Q.1

What is the difference between common-mode and differential-mode input signals?

  • phase relationship
  • voltage
  • current
  • apparent power
Q.2

Current actually flows into or out of a virtual ground.

  • True
  • False
Q.3

The feedback resistor adds to the gain of an op-amp.

  • True
  • False
Q.4

A noninverting closed-loop op-amp circuit generally has a gain factor:

  • less than one
  • greater than one
  • of zero
  • equal to one
Q.5

How many logic states does an S-R flip-flop have?

  • 2
  • 3
  • 4
  • 5
Q.6

What starts a free-running multivibrator?

  • a trigger
  • an input signal
  • an external circuit
  • nothing
Q.7

If the frequency of an astable multivibrator is 54.86 kHz then its period is 1.82 s.

  • True
  • False
Q.8

The Schmitt trigger is a two-state device that is used for:

  • pulse shaping
  • peak detection
  • input noise rejection
  • filtering
Q.9

Another name for a unity gain amplifier is:

  • difference amplifier
  • comparator
  • single ended
  • voltage follower
Q.10

A circuit that uses an amplifier with passive filter elements is called a(n):

  • relaxation oscillator
  • signal generator
  • differential amplifier
  • active filter
Q.11

A voltage-follower op-amp has the output connected directly to the inverting input.

  • True
  • False
Q.12

The frequency of a crystal is dependent on how much voltage is applied to activate it.

  • True
  • False
Q.13

A 555 timer can be configured as an astable multivibrator.

  • True
  • False
Q.14

In order for an output to swing above and below a zero reference, the op-amp circuit requires:

  • a resistive feedback network
  • zero offset
  • a wide bandwidth
  • a negative and positive supply
Q.15

An output that is proportional to the addition of two or more inputs is from which type of amplifier?

  • differentiator
  • difference
  • summing
  • analog subtractor
Q.16

In a PLL, to obtain lock, the signal frequency must:

  • come within the lock range
  • be less than the capture frequency
  • come within the capture range
  • be greater than the capture frequency
Q.17

A portion of the output that provides circuit stabilization is considered to be:

  • negative feedback
  • distortion
  • open-loop
  • positive feedback
Q.18

An open feedback resistor in an inverting or noninverting op-amp circuit can cause severe clipping of the output signal.

  • True
  • False
Q.19

Feedback is used in an open-loop operational amplifier circuit.

  • True
  • False
Q.20

When a capacitor is used in place of a resistor in an op-amp network, its placement determines:

  • open- or closed-loop gain
  • integration or differentiation
  • saturation or cutoff
  • addition or subtraction
Q.21

An operational amplifier contains a differential amplifier, a voltage amplifier, and an output amplifier.

  • True
  • False
Q.22

The open-loop voltage gain (Aol) of an op-amp is the

  • external voltage gain the device is capable of
  • internal voltage gain the device is capable of
  • most controlled parameter
  • same as Acl
Q.23

A virtual ground is a ground for current, but not for voltage.

  • True
  • False
Q.24

The input offset current equals the

  • average of two base currents
  • collector current divided by the current gain
  • difference between two base-emitter voltages
  • difference between two base currents
Q.25

If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by 2.

  • True
  • False
Q.26

A monostable multivibrator must be triggered.

  • True
  • False
Q.27

The voltage-follower amplifier circuit has a fixed voltage gain of approximately 10.

  • True
  • False
Q.28

Crystal oscillator circuits have a very low Q.

  • True
  • False
Q.29

Op-amps used as high- and low-pass filter circuits employ which configuration?

  • noninverting
  • comparator
  • open-loop
  • inverting
Q.30

An ideal amplifier should have:

  • high input current
  • zero offset
  • high output impedance
  • moderate gain
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