# Rlc Circuits And Resonance MCQs

## At any resonant frequency, what voltage is measured across the two series reactive components?

• A. applied
• B. reactive
• C. zero
• D. inductive and capacitive

## At frequencies well above and below the resonant frequency, the series RLC circuit looks ______ and the parallel RLC circuit looks ______.

• A. like a short, like an open
• B. like an open, like a short
• C. inductive, capacitive
• D. capacitive, inductive

• A. 50
• B. 62.3
• C. 70.7
• D. 95.3

## Current in a series RLC circuit may always be used as:

• B. a reference
• C. an angle
• D. a lagging vector

• A. 1.05 A
• B. 303 mA
• C. 247 mA
• D. 107 mA

## If the bandwidth of a filter increases:

• A. Q decreases
• B. the roll-off rate increases
• C. the half-power frequency decreases
• D. the center frequency decreases

## Series RLC voltage or impedance totals must be calculated by:

• A. subtracting the values
• B. graphing the angles
• D. multiplying the values

## Voltage lags current in an RLC circuit when it acts:

• A. capacitively
• B. resistively
• C. inductively
• D. resonantly

## What effect will a parallel tank have upon final filter current?

• A. very little
• B. The bandpass frequencies will change.
• C. The frequency cutoff will change.
• D. The impedance will block output.

• A. 3.00 V
• B. 12.37 V
• C. 34.98 V
• D. 48.00 V

## What is the approximate phase angle in a series RLC circuit when VC = 117 V, VR = 14.5 V, and VL = 3.3 V?

• A. –45.0 degrees
• B. –82.7 degrees
• C. –90.0 degrees
• D. –172.7 degrees

## What is the band pass (F1 – F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?

• A. 100.0 kHz to 155.0 kHz
• B. 147.5 kHz to 152.5 kHz
• C. 295.5 kHz to 4500 kHz
• D. 149,970 Hz to 150,030 Hz

## What is the current phase angle for a parallel RLC circuit when IL = 15.3 A, IC = 0.43 A, and IR = 3.5 A?

• A. 76.7 degrees
• B. –4.25 degrees
• C. 88.8 degrees
• D. –76.7 degrees

• A. 2125 Hz
• B. 2250 Hz
• C. 1750 Hz
• D. 8.0 Hz

• A. 0.001
• B. 50
• C. 80
• D. 4.0

## What is the range between f1 and f2 of an RLC circuit that resonates at 150 kHz and has a Q of 30?

• A. 100.0 kHz to 155.0 kHz
• B. 147.5 kHz to 152.5 kHz
• C. 4500 kHz to 295.5 kHz
• D. 149,970 Hz to 150,030 Hz

## What is the total impedance of a 60 Hz series RLC circuit when XL = 7.5 ohms, XC = 265.3 ohms, and R = 33 ohms?

• A. 257.8 ohms
• B. 259.9 ohms
• C. 290.8 ohms
• D. 1989.75 ohms

## What is the true power consumed in a 30 V series RLC circuit if Z = 20 ohms and R = 10 ohms?

• A. 15.0 watts
• B. 22.5 watts
• C. 30.0 watts
• D. 45.0 watts

## What would be the power factor for an RLC circuit that acts inductively?

• B. one
• C. zero
• D. –90 degrees lagging

## When a full band of frequencies is allowed to pass through a filter circuit to the output, the resonant circuit is called a:

• A. low-pass filter
• B. high-pass filter
• C. band-stop filter
• D. bandpass filter

## When a parallel circuit resonates it is said to:

• A. flywheel
• B. oscillate
• C. both of the above
• D. none of the above

• A. band-stop
• B. low-pass
• C. bandpass
• D. high-pass