PS 9 A-C

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°

A capacitor 120 µF is connected to an AC source of 6 V with frequency 100 Hz. If the frequency is increased to 200 Hz, the reactance of the capacitor will be

• half the original value.

• same as the original value.

• two times the original value.

• the reciprocal of the original value.

If an electric bulb is connected to an AC source, which of the following statement is true about the phase difference between the voltage across the bulb and current flowing in it?

• In phase.

• Not in phase.

• The voltage is leading the current.

• The current is leading the voltage.

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