AC Circuit

All of the following have the same units except:

• inductance.

• capacitive reactance.

• impedance.

• resistance.

A resistor is connected to an AC power supply. On this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers

A pure inductor is connected to an AC power supply. In this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers.

If the frequency of the AC voltage across an inductor is doubled, the inductive reactance of that inductor

• increases to 4 times its original value.

• increases to twice its original value.

• decreases to one-half its original value.

• decreases to one-fourth its original value.

A pure capacitor is connected to an AC power supply. In this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers

What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?

• zero

• 90°

• 180°

• 270°

Which one of the below AC parameters show the effective Dc value?

• Peak Value

• RMS value

• Peak to peak value

• Frequency

A sine wave has a peak value of 354 V, What is the RMS value?

• 250 V

• 500 V

• 354 V

• 200V

The opposition to AC current flow presented by capacitors and inductors is called:

• Resistance

• Reactance

• Impedance

• Reluctance

An alternating voltage has the equation v = 141.4 sin 377t . Determine the frequency.

• 40 Hz

• 50 Hz

• 60 Hz

• 70 Hz