13400540
Description
Flashcards by Matthew Kendall, updated more than 1 year ago
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Created by Matthew Kendall
about 6 years ago
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| Question | Answer |
| If N1/N2=4 and the primary voltage is 120 V, what is the secondary voltage? | B. 30 V |
| In a step down transformer, which is larger? | A. Primary Voltage |
| A transformer has a turns ratio of 2:1. What is the peak secondary voltage if 115 Vrms is applied to the primary winding? | B. 81.3 V |
| With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle? | C. 180 Degrees |
| Suppose line voltage may be as low as 105 Vrms or as high as 125 Vrms in a half-wave rectifier. With a 5:1 step-down transformer, the minimum peak load voltage is closest to | C. 29.7 V |
| The voltage out of a bridge rectifier is a: | D. Sine wave |
| If the line voltage is 115 Vrms, a turns ratio of 5:1 means the rms secondary voltage is closest to: | D. 35 V |
| What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 Vrms? | C. 14.1 V |
| We want a peak load voltage of 40 V out of a bridge rectifier. What is the approximate rms value of the secondary voltage? | C. 28.3 V |
| With a full-wave rectified voltage across the load resistor, load current flows for what part of a cycle? | D. 360 degrees |
| What is the peak load voltage out of a bridge rectifier for a secondary voltage of 12.6 Vrms? (Use second approximation) | B. 16.4 V |
| If line frequency is 60 Hz, the output frequency of a half-wave rectifier is | B. 60 Hz |
| If line frequency is 60 Hz, the output frequency of a bridge rectifier is | C. 120 Hz |
| With the same secondary voltage and filter, which has the most ripple? | A. Half-wave rectifier |
| With the same secondary voltage and filter, which produces the least load voltage? | B. Full-wave rectifier |
| If the filtered load current is 10 mA, which of the following has a diode current of 10 mA? | A. Half-wave rectifier |
| If the load current is 5 mA and the filter capacitance is 1000 uF, what is the peak to pear ripple out of a bridge rectifier? | D. 41.7 mV |
| The diodes in a bridge rectifier each have a maximum dc current rating of 2 A. This means the dc load current can have a maximum value of | C. 4 A |
| What is the PIV across each diode of a bridge rectifier with a secondary voltage of 20 Vrms? | C. 28.3 V |
| If the secondary voltage increases in a bridge rectifier with a capacitor-input filter, the load voltage will | C. Increase |
| If the filter capacitance is increased, the ripple will | A. Decrease |
| A circuit that removes positive or negative parts of a waveform is called a | B. Clipper |
| A circuit that adds a positive or negative dc voltage to an input sine wave is called a | A. Clamper |
| For a clamper circuit to operate properly, its RLC time constant should be | C. >100 times the period T of the signal |
| Voltage multipliers are circuits best used to produce | C. High Voltage and low Current |
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