Electronics Ch. 4

Questão	Responda
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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