Which of the following are TRUE? Select all that apply. If the input is a sinuso
ID: 2085104 • Letter: W
Question
Which of the following are TRUE? Select all that apply. If the input is a sinusoidal signal, the output of a half-wave rectifier will have the same frequency as the input. The order of stages in a DC power supply from input to output is a transformer, rectifier, then lastly a filter. If the input is a sinusoidal signal, the output of a full-wave rectifier will have the same frequency as the input. To have a smoother output voltage from an ac to dc converter, one must use a smaller filter capacitor. If the diodes in the rectifiers are non-ideal, the output voltage of a full-wave rectifier is smaller than that of a half-wave rectifier.Explanation / Answer
Answer for question 1. This statement is true, If the input to a halfwave rectifier is sinusoidal then the frequency of output and input signal will be same. The reason is the same time period of input and output signal. Time periiod is the time interval after which a signal repeats itself. Please refer to waveform of input and output signal of halfwave rectifier in the answer you provided and notice the same time period. If their time period is same then their frequency will also be same because
Time period =1/frequency
Answer for question 2. This statement is also true because to get a DC from a 220V AC, The high voltage AC signal should be first step down to a 12 or 15 V AC using a transformer and then a rectifier is needed to convert this small AC voltage into DC
Answer for question 3. This statement is false ,If the input to a full wave rectifier is sinusoidal then the frequency of output signal is double of input signal frequency. The reason is the different time period of input and output signal. Time periiod is the time interval after which a signal repeats itself. Please refer to waveform of input and output signal of full wave rectifier in the answer you provided and notice the different time period, Time period of output is half of the timeperiod of input therfore the frequency of output is double of input frequency
Answer for question 4. This statement is true. The output of rectifier is not a pure DC, its a pulsating DC. To smooth the pulsating signal a filter capacitor is generally used
Answer for questiom 5. This statement is true. If a non-ideal dioed is used in a rectifier there will be a potential drop across these diode and hence the output signal voltage will be less than the input signal voltage
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