Defenitions

Question 1

Rectification is the process of converting DC voltage into AC voltage

True or false

Answer 1

False

Rectification is the process of converting AC voltage to DC voltage

Question 2

The voltage drop of a centre tap full wave rectifier is

.7
1.4
2
1.5

Answer 2

.7

Question 3

The voltage drop of a bridge rectifier is
.7
1.4
1.5
2

Answer 3

1.4

Question 4

When a semiconductor made from silicone is heated, it’s resistance

Answer 4

Decreases

Question 5

P type semiconductors are doped with elements that have

Answer 5

Two valence electrons

Question 6

N type semiconductors are doped with elements that have

Answer 6

Five valence electrons

Question 7

In N type semiconductor, the majority of current is conducted by

Answer 7

Electrons

Question 8

In P type semiconductor, the majority of current is conducted by?

Answer 8

Holes

Question 9

The outermost orbit of electrons is called the?

Answer 9

Valance shell

Question 10

Atoms with nearly empty valence shells make good?

Answer 10

Conductors

Question 11

Atoms with half full valance shells make good?

Answer 11

Semiconductors

Question 12

Atoms with full valance shells are good?

Answer 12

Insulator

Question 13

The atoms of a material used as a conductor generally contain how many valence electrons

Answer 13

1 or 2

Question 14

The atoms of a material used as an insulator generally contain how many valence electrons?

Answer 14

7-8

Question 15

The two most common materials used to produce semiconductor devices are what?

Answer 15

Silicone and germanium

Question 16

What is a lattice structure?

Answer 16

A lot of structure is an ordered arrangement of atoms in the atomic structure of a material

Question 17

How is a P type material made?

Answer 17

Add a material which has only three valence electrons to appear semiconductor material

Question 18

How is an N type material made?

Answer 18

Add a material which has five valence electrons to a pure semiconductor material

Question 19

Which type of semiconductor material can withstand the greatest amount of heat?

Answer 19

Silicone

Question 20

All electronic components are formed from P & N type materials. What factors determine what kind of components will be formed.

Answer 20

The thickness and manner in which the P and N type materials are joined together, determine the components

Question 21

Name 4 types of fixed resistors

Answer 21

Composition carbon
Metal film
Carbon film
Wirewound

Question 22

What is the advantage of a metal film resistor over a carbon resistor?

Answer 22

Metal film resistors do not change their ohmic value with age

Question 23

What is the advantage of a wire wound resistor?

Answer 23

Wire wound resistors have a higher power rating

Question 24

Is 51,000 ohms a standard value for a 5% resistor?

Answer 24

Yes

Question 25

What is a potentiometer?

Answer 25

A variable resistor used to control voltage

Question 26

What electrical quantity such as voltage, current, resistance, or watt is the oscilloscope used to measure?

Answer 26

Voltage

Question 27

What quantity is measured on the X axis of an oscilloscope?

Answer 27

Time

Question 28

What quantity is measured on the Y axis of an an oscilloscope?

Answer 28

Amplitude of voltage

Question 29

What is the beam Finder used for?

Answer 29

To show the position of the trace, if it’s off the display

Question 30

Why should a bright spot not be left on display of an oscilloscope?

Answer 30

It will burn a spot on the face of the CRT

Question 31

What is the function of the slope control?

Answer 31

It permits the oscilloscope to trigger on the positive or negative half of the wave form

Question 32

What type of metre measures the voltage drop across a resistor to determine its resistance value

Answer 32

Digital ohmmeter

Question 33

What function does a heat sink serve when it is attached to a component?

Answer 33

The heat sink increases the surface area of the component, which permits air to remove heat at a faster rate

Question 34

Why should thermal compound be used when attaching a component to a heat sink?

Answer 34

It produces a good thermal bond between two components

Question 35

How many elements of a semiconductor material are contained in a diode?

Answer 35

Two

Question 36

If a dial is made of silicone, how many volts does it take to turn it on so that it will conduct current in forward direction?

Answer 36

.6 to .7

Question 37

Must the voltage connected to an anode of a diode be positive or negative to make it forward biased?

Answer 37

Positive

Question 38

What does the PIV rating on diode mean?

Answer 38

The amount of voltage it can hold off in reverse direction

Question 39

How many layers of semiconductor material are diodes constructed with?

Answer 39

2

Question 40

True or false A junction dialled is designed to conduct current from the cathode terminal to the anode terminal ?

Answer 40

False A Junction diet is designed to conduct current from the anode terminal to the cathode terminal

Question 41

Forward voltage drop of silicon diode at room temperature is approximately what voltage?

Answer 41

.7

Question 42

When the anode is positive with respect to the cathode, a diode is what biased?

Answer 42

Forward

Question 43

When the cathode is positive with respect to the anode, a diode is what biased

Answer 43

Reverse

Question 44

The maximum voltage a diode can block in the reverse direction is known as what

Answer 44

Peak inverse voltage (PIV)

Question 45

The small amount of current flow through a diode in reverse buys is called?

Answer 45

Leakage current

Question 46

The forward voltage drop of a single LED is in the range of 1.6 V to 4.2 V True or false

Answer 46

True

Question 47

When powered from a fixed voltage source, an LED requires a resistor in series true or false

Answer 47

True

Question 48

What do the letters LED stand for?

Answer 48

Light emitting diode

Question 49

If an LED is connected to an AC circuit, will the output voltage be AC or DC

Answer 49

DC

Question 50

What is the average Ford voltage drop of an LED?

Answer 50

1.7 V

Question 51

Is the resistance of a CAD cell greater in darkness or in light?

Answer 51

In darkness

Question 52

What is a rectifier?

Answer 52

Device that changes AC voltage into DC voltage

Question 53

What is the simplest type of rectifier?

Answer 53

Halfway rectifier

Question 54

What type of single phase rectifier requires the use of a centre tapped transformer?

Answer 54

Full wave rectifier with two diodes

Question 55

What type of single phase rectifier requires the use of four diodes?

Answer 55

A bridge rectifier

Question 56

What is the most efficient type of single phase rectifier?

Answer 56

Full wave rectifier, 2 diodes

Question 57

What type of three phase rectifier requires the use of a WYE-connected transformer with a centre tap?

Answer 57

Half wave

Question 58

How many diets are required to construct a three phase, full wave rectifier?

Answer 58

6

Question 59

Which type of rectifier has less ripple? A full wave, single phase rectifier or a half wave three phase rectifier?

Answer 59

Half wave three phase rectifier