Advanced Qualification · A-004 Power supplies · A-004-002-009
In the design of a power supply, the designer must be careful of resonance effects because the ripple voltage could build up to a high value. The components that must be carefully selected are:
- A the bleeder resistor and the first choke
- B first capacitor and second capacitor
- C first choke and second capacitor
- D first choke and first capacitor
Correct answer: D — first choke and first capacitor. From the official ISED question bank, verified word for word.
Why
The first choke and first capacitor form the initial filter stage where unwanted ripple voltage can resonate if their values are not matched correctly, causing the ripple to build up to dangerous levels. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.