Thursday, September 27, 2012

Basic Electronics [Circuits Frequency Response] Objectives

Circuits Frequency Response Objective Questions:

[1] Consider the parallel RLC circuit having R= 1, L= 1H, C=1F . What type of response will the circuit produce?
A. Under damped
B. Over damped
C. Critically damped
D. None of these

[2] How much inductance is needed to resonate at 5 kHz with a capacitance of 12nF?
A. 2652 H
B. 11.844 H
C. 3.333 H
D. 84.33 mH

[3] The difference between the half power frequencies is called the
A. Quality factor
B. Resonant frequency
C. Bandwidth
D. Cutoff frequency

[4] A parallel RLC circuit has C=0.25F & L=2H. The value of R which will create unity damping factor is
A. 1
B. 2
C. 0.5
D. 4

[5] A zero of the transfer function
H(s) =  ------------
is at
A. 10
B. -1
C. -2
D. -3

[6] On the Bode magnitude plot, the slope of the pole 1/(5 + jω)is
A. 20 dB/decade
B. 40 dB/decade
C. - 40 dB/decade
D. -20 dB/decade

[7] On the bode phase plot, the slope of [1 + j10ω - ω2/25]2 is
A. 45°/decade
B. 90°/decade
C. 135°/decade
D. 180°/decade

[8] In an electric circuit, the dual of resistance is
A. Conductance
B. Capacitance
C. Open circuit
D. Inductance

[9] In a series RLC circuit, which of these quality factors has the steepest curve at resonance?
A. Q = 20
B. Q = 12
C. Q = 8
D. Q = 4

[10] In a parallel RLC circuit, the bandwidth B is directly proportional to R
A. True
B. False

9:07 PM


  1. Hi. Shouldn't the answer to question 9 be (A) since for series resonance, a steep curve (i.e. narrow bandwidth) implies high quality factor?
    **Alexander, C. and Sadiku M. Fundamentals of Electric Circuits, 5th 664, question 14.6.