D-6 Industrial Power Electronics

Question 1

What is a Rectifier (converter)

Answer 1

Device that changes A.C. to Pulsing DC.

Question 2

Forward Bias

Answer 2

Speaker allows current thru

Question 3

Reverse Bias

Answer 3

Speaker doesnt allow , polaritys wrong

Question 4

What does the diode do ?

Answer 4

Blocks the second phase of AC

Question 5

Why are electrolytic capacitors used as filters?

Answer 5

High Capacitance Rating (microfarads)

Question 6

What is the main dis advantage of using only a capacitor for filtering?

Answer 6

Poor Voltage Regulation

Question 7

What is a pi filter?

Answer 7

A Filter that contains 2 capacitors and 1 inductor to remove the ripple effect to a higher degree

Question 8

Red terminal is ?

Answer 8

Positive

Question 9

Black terminal is?

Answer 9

Negative

Question 10

The Bended part of the capacitor has a ______ polarity

Answer 10

Negative

Question 11

Minimum DC working voltage must be greater then …

Answer 11

The AC peak input

Question 12

minimum PIV rating for the diode ?

Answer 12

2 x Emax voltage =340 v dc

Question 13

Inductance Filters are also called?

Answer 13

Choke Filters, L Filter

Question 14

DC working voltage =

Answer 14

AC 12OV / .707 = 170v DC

Question 15

E rms =

Answer 15

E max x .707

Question 16

Full wave rectifier has a value of :

Answer 16

.637

Question 17

Half wave rectifier has a value of :

Answer 17

.318

Question 18

Power of a half wave rectifier :

Answer 18

P = Emax x Imax / 4

Question 19

The yellow terminal on a bridge rectifier is the

Answer 19

AC input terminal and there should be two.

Question 20

The three leads of a transistor are

Answer 20

Base
Collector
Emitter

Question 21

An ohmmeter testing between the Base and Emitter would find a ____ value of resistance

Answer 21

Low resistance

Question 22

An ohmmeter testing between the Collector and Emitter would find a ____ value of resistance

Answer 22

High resistance

Question 23

To find the voltage and current ratings of a transistor where would you look?

Answer 23

Spec manual or data book

Question 24

Two types of transistors are available: ____ is used in low power applications and _____ for higher current rated transistors

Answer 24

Signal for low power

Power for higher current ratings

Question 25

The ratio of Ic to Ib is called the ___ of a transistor

Answer 25

Beta

Question 26

If Vce=Vcc then the transistor is

Answer 26

Cut off

Question 27

For all transistor circuits, ____ is the sum of Ib plus____.

Answer 27

Ie = Ib+ Ic

Question 28

If Vrc is very nearly equal to Vcc, then the transistor is said to be _____

Answer 28

Saturated

Question 29

If Vrc is zero, then ____ is equal to Vcc.

Answer 29

Vce

Question 30

Design considerations when building a Pi filter

Answer 30

``` Ripple frequency Load voltage Load current Peak current limits Allowable voltage regulation ```

Question 31

T or F Form factors are used to determine the average voltage when the rms voltage is known in a full wave or half wave rectifier.

Answer 31

True

Question 32

Important junction diode ratings are?

Answer 32

PIV -the amount of voltage it can take with out damage. Forward dropping voltage- Power rating- how much wattage can be taken before damage occurs

Question 33

Undoped semi conductors have__ electrons in their valence orbit

Answer 33

4