Linear Integrated Circuit MCQ [Free PDF] – Objective Question Answer for Linear Integrated Circuit Quiz

21. Why the gain magnitude in the frequency response plot is expressed in decibels (dB.

A. To obtain gain > 105
B. To obtain gain < 105
C. To obtain gain = 0
D. To obtain gain = ∞

Answer: A

In the frequency response plot, gain magnitude is assigned a linear scale and is expressed in decibels to accommodate very high gain ( ≅ of the order 105 or higher).


22. Which technique is used to determine the stability of op-amp?

A. Frequency response plot
B. Transient response plot
C. Bode plot
D. All of the mentioned

Answer: C

Although frequency response and bode plots indicate the effect of frequency variation on gain, the Bode plot is generally used for stability determination and network design.


23. How many types of plots can be obtained in the AC analysis of the network using the Bode plot?

A. Five
B. Four
C. Three

Answer: D

Two types of plots can be obtained using the Bode plot. They are magnitude versus frequency and phase angle versus frequency plots.


24. What happens when the operating frequency of op-amp increases?

A. Gain of the amplifier decrease
B. Phase shift between output and input signal decrease
C. Gain and phase shift of amplifier decreases
D. None of the mentioned

Answer: A

When the operating frequency has increased the gain of the amplifier decrease. As it is linearly related to frequency, the phase shift is logarithmically related to frequency.


25. Which of the following causes change in gain and phase shift?

A. Internally integrated Resistor
B. Internally integrated inductors
C. Internally integrated Capacitor
D. All of the mentioned

Answer: C

The change in function of frequency is attributed to the internally integrated capacitor as well as a stray capacitor. These capacitors are due to the physical characteristic of the semiconductor device.


26. Which plot is not provided by the manufacturers?

A. Magnitude plot
B. Phase angle plot
C. Frequency response plot
D. None of the mentioned

Answer: B

Phase angle plots are not generally provided because phase shifts of later generation op-amp are less than 90o even at cross-over frequency.


27. Open-loop bandwidth of an op-amp extends its bandwidth from

A. 0 Hz to fo
B. 20dB to fo
C. 3dB to fo
D. 0.704dB to fo

Answer: A

The gain of the op-amp remains essentially constant from 0 to the break frequency fo and therefore rolls off at a constant rate of 20dB per decade. Thus, the open-loop bandwidth is the frequency band extending from 0Hz to fo.


28. What happens if 741 op-amps are configured as a closed-loop inverting amplifier?

A. Gain increases
B. Gain roll-off at a rate of 20dB/decade
C. No gain roll-off takes place
D. Gain decreases

Answer: B

Whether the op-amp is inverting / non-inverting the gain will always roll off at a rate of 20dB/decade, using only resistive components regardless of the value of its closed-loop gain.


29. Op-amp requiring external compensating components is called as

A. Tailored frequency response op-amp
B. Compensating op-amp
C. Transient op-amp
D. High-frequency op-amp

Answer: A

Op-amps using external components like resistor and capacitor to form the compensating network are sometimes called tailored frequency response op-amps because the user has to provide the compensation if it is needed to tailor the response.


30. In the first generation op-amp 709c, the open-loop bandwidth of gain versus frequency curve

A. Increases from the innermost compensated curve to the outermost
B. Decrease from the innermost compensated curve to the outermost
C. Increases from the outermost compensated curve to the innermost
D. Decreases from the outermost compensated curve to the innermost

Answer: D

The gain versus frequency curve of 709c decreases from the outermost compensated curve to the innermost.

For example, if C1 =10pF, R1 = 0Ω and C2 = 3pF, the bandwidth ≅ 5kHz.

While if C1 =5000pF, R1 =1.5Ω and C2= 200pF, the bandwidth will be 100Hz.

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