If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?

A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?

A. 8 V

B. 7 V

C. 6 V

D. 2 V

In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?

A. 10 O

B. 50 O

C. 25 O

D. 40 O

When load current is zero, the Zener current will be_____________?

A. Zero

B. Minimum

C. Maximum

D. None of the above

A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?

A. 10 O

B. 20 O

C. 15 O

D. 40 O

A Zener regulator _____________ in the power supply?

A. Increases the ripple

B. Decreases the ripple

C. Neither increases nor decreases the ripple

D. Data insufficient