Physics

Question 1

1A half-wave rectifier uses

Easy

A. a transformer only B. four diodes C. a transistor only D. one diode

Question 2

2A Zener diode in a power supply is used for

Easy

A. rectification only B. oscillation C. amplification D. voltage regulation

Question 3

3Half-wave rectification uses

Easy

A. four diodes B. no diodes C. two capacitors only D. one diode

Question 4

4A capacitor connected across a rectifier output is used to

Easy

A. step up voltage B. reverse current C. smooth the d.c. output D. increase ripple

Question 5

5A bridge rectifier uses

Easy

A. one diode B. four diodes C. two diodes D. six capacitors

Question 6

6Full-wave rectification makes use of

Easy

A. no part B. only the positive half C. only the negative half D. both halves of the a.c. cycle

Question 7

7Converting a.c. to d.c. is called

Easy

A. induction B. amplification C. rectification D. modulation

Question 8

8In a power supply, a capacitor placed across the output of a rectifier

Easy

A. smooths the output voltage B. increases the ripple C. blocks all current D. changes DC to AC

Question 9

9The ripple in a rectified output is reduced by

Hard

A. removing diodes B. a smaller capacitor C. a larger smoothing capacitor D. higher frequency transformer only