Flashcards
Electronics Ch. 4
Cards in this deck (25)
- 1If N1/N2=4 and the primary voltage is 120 V, what is the secondary voltage?B. 30 V
- 2In a step down transformer, which is larger?A. Primary Voltage
- 3A 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
- 4With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?C. 180 Degrees
- 5Suppose 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 toC. 29.7 V
- 6The voltage out of a bridge rectifier is a:D. Sine wave
- 7If the line voltage is 115 Vrms, a turns ratio of 5:1 means the rms secondary voltage is closest to:D. 35 V
- 8What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 Vrms?C. 14.1 V
- 9We 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
- 10With a full-wave rectified voltage across the load resistor, load current flows for what part of a cycle?D. 360 degrees
- 11What 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
- 12If line frequency is 60 Hz, the output frequency of a half-wave rectifier isB. 60 Hz
- 13If line frequency is 60 Hz, the output frequency of a bridge rectifier isC. 120 Hz
- 14With the same secondary voltage and filter, which has the most ripple?A. Half-wave rectifier
- 15With the same secondary voltage and filter, which produces the least load voltage?B. Full-wave rectifier
- 16If the filtered load current is 10 mA, which of the following has a diode current of 10 mA?A. Half-wave rectifier
- 17If 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
- 18The 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 ofC. 4 A
- 19What is the PIV across each diode of a bridge rectifier with a secondary voltage of 20 Vrms?C. 28.3 V
- 20If the secondary voltage increases in a bridge rectifier with a capacitor-input filter, the load voltage willC. Increase
- 21If the filter capacitance is increased, the ripple willA. Decrease
- 22A circuit that removes positive or negative parts of a waveform is called aB. Clipper
- 23A circuit that adds a positive or negative dc voltage to an input sine wave is called aA. Clamper
- 24For a clamper circuit to operate properly, its RLC time constant should beC. >100 times the period T of the signal
- 25Voltage multipliers are circuits best used to produceC. High Voltage and low Current