Q.1

Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.

  • does not change
  • doubles for every 1 kHz increase in frequency
  • increases
  • decreases
Q.2

A mathematical operation that determines the rate of change of a curve is called __________.

  • differentiation
  • integration
  • curve averaging
  • linear regression
Q.3

In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______.

  • reduced, equals one
  • reduced, is less than one
  • increased, is more than one
  • increased, is much greater than one
Q.4

A Wien-bridge oscillator uses _________.

  • positive feedback
  • negative feedback
  • both types of feedback
  • an LC tank circuit
Q.5

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

  • ramp voltage
  • sine wave
  • rectangular wave
  • sawtooth wave
Q.6

The ______________ input makes the summing amplifier circuit possible.

  • virtual ground at the noninverting
  • virtual ground at the inverting
  • low-voltage
  • high-voltage
Q.7

A triangular-wave oscillator can consist of an op-amp comparator, followed by a(n)

  • differentiator
  • amplifier
  • integrator
  • multivibrator
Q.8

The center frequency of a band-pass filter is always equal to the

  • bandwidth
  • –3 dB frequency
  • bandwidth divided by Q
  • geometric average of the critical frequencies
Q.9

To operate properly, an oscillator requires an external ac input signal.

  • True
  • False
Q.10

The feedback component in an op-amp integrator is a capacitor.

  • True
  • False
Q.11

A mathematical operation for finding the area under the curve of a graph is called __________.

  • differentiation
  • integration
  • curve averaging
  • linear regression
Q.12

A basic series regulator has

  • an error detector
  • a load
  • a reference voltage
  • both an error detector and a reference voltage
Q.13

The ramp voltage at the output of an op-amp integrator

  • increases or decreases at a linear rate
  • increases or decreases exponentially
  • is always increasing and never decreasing
  • is constant
Q.14

A zero-level detector is a

  • comparator with a sine-wave output
  • comparator with a trip point referenced to zero
  • peak detector
  • limiter
Q.15

For a Wien-bridge oscillator to produce a sustained sine-wave output, the phase shift around the positive feedback loop must be greater than 0°.

  • True
  • False
Q.16

When the capacitance in an active high-pass filter increases, the critical frequency decreases.

  • True
  • False
Q.17

A comparator is an example of a(n)

  • active filter
  • current source
  • linear circuit
  • nonlinear circuit
Q.18

A two-pole high-pass active filter would have a roll-off rate of

  • 40 dB/decade
  • –40 dB/decade
  • 20 dB/decade
  • –20 dB/decade
Q.19

A digital-to-analog converter is an application of the

  • scaling adder
  • voltage-to-current converter
  • noninverting amplifier
  • adjustable bandwidth circuit
Q.20

The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating.

  • True
  • False
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