Floyd Self-test in Oscillators

This is the Self-test in Chapter 16: Oscillators from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Floyd Self-test Chapter 16 Topic Outline

• Floyd Self-test in The Oscillator
• Floyd Self-test in Feedback Oscillators
• Floyd Self-test in Oscillators with RC Feedback Circuits
• Floyd Self-test in Oscillators with LC Feedback Circuits
• Floyd Self-test in Relaxation Oscillators
• Floyd Self-test in The 555 Timer as an Oscillator

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. An oscillator differs from an amplifier because the oscillator

• (a) has more gain
• (b) requires no input signal
• (c) requires no dc supply
• (d) always has the same output

2. One condition for oscillation is

• (a) a phase shift around the feedback loop of 180°
• (b) a gain around the feedback loop of one-third
• (c) a phase shift around the feedback loop of 0°
• (d) a gain around the feedback loop of less than 1

3. A second condition for oscillation is

• (a) no gain around the feedback loop
• (b) a gain of 1 around the feedback loop
• (c) the attenuation of the feedback circuit must be one-third
• (d) the feedback circuit must be capacitive

4. In a certain oscillator, The attenuation of the feedback circuit must be

• (a) 1
• (b) 0.01
• (c) 10
• (d) 0.02

5. For an oscillator to properly start, the gain around the feedback loop must initially be

• (a) 1
• (b) less than 1
• (c) greater than 1
• (d) equal to B

6. Wien-bridge oscillators are based on

• (a) positive feedback
• (b) negative feedback
• (c) the piezoelectric effect
• (d) high gain

7. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency

• (a) decreases
• (b) increases
• (c) remains the same

8. The Wien-bridge oscillator’s positive feedback circuit is

• (a) an RL circuit
• (b) an LC circuit
• (c) a voltage divider
• (d) a lead-lag circuit

9. A phase-shift oscillator has

• (a) three RC circuits
• (b) three LC circuits
• (c) a T-type circuit
• (d) a -type circuit

10. Colpitts, Clapp, and Hartley are names that refer to

• (a) types of RC oscillators
• (b) inventors of the transistor
• (c) types of LC oscillators
• (d) types of filters

11. The main feature of a crystal oscillator is

• (a) economy
• (b) reliability
• (c) stability
• (d) high frequency

12. An oscillator whose frequency is changed by a variable dc voltage is known as

• (a) a crystal oscillator
• (b) a VCO
• (c) an Armstrong oscillator
• (d) a piezoelectric device

13. The operation of a relaxation oscillator is based on

• (a) the charging and discharging of a capacitor
• (b) a highly selective resonant circuit
• (c) a very stable supply voltage
• (d) low power consumption

14. Which one of the following is not an input or output of the 555 timer?

• (a) Threshold
• (b) Control voltage
• (c) Clock
• (d) Trigger
• (e) Discharge
• (f ) Reset

Complete List of Floyd Self-test in Electronic Devices per topic

Floyd Self-test in Electronic Devices

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