16 Questions
What is the purpose of the step-down transformer in a d.c. power supply?
To convert high voltage mains input to low voltage
What is the function of the reservoir capacitor in a d.c. power supply?
To store a considerable amount of charge and smooth out voltage pulses
What role does the stabilizing circuit play in a d.c. power supply?
To regulate the output voltage
Which electronic component is often used as a reference in the stabilizing circuit of a d.c. power supply?
Zener diode
What does the rectifier arrangement in a d.c. power supply do to the a.c. output from the transformer secondary?
Converts it to unsmoothed pulsating d.c.
What is the primary function of conventional silicon rectifier diodes in a d.c. power supply?
Rectify the a.c. output from the transformer secondary
What is the function of a half-wave rectifier circuit?
To convert AC to DC
What happens during the negative half-cycle in a half-wave rectifier circuit?
The diode becomes open and blocks the current flow
What is the peak voltage applied to diode D1 in the half-wave rectifier circuit?
17 V
What is the function of the step-down transformer (T1) in the half-wave rectifier circuit?
To decrease the voltage
Why are semiconductor diodes commonly used in rectifier circuits?
To ensure that current flows only in one direction
What is the frequency of the pulses of voltage developed across RL in the half-wave rectifier circuit?
50 Hz
What happens to the negative half-cycles in a half-wave rectifier circuit?
They are blocked by the diode
What is the role of diode D1 during each positive half-cycle in a half-wave rectifier circuit?
It allows current flow in both directions
What does the peak voltage across RL represent in a half-wave rectifier circuit?
The actual peak amplitude of the positive half-cycle pulses
Why is it important to select a diode with consideration to its reverse bias in a rectifier application?
To prevent damage to the load resistor
This quiz covers the block diagram of a d.c. power supply, including the step-down transformer, rectification using silicon rectifier diodes, and the smoothing and filtering process. It also involves the understanding of the output produced by these components.
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