Diodes and rectification

Question 1

What does power conversion involve

Answer 1

Voltage, frequency, waveshape and polyphase conversion

Question 2

What is AC-DC conversion called

Answer 2

Rectification

Question 3

What is DC-DC conversion

Answer 3

Chopping

Question 4

What is DC-AC conversion called

Answer 4

Inversion

Question 5

What is AC-AC

Answer 5

Cyclocoversion

Question 6

What are some of the characteristics of DC voltage- step down (voltage divider circuit

Answer 6

High Power dissipation, Low efficiency, output voltage depends on load and only step down

Question 7

What are some of the disadvantages of DC step up/ down converters

Answer 7

Bulky, Heavy, Noisy, Slow Response, not very efficient or reliable

Question 8

What are the advantages of using power electronics for conversion

Answer 8

High efficiency, High Relability, High Flexibility, High power density- cost effective, High performance, static and quiet

Question 9

What is the simplest form of power switch

Answer 9

A diode

Question 10

What is true of ideal switches

Answer 10

Unidirectional current flow
0-on state voltage drop
infinite voltage and current rating
Instantaneous on/off switching

Question 11

Is a diode a linear or non- linear semi conductor device

Answer 11

Non linear

Question 12

What is rectification

Answer 12

The process in which AC is converted to DC

Question 13

For half wave rectification what is the value of DC voltage produced

Answer 13

0.45*Vac rms

Question 14

For full wave centre tap what is the value of the DC voltage produced

Answer 14

0.9Vac rms