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Semiconductors 2
Quiz for Lesson 6 Chapter 10
| Question | Answer |
|---|---|
| 1. An oscillator is a circuit that converts DC to AC T F | True |
| 2. Most oscillators are ? with feedback. If the feedback is positive, the amplifier will provide an output waveform. | Amplifiers |
| 3. Another name for positive feedback is ? feedback. | regenerative |
| 4.What basic criteria must be present for an amplifier to oscillate? | 1.The amplifier gain must be greater than the loss in the feedback path 2. The signal feedback to the amplifier input must be in-phase. |
| 5.In-phase feedback is also called positive feedback or regenerative feedback. t f | true |
| 6.Which of the following formulas expresses Barkhausen criterion? | aV x AV = 1 |
| 7.Variable-frequency oscillators (VFOs) have the capability to produce a range of frequencies. t f | True |
| 8.It is possible to control the frequency of an oscillator by using ? components; this circuit is called a lead-lag network. | resistive-capacitive |
| 9.A change in ? will most likely cause the biasing of an oscillator circuit to become imbalanced. | power supply voltage |
| 11.RC oscillators are limited to frequencies below ? . | 1 mHz |
| 12.Inductive-capacitive LC circuits can be designed to operate in high megahertz ranges and, are often called ? . | tank circuits |
| 15. ? are highly stable, but the range of frequencies is sacrificed. | Phase shift bridged-T oscillators |
| 16.Negative feedback decreases the gain of the op amp. Select one: True False | True |
| 17.What type of oscillator has two feedback circuits? | Wien-Bridge oscillator ote: 1. Positive feedback controls the frequency of the oscillator. 2. Negative feedback controls the gain of the oscillator. |
| 18.A phase shift oscillator has the signal at the collector ? out-of-phase with the signal at the base. | 180° |
| 19. The phase shift network is designed to produce a(n) ? phase shift at the output of each section. | 60 degrees |
| 20. The total phase shift of the phase shift network will be ? . | 180° |
| 21.With a ? oscillator, the inductor is tapped; the tap position is important for the ratio of L1 to L2 to determine the gain. | Hartley |
| 23.The most stable oscillator is the ? oscillator. | crystal-controlled |
| 24. Crystals operate on the piezoelectric effect; therefore, when an electric charge is applied to a crystal, it expands and contracts. T/F | True |
| 25.Quartz crystals are made of silicon dioxide, the same material used in ? . | MOSFETS |
| 26.Different physical dimensions of crystal produce different frequencies. Select one: True False | True |
| 27. ? oscillators do not produce sine waves; the outputs for these circuits are sawtooth or rectangular waveforms. | Relaxation |
| 29.he capacitor in the circuit will charge to ? of the supply voltage in the first time constant | 63% |
| 30. Assume that R1 = 10,000 ohms and C = 10 microfarads. Calculate the frequency of oscillation. | formula: fr=1/RC answer: |
| 31. Suppose someone wants to create an oscillation in the circuit that would oscillate at 100 hertz. The value of R1 = 10 kilohms determines a value for the capacitor so that the circuit will oscillate at 100 hertz. What is the value of the capacitor (in µF)? | C=1/Rf |
Created by:
Shawnt321