RLC Circuits and Resonance

Q1:
What is the current through the capacitor in the given circuit?

A 3.5 mA

B 5.5 mA

C 9 mA

D 11.4 mA

Q2:
What is the bandwidth in the given circuit. If the winding resistance of the coil is 12 omega.gif?

A 6.4 kHz

B 47.2 kHz

C 53.7 kHz

D 60.2 kHz

Q3: At any resonant frequency, what net voltage is measured across the two series reactive components?

A Applied voltage

B Reactive voltage

C Zero voltage

D
VL + VC voltage

Q4:
What is the voltage across the capacitor in the given circuit?

A 6.8 V

B 11.9 V

C 16.1 V

D 22.9 V

Q5: Series RLC voltage or impedance totals must be calculated by:

A subtracting the values

B graphing the angles

C adding vectors

D multiplying the values

Q6:
What is the power factor?

A 0.279

B 0.479

C 0.679

D 0.879

Q7: 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

Q8: When XC = XL the circuit:

A draws maximum current

B applied voltage is zero

C is at resonance

D draws minimum current

Q9:
What is the resonant frequency in the given circuit?

A 11.6 Hz

B 275.8 Hz

C 1.5 kHz

D 3.2 kHz

Q10: Which statement best describes reactance in a series RLC circuit?

A Capacitive reactance is always dominant.

B Inductive reactance is always dominant.

C Resistance is always dominant.

D The larger of the two reactances is dominant.

Q11:
What is the total current for the nonideal circuit in the given circuit. If it is at resonance?

A 0 A

B
284 mu.gif A

C 3.3 mA

D 38.5 mA

Q12: 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

Q13:
What is the impedance of the circuit?

A 12.2 k

B 14.5 k

C 17.8 k

D 20.3 k

Q14: Current in a series RLC circuit may always be used as:

A a leading vector

B a reference

C an angle

D a lagging vector

Q15: What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?

A 0.001

B 50

C 80

D 4.0

Q16:
What is the impedance of the circuit in the given circuit?

A
125.7 omega.gif

B
297.6 omega.gif

C
370.1 omega.gif

D
423.3 omega.gif

Q17: What would be the power factor for an RLC circuit that acts inductively?

A +90 degrees leading

B one

C zero

D –90 degrees lagging

Q18: 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

Q19: At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow?

A 50

B 62.3

C 70.7

D 95.3

Q20:
What is the resonant frequency in the given circuit?

A 6.5 kHz

B 53.7 kHz

C 107.4 kHz

D 18.1 MHz

Q21:
Series RLC impedance or voltage totals must always be calculated by

A adding values vectorially

B graphing the angles

C multiplying the values

D subtracting the values

Q22:
What is the impedance of the circuit in the given circuit?

A
1.05 komega.gif

B
1.33 komega.gif

C
2.19 komega.gif

D
3.39 komega.gif

Q23: Voltage lags current in an RLC circuit when it acts:

A capacitively

B resistively

C inductively

D resonantly

Q24:
What is the resonance frequency?

A 31.8 Hz

B 71 Hz

C 7.1 kHz

D 31.8 kHz

Q25: 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.

Q26:
What is the bandwidth of the circuit in the given circuit?

A 11.6 Hz

B 275.9 Hz

C 1.5 kHz

D 3.2 kHz

Q27:
What is the phase angle?

A
61.4º

B
28.5º

C
-28.5º

D
-61.4º

Q28:
What is the quality factor?

A 999

B 223

C 2.2

D 0.99

Q29: 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

Q30: 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

Q31:
What is the voltage across R1, C1, and L1?

A VR = 156 V, VC = 165 V, VL = 441 V

B VR = 178 V, VC = 187 V, VL = 503 V

C VR = 219 V, VC = 232 V, VL = 619 V

D VR = 260 V, VC = 276 V, VL = 735 V

Q32:
What is the total current?

A 15.6 mA

B 17.8 mA

C 21.9 mA

D 26.0 mA

Q33: <div class="Aptitude-td-qtxt table-responsive w-100">What is the total current?<br><br><img src="/_files/images/basic-electronics/complete/mcq9_1008_1.gif"></div>

A 56.6 mA

B 141 mA

C 191 mA

D 244 mA

Q34: What is the high cutoff frequency for an RLC circuit that resonates at 2000 Hz and has a bandwidth of 250 Hz?

A 2125 Hz

B 2250 Hz

C 1750 Hz

D 8.0 Hz

Q35: 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

Q36: In a parallel RLC circuit, which value may always be used as a vector reference?

A current

B reactance

C resistance

D voltage

Q37:
What is the bandwidth of the circuit?

A 31.8 Hz

B 32.3 Hz

C 142 Hz

D 7.2 kHz

Q38: When a parallel circuit resonates it is said to:

A flywheel

B oscillate

C both of the above

D none of the above

Q39: 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

Q40:
What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?

A 3.00 V

B 12.37 V

C 34.98 V

D 48.00 V

Q41: 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

Q42: In a series RLC circuit the current can be found using:

A

B

C both of the above

D none of the above

Q43:
How much current will flow in a series RLC circuit when VT = 100 V, XL = 160 omega.gif, XC = 80 omega.gif, and R = 60 omega.gif?

A 1 A

B 1 mA

C 6.28 A

D 10 A

Q44: At any resonant frequency, what voltage is measured across the two series reactive components?

A applied

B reactive

C zero

D inductive and capacitive

Q45:
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

Q46: How much current will flow in a 100 Hz series RLC circuit if VS = 20 V, RT = 66 ohms, and XT = 47 ohms?

A 1.05 A

B 303 mA

C 247 mA

D 107 mA


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