GROL Electrical Principles and Units 4

Question 1

What is the resonant frequency of a circuit with L = 100 μH and C = 100 pF?

Accepted Answer

1.59 MHz

Answer

159 kHz

Answer

15.9 MHz

Answer

159 MHz

Question 2

At resonance in a series RLC circuit, the total impedance equals:

Accepted Answer

The resistance R alone

Answer

Zero

Answer

XL plus XC

Answer

√(R² + XL²)

Question 3

How is the Q factor of a series resonant circuit defined?

Accepted Answer

Q = XL/R

Answer

Q = R/XL

Answer

Q = R × XL

Answer

Q = XL × XC

Question 4

A resonant circuit has a center frequency of 1 MHz and a 3-dB bandwidth of 10 kHz. What is its Q factor?

Accepted Answer

100

Answer

10

Answer

1000

Answer

0.01

Question 5

What is the RMS value of a sine wave with a peak voltage of 170 V?

Accepted Answer

120 V

Answer

85 V

Answer

170 V

Answer

240 V

Question 6

In a purely capacitive AC circuit, the current phase relationship to voltage is:

Accepted Answer

Current leads voltage by 90°

Answer

Current lags voltage by 90°

Answer

Current and voltage are in phase

Answer

Current leads voltage by 45°

Question 7

Power factor is equal to:

Accepted Answer

True power divided by apparent power

Answer

Apparent power divided by reactive power

Answer

Reactive power divided by true power

Answer

True power multiplied by impedance