Q.1

The Q of a crystal _________.

  • is extremely low
  • is about 40 or so in most cases
  • is extremely high
  • none of the above
Q.2

All of the following are basic op-amp input modes of operation EXCEPT

  • inverting mode
  • common-mode
  • double-ended
  • single-ended
Q.3

In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:

  • swing negative
  • close the loop
  • be balanced
  • swing positive
Q.4

How many leads does the TO-5 metal can package of an operational amplifier have?

  • 8, 10, or 12
  • 6, 8, or 10
  • 8 or 14
  • 8 or 16
Q.5

The voltage follower has a:

  • closed-loop voltage gain of unity
  • small open-loop voltage gain
  • closed-loop bandwidth of zero
  • large closed-loop output impedance
Q.6

A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?

  • common-mode
  • darlington
  • differential
  • operational
Q.7

With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?

  • –87.9 dB
  • –43.9 dB
  • 43.9 dB
  • 87.9 dB
Q.8

If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?

  • 3.5 mV
  • ground
  • 1.42 mV
  • 0.56 mV
Q.9

The ratio between differential gain and common-mode gain is called:

  • amplitude
  • differential-mode rejection
  • common-mode rejection
  • phase
Q.10

With negative feedback, the returning signal

  • is proportional to the output current
  • is proportional to the differential voltage gain
  • opposes the input signal
  • aids the input signal
Q.11

If the input to a comparator is a sine wave, the output is a:

  • ramp voltage
  • sine wave
  • rectangular wave
  • sawtooth wave
Q.12

What three subcircuits does a phase locked loop (PLL) consist of?

  • phase comparator, comparator, and VCO
  • phase comparator, bandpass filter, and VCO
  • phase comparator, bandpass filter, and demodulator
  • phase comparator, low-pass filter, and VCO
Q.13

Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:

  • Ri
  • Rf + Ri
  • ∞
  • Rf – Ri
Q.14

If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

  • 6240 ohms
  • 2.4 kilohms
  • 410 ohms
  • 0.62 kilohms
Q.15

The major difference between ground and virtual ground is that virtual ground is only a:

  • voltage reference
  • current reference
  • power reference
  • difference reference
Q.16

The closed-loop voltage gain of an inverting amplifier equals:

  • the ratio of the input resistance to the feedback resistance
  • the open-loop voltage gain
  • the feedback resistance divided by the input resistance
  • the input resistance
Q.17

What is the output waveform?

  • sine wave
  • square wave
  • +15 V
  • –15 V
Q.18

If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

  • 6240 ohms
  • 2.4 kilohms
  • 410 ohms
  • 0.62 kilohms
Q.19

If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

  • 6240 ohms
  • 2.4 kilohms
  • 410 ohms
  • 0.62 kilohms
Q.20

What is the output waveform?

  • sine wave
  • square wave
  • +15 V
  • –15 V
Q.21

What is the cutoff frequency of this low-pass filter?

  • 4.8 kHz
  • 3.8 kHz
  • 2.8 kHz
  • 1.8 kHz
Q.22

If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will:

  • not need an input resistor
  • be virtual ground
  • have high reverse current
  • not invert the signal
Q.23

An astable multivibrator is also known as a:

  • one-shot multivibrator
  • free-running multivibrator
  • bistable multivibrator
  • monostable multivibrator
Q.24

If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?

  • Common-mode
  • Single-ended
  • Double-ended
  • Noninverting mode
Q.25

A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio ofWhat would the output voltage be if the single-ended input voltage was 7 mV rms?

  • 1.4 mV rms
  • 650 mV rms
  • 4.55 V rms
  • 0.455 V rms
Q.26

The common-mode voltage gain is

  • smaller than differential voltage gain
  • equal to voltage gain
  • greater than differential voltage gain
  • None of the above
Q.27

With negative feedback, the returning signal:

  • aids the input signal
  • is proportional to output current
  • opposes the input signal
  • is proportional to differential voltage gain
Q.28

If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?

  • 7.82 V
  • saturation
  • cutoff
  • 9.52 V
Q.29

An ideal operational amplifier has

  • infinite output impedance
  • zero input impedance
  • infinite bandwidth
  • All of the above
Q.30

The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:

  • the ratio of the input resistance to the feedback resistance
  • the open-loop voltage gain Aol
  • the feedback resistance divided by the input resistance
  • the input resistance
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