AC fundamentals

If v₁ = 30 sin(ωt + 10°) and v₂ = 20 sin(ωt + 50°), which of these statements are true?

• v₁ leads v₂

• v₂ leads v₁

• v₂ lags v₁

• v₁ lags v₂

• v₁ and v₂ are in phase

The impedance of a capacitor increases with increasing frequency.

• True

• False

The power consumed in a pure inductive circuit is ______

Peak factor for a sine wave is _____ (Note: answer with three decimal place accuracy)

A current is said to be alternating when it changes in

• magnitude

• direction

• both ‘a’ and ‘b’

• none of these

If the peak value of a sine wave is 100 V, then its RMS value will be

• 88 V

• 70.7 V

• 63.6 V

• 100 V

The phase angle difference between current and voltage is 90^o, the power will be ________

• minimum

• maximum

• zero

• VI

If one cycle of AC waveform occurs every millisecond, the frequency will be ________

• 100 Hz

• 1000 Hz

• 50 Hz

• 10 kHz