Lecture 3

Question 1

Its output is high if all inputs are high. For other input, the output is low.

Answer 1

AND

Question 2

Its output is high if one or more inputs are high.

Answer 2

OR

Question 3

The process of converting an ac signal into a dc signal

Answer 3

Rectification

Question 4

It is used in power supplies to convert ac voltages to dc voltages.

Answer 4

Rectifiers

Question 5

Types of rectification

Answer 5

Half-wave rectification & Full-wave rectification

Question 6

It changes ac voltages based on the turns ratio between the primary and secondary.

Answer 6

Transformer

Question 6

It eliminates the fluctuations in the rectified voltage and produces a relatively smooth dc voltage.

Answer 6

Filter

Question 7

A circuit that maintains a constant dc voltage for variations in the input line voltage or in the load.

Answer 7

Regulator

Question 8

Simplest rectifier circuit

Answer 8

Half wave rectifier

Question 9

It is the voltage rating that must not be exceeded in the reverse-bias region or the diode will enter the Zener avalanche
region.

Answer 9

Peak inverse voltage (PIV) [or PRV
(peak reverse voltage)]

Question 10

It produces an output voltage during one-half (180 degrees) of the input ac signal.

Answer 10

Half wave rectifier

Question 11

Produces an output voltage during the entire cycle (360 degrees) of the input ac signal which means it uses both cycle of the input signal for its output.

Answer 11

Full wave rectifier

Question 12

It has the ability to “clip” off a portion of the input signal without
distorting the remaining part of the alternating waveform.

Answer 12

Clippers

Question 13

There are two general categories of clippers

Answer 13

series and parallel

Question 14

It is defined as one where the diode is in series with the load

Answer 14

Series clippers

Question 15

It has the diode in a branch parallel to the load.

Answer 15

Parallel clipper

Question 16

It is a network constructed of a diode, a resistor, and a capacitor that shifts a waveform to a different dc level without changing the appearance of the applied signal.

Answer 16

Clamper

Question 17

In clampers, as the capacitor
voltage increases the charging current ____

Answer 17

decreases

Question 18

It is employed to maintain a relatively low transformer peak voltage while stepping up the peak output voltage to two, three, four, or more times the peak rectified voltage.

Answer 18

Voltage-multiplier circuits

Question 19

Voltage multiplier circuits are typically made up of ___

Answer 19

diodes and capacitors

Question 20

Operates on reversed biased condition, maintain its voltage when the breakdown is reached

Answer 20

Zener Diodes

Question 21

Used in high frequency range
due to its quick response time and lower noise figure

Answer 21

Schottky Diode (Hot carrier diode)

Question 22

Light sensitive diode that narrows the depletion region when there is a presence of light

Answer 22

Photo diode

Question 23

Give off visible light when it is
properly biased

Answer 23

Light Emitting Diode (LED)

Question 24

It is a diode that always operates in reverse bias and is doped to maximize the inherent capacitance of the depletion region.

Answer 24

Varactor

Question 25

A large exposed surface area on one layer of the semiconductive material permits the photons to be emitted as visible light.

Answer 25

Electroluminescence

Question 26

The term laser stands for

Answer 26

light amplification by stimulated emission of radiation

Question 26

A device that operates in reverse bias where I(lambda) is the reverse light current

Answer 26

Photodiode

Question 26

also known as a photovoltaic cell,
is a type of semiconductor device that converts light into electrical energy.

Answer 26

Solar cell

Question 27

High-current diodes used primarily in high-frequency and fast-switching applications. They are also known as hot-carrier diodes.

Answer 27

Schottky diodes

Question 28

It consists of heavily doped p and n regions separated by an intrinsic (i) region.

Answer 28

PIN diode