Floyd Self-test Chapter 13 Topic Outline
- Floyd Self-test in Comparators
- Floyd Self-test in Summing Amplifiers
- Floyd Self-test in Integrators and Differentiators
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. In a zero-level detector, the output changes state when the input
- (a) is positive
- (b) is negative
- (c) crosses zero
- (d) has a zero rate of change
2. The zero-level detector is one application of a
- (a) comparator
- (b) differentiator
- (c) summing amplifier
- (d) diode
3. Noise on the input of a comparator can cause the output to
- (a) hang up in one state
- (b) go to zero
- (c) change back and forth erratically between two states
- (d) produce the amplified noise signal
4. The effects of noise can be reduced by
- (a) lowering the supply voltage
- (b) using positive feedback
- (c) using negative feedback
- (d) using hysteresis
- (e) answers (b) and (d)
5. A comparator with hysteresis
- (a) has one trigger point
- (b) has two trigger points
- (c) has a variable trigger point
- (d) is like a magnetic circuit
6. In a comparator with hysteresis,
- (a) a bias voltage is applied between the two inputs
- (b) only one supply voltage is used
- (c) a portion of the output is fed back to the inverting input
- (d) a portion of the output is fed back to the noninverting input
7. Using output bounding in a comparator
- (a) makes it faster
- (b) keeps the output positive
- (c) limits the output levels
- (d) stabilizes the output
8. A summing amplifier can have
- (a) only one input
- (b) only two inputs
- (c) any number of inputs
9. If the voltage gain for each input of a summing amplifier with a feedback resistor is unity, the input resistors must have a value of
- (a) 4.7kΩ
- (b) 4.7kΩ divided by the number of inputs
- (c) 4.7kΩ times the number of inputs
10. An averaging amplifier has five inputs. The ratio Rf /R must be
- (a) 5
- (b) 0.2
- (c) 1
11. In a scaling adder, the input resistors are
- (a) all the same value
- (b) all of different values
- (c) each proportional to the weight of its input
- (d) related by a factor of two
12. In an ideal integrator, the feedback element is a
- (a) resistor
- (b) capacitor
- (c) zener diode
- (d) voltage divider
13. For a step input, the output of an integrator is
- (a) a pulse
- (b) a triangular waveform
- (c) a spike
- (d) a ramp
14. The rate of change of an integrator’s output voltage in response to a step input is set by
- (a) the RC time constant
- (b) the amplitude of the step input
- (c) the current through the capacitor
- (d) all of these
15. In a differentiator, the feedback element is a
- (a) resistor
- (b) capacitor
- (c) zener diode
- (d) voltage divider
16. The output of a differentiator is proportional to
- (a) the RC time constant
- (b) the rate at which the input is changing
- (c) the amplitude of the input
- (d) answers (a) and (b)
17. When you apply a triangular waveform to the input of a differentiator, the output is
- (a) a dc level
- (b) an inverted triangular waveform
- (c) a square waveform
- (d) the first harmonic of the triangular waveform
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