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Circuits - grol
topic 3 - D 24questions
| Question | Answer |
|---|---|
| What is the approximate magnitude of the impedance of a parallel R-L-C circuit at the resonance? | Approximately equal to the circuit resistance |
| What is the approximate magnitude of the impedance of a series R-L-C circuit at resonance? | approximately equal to the circuit resistance |
| how could voltage be greater across resistances in series that applied voltage? | Resonance |
| what is the characteristic of the current flow in series R-L-C circuit at resonance? | maximum |
| what is the characteristic of the flow within the parallel elements in a parallel R-L-C circuit at resonance? | Maximum |
| what is the relationship between current through a resonant circuit and the voltage across the circuit? | the voltage and current are in phase |
| what is the main advantage of using an op-amp audio filter over a passive LC audio filter? | Op-amps exhibit gain rather that insertion loss |
| what are the characteristics of an inverting operational amplifier (op-amp) circuit? | It has input and output signals 180 degrees out of phase |
| Gain of a closed-loop op-amp circuit is determined by ? | The op-amp's external feedback network |
| which of the following op-amp circuits is operated open - loop? | comparator |
| In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled? | Frequency would be lower. |
| What frequency synthesizer circuit uses a phase comparator, look-up table, digital-to-analog converter, and a low-pass antialias filter? | A direct digital synthesizer |
| A circuit that compares the output of a voltage-controlled oscillator (VCO) to a frequency standard and produces an error voltage that is then used to adjust the capacitance of a varactor diode used to control frequency in that same VCO is called what? | Phase-locked loop. |
| RF input to a mixer is 200 MHz and the local oscillator frequency is 150 MHz. What output would you expect to see at the IF output prior to any filtering? | 50, 150, 200 and 350 MHz. |
| What spectral impurity components might be generated by a phase-locked-loop synthesizer? | Broadband noise. |
| In a direct digital synthesizer, what are the unwanted components on its output? | Spurs at discrete frequencies. |
| What is the definition of a phase-locked loop (PLL) circuit? | A servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator. |
| Given the combined DC input voltages, what would the output voltage be in the circuit shown in Figure 3D7? | -5.5 V |
| Which lamps would be lit in the circuit shown in Figure 3D8? | 2, 3, 4, 7 and 8. |
| What will occur if an amplifier input signal coupling capacitor fails open? | No amplification will occur, with DC within the circuit measuring normal. |
| In Figure 3D9, determine if there is a problem with this regulated power supply and identify the problem. | There is no problem with the circuit. |
| In Figure 3D10 with a square wave input what would be the output? | 3 |
| With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would you expect to see on an oscilloscope display? | 2 |
Created by:
pookee888
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