QT in TLE

Question 1

He invented the first practical electron tube called “Fleming Valve”.

Answer 1

John Ambrose Fleming

Question 2

It is also called the electron tube.

Answer 2

Vacuum Tubes

Question 3

A sealed-glass or metal-ceramic enclosure used in electronic circuitry to control the flow of electrons between metal electrodes sealed inside the tubes.

Answer 3

Vacuum Tubes

Question 4

Within a vacuum bulb, a ? is heated (directly or indirectly).

Answer 4

Cathode

Question 5

What do you call the metal cylinder surrounding the cathode?

Answer 5

Plate

Question 6

Came on its own with the invention of the transistor in 1947.

Answer 6

Solid state device

Question 7

The opposite of vacuum technology. It also used in contrast to any device with a moving part, such as hard disk drive.

Answer 7

Solid state

Question 8

Name the solid state materials.

Answer 8

Conductors, insulators and semi-conductors.

Question 9

Materials that permit electrons to flow freely from particle to particle.

Answer 9

Conductors

Question 10

Materials that impede the free flow of electrons from atom to atom and molecule to molecule.

Answer 10

Insulators

Question 11

Neither a good conductor nor a good insulator.

Answer 11

Semiconductors

Question 12

During the early 1950s, what was the major semiconductor material?

Answer 12

Germanium

Question 13

During the early 1960s, what has become the practical substitute for semiconductor material?

Answer 13

Silicon

Question 14

At high temperature its conductivity approaches that of a what?

Answer 14

Metal

Question 15

Same question from before but at low temperature?

Answer 15

Insulator

Question 16

Examples of modern-day semiconductor materials.

Answer 16

Transistors, resistors, ICs, operational amplifiers, diodes.

Question 17

The 2 types of semiconductor:

Answer 17

N-type and P-type

Question 18

Carries negative electrons.

Answer 18

N-type

Question 19

Positive charged holes move and carry the current.

Answer 19

P-type

Question 20

They come in variety of shapes, sizes and forms. They have value of resistance printed on them or as a color code.

Answer 20

Resistors

Question 21

What the does the 1st band indicates in a resistor?

Answer 21

First digit of the code

Question 22

The 2nd?

Answer 22

Second digit of the code

Question 23

The 3rd?

Answer 23

Multiplier

Question 24

The 4th??

Answer 24

Tolerance Value

Question 25

Arrange the color of the bands.

Answer 25

Black, brown, red, orange, green, blue, violet, gray, white, gold, silver.

Question 26

What is the function of a capacitor?

Answer 26

It stores electrical charge between two plates.

Question 27

Unit of capacitance.

Answer 27

Farads

Question 28

What is the material between the plates of a capacitor?

Answer 28

Dielectric material

Question 29

A device that passes current in only one direction.

Answer 29

Diodes

Question 30

The 2 leads of a diode, indicate their sign.

Answer 30

Anode (+) and Cathode (-)

Question 31

What do you call the interface between p-type and n-type material?

Answer 31

PN-Junction

Question 32

The intersection between p and n side.

Answer 32

Junction

Question 33

A barrier between the n-type and p-type silicon that contains no free electrons or holes.

Answer 33

Depletion zone

Question 34

DC Voltage positive terminal connected to the p region and negative to the n region. It is the condition that permits current through the pn-junction of a diode.

Answer 34

Forward bias

Question 35

Negative terminal connected to the p-region and positive to the n-region.

Answer 35

Reverse bias

Question 36

Fundamentally three-terminal devices.

Answer 36

Transistors

Question 37

Arrange in order of the pins in NPN transistor:

Answer 37

C-B-E

Question 38

In PNP transistor:

Answer 38

E-B-C

Question 39

When layers have extra electrons added to them, the process is called?

Answer 39

Doping

Question 40

True or false? Electrons can easily flow from the p-type to n-type collector as long as the base-emitter junction is reversed biased.

Answer 40

False (forward biased)

Question 41

The ? is designed to pass electrons from the emitter to the collector.

Answer 41

NPN BJT transistor

Question 42

Instead of electrons, the emitter emits "holes" which are collected by the collector.

Answer 42

PNP BJT transistor

Question 43

WRITE A IF IT DESCRIBES A SOLID STATE DEVICE AND B IF NOT. It is invented since 1950s.

Answer 43

B

Question 44

Insulator is an example of it.

Answer 44

A

Question 45

The device is within a vacuum bulb.

Answer 45

B

Question 46

Made up of cathode and anode.

Answer 46

B

Question 47

Opposite of vacuum technology.

Answer 47

A

Question 48

Used to build devices with a vacuum

Answer 48

B

Question 49

Needs 2 external sources to function

Answer 49

B

Question 50

Contrast to any device with any moving part.

Answer 50

A

Question 51

Depended on the continuous flow of electron charges

Answer 51

A

Question 52

Commonly grouped in two classes: n-type and p-type.

Answer 52

B