Which of the following statements is correct regarding the ripple factor of different rectifiers?
1
A bridge rectifier has a better ripple factor than a centre-tapped rectifier.
2
A full-wave rectifier has a higher ripple factor than a half-wave rectifier.
3
A half-wave rectifier has more than twice the ripple factor of a full-wave rectifier.
4
A rectifier with a higher ripple factor is more preferable for DC power supply than one with a lower ripple factor.