Power Supplies
The block marked 'Filter' in the diagram is to
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filter RF radiation from the output of the power supply
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Correct Answersmooth the rectified waveform from the rectifier
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act as a 50 Hz tuned circuit
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restore voltage variations
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The block marked 'Regulator' in the diagram is to
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regulate the incoming mains voltage to a constant value
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ensure that the output voltage never exceeds a dangerous value
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keep the incoming frequency constant at 50 Hz
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Correct Answerkeep the output voltage at a constant value
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The block marked 'Transformer' in the diagram is to
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transform the incoming mains AC voltage to a DC voltage
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ensure that any RF radiation cannot get into the power supply
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Correct Answertransform the mains AC voltage to a more convenient AC voltage
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transform the mains AC waveform into a higher frequency waveform
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The block marked 'Rectifier' in the diagram is to
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Correct Answerturn the AC voltage from the transformer into a fluctuating DC voltage
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rectify any waveform errors introduced by the transformer
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turn the sinewave output of the rectifier into a square wave
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smooth the DC waveform
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The block marked 'Regulator' in the diagram could consist of
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four silicon power diodes in a regulator configuration
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two silicon power diodes and a centre-tapped transformer
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Correct Answera three-terminal regulator chip
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a single silicon power diode connected as a half-wave rectifier
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In the block marked regulator in the diagram below, a reversed diode may be present across the regulator. Its job is to
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Block negative voltages from appearing at the output
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Blow a fuse if high voltages occur at the output
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Blow a fuse if negative currents occur at the output
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Correct AnswerBypass the regulator for higher voltage at its output compared to its input
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