# Competitive Exams: Electronics MCQs (Practice-Test 3 of 13)

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1. Consider the parallel RLC circuit having R = 1, L = 1H, C = 1F. What type of response will the circuit produce?

1. Under damped

2. Over damped

3. Critically damped

4. none of these

Answer: a

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

1. 2652 H

2. 11.844 H

3. 3.333 H

4. 84.33 mH

Answer: d

3. The difference between the half power frequencies is called the

1. quality factor

2. resonant frequency

3. bandwidth

4. cutoff frequency

Answer: c

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

1. 1

2. 2

3. 0.5

4. 4

Answer: b

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

1. 10

2. -1

3. -2

4. -3

Answer: b

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

1. 20 dB/decade

2. 40 dB/decade

3. -40 dB/decade

4. -20 dB/decade

Answer: c

7. On the bode phase plot, the slope of [1 + j10w-w2/25]^2 is

1. 45° /decade

2. 90° /decade

3. 135° /decade

4. 180° /decade

Answer: d

8. In an electric circuit, the dual of resistance is

1. conductance

2. capacitance

3. open circuit

4. inductance

Answer: a

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

1. Q = 20

2. Q = 12

3. Q = 8

4. Q = 4

Answer: d