AFCAT: Electronics MCQs (PracticeTest 3 of 13)
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Consider the parallel RLC circuit having R = 1, L = 1H, C = 1F. What type of response will the circuit produce?

Under damped

Over damped

Critically damped

none of these
Answer: a


How much inductance is needed to resonate at 5 kHz with a capacitance of 12nF?

2652 H

11.844 H

3.333 H

84.33 mH
Answer: d


The difference between the half power frequencies is called the

quality factor

resonant frequency

bandwidth

cutoff frequency
Answer: c


A parallel RLC circuit has C = 0.25F & L = 2H. The value of R which will create unity damping factor is

1

2

0.5

4
Answer: b


A zero of the transfer function H (s) = 10 (s + 1)/(s + 2) (s + 3) is at

10

1

2

3
Answer: b


On the Bode magnitude plot, the slope of the pole 1/(5 + j?) 2 is

20 dB/decade

40 dB/decade

40 dB/decade

20 dB/decade
Answer: c


On the bode phase plot, the slope of [1 + j10ww^{2}/25]^2 is

45° /decade

90° /decade

135° /decade

180° /decade
Answer: d


In an electric circuit, the dual of resistance is

conductance

capacitance

open circuit

inductance
Answer: a


In a series RLC circuit, which of these quality factors has the steepest curve at resonance?

Q = 20

Q = 12

Q = 8

Q = 4
Answer: d
