Answer

$\frac{\pi}{2} e_0$

Answer

$\frac{e_0}{\sqrt2}$

Answer

$\frac{e_0}{\pi}$

Question 4

For $i = i_0 \ sin \ \omega t. i_{rms} /i_{avg}$ is

Accepted Answer

$\pi/2 \sqrt 2$

Answer

$2 \sqrt 2 / \pi$

Answer

$\pi / \sqrt 2 $

Answer

$\sqrt 2 / \pi$

Question 5

If e = 10 sin(400t) [in volt]. $e_{rms}$ =

Accepted Answer

7.07 V

Answer

$\frac{10}{\pi} V$

Answer

$\frac{10 \sqrt2}{\pi} V$

Answer

5 V

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