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ELEC 2 Flashcards

1
Q

Primary concerns when selecting a transformer for a power supply

A
  • primary power rating
  • frequency
  • secondary voltage and current rating
  • power handling capabilities
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2
Q

What is the use of a transformer

A
  • isolate the power supply from the AC voltage source
  • Step-Up/Down voltage
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3
Q

What is a rectifier

A

converts AC to pulsating DC

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4
Q

Disadvantage of full-wave rectifier

A

requires centre-tapped transformer

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5
Q

Advantage of full-wave rectifier

A

only requires two diodes

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6
Q

Disadvantage of bridge rectifier

A

requires four diodes

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7
Q

advantage of bridge rectifier

A

does not require transformer

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8
Q

charges when current is flowing and then discharges when current stops flowing, keeping a constant current flow on the output.

A

filter capacitor

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8
Q

How is a transformer connected to the power supply

A

AC power source is connected to the primary of the transformer

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9
Q

the frequency of the residual AC voltage after it has been rectified to DC in a power supply.

A

ripple frequency

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10
Q

This type of rectifier operates only during one-half of the input cycle

A

half-wave

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11
Q

This type of rectifier operates during both half of the cycles but its output voltage is half that of a half-wave rectifier for the same trans- former.

A

full-wave

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12
Q

This type of rectifier operates during both half of the cycles and does not require a centre tapped transformer

A

bridge rectifier

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13
Q

Simplest filter

A

filter capacitor

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14
Q

He first conceived the first integrated circuit.

A

Geoffrey W. A. Dummer

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15
Q

A radar scientist for the Royal Radar Establishment of the British Ministry of Defense.

A

Geoffrey W. A. Dummer

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16
Q

When did Geoffrey W. A. Dummer publish his idea

A

May 7. 1952

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17
Q

When did Geoffrey W. A. Dummer failed to build a successful circuit based on his model

A

1956

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18
Q

Was assigned in the summer of 1958 to develop a smaller electrical circuit. His idea evolved to fabricating all the compo- nents and the chip out of the same block (monolith) of semiconductor material

A

Jack Kilby

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19
Q

Most famous for his invention of the integrated circuit, for which he received the Nobel Prize in Physics in the year 2000

A

Jack Kilby

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20
Q

When did Jack Kilby constructed the first integrated circuit

A

September 1958

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21
Q

He solved Kilby’s problem of interconnecting all the components on the chip. He added the metal as a final layer and then removed some of it so that the wires needed to connect the components were formed.

A

Robert Noyce

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22
Q

Is a complete electronic circuit in a package no larger than that of a conventional low-power transistor.

A

Integrated Circuit

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23
Q

IC consist of

A
  • diode
  • transistor
  • resistor
  • capacitor
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24
Advantage of IC
small size
25
Disadvantage of IC
- cannot handle large amounts of current or voltage - cannot be repaired
26
IC consumes
5 - 15 milliamps of voltage
27
This construction technique begins with a circular silicon wafer 3 to 4 inches in diameter and about 0.010 inch thick.
Monolithic
28
How thick is thin film
0.0001 inch thick
28
This construction technique are formed on the surface of an insulating substrate of glass or ceramic, usually less than an inch square.
Thin film
29
In thin film integrated circuit how are resistors formed
Depositing tantalum or nichrome
30
This construction technique the resistors, capacitors, and conductors are formed on the substrate using a screen-printing process: A fine wire screen is placed over the substrate, and metallized ink is forced through the screen with a squeegee.
thick film
31
How thick is thick film
0.001 inch thick
32
This construction technique is formed using monolithic, thin-film, thick-film, and discrete components.
Hybrid
33
These components are used because they can handle relatively large amounts of power.
Discrete components
34
4 types of IC construction technique
- Monolithic - Thin film - Thick film - Hybrid
35
This DIP size has up to 100 electrical components
Small Scale Integration (SSI)
35
Most popular IC packaging
Dual in-line package (DIP)
36
This DIP size has 100 - 3000 electrical components
Medium Scale Integration (MSI)
37
This DIP size has 3000 - 100,000 electrical components
Large Scale Integration (LSI)
38
38
This DIP size has provides no qualitative leap from VLSI but is reserved to emphasize chip complexity in marketing.
Ultra Large Scale Integration (ULSI)
39
Uses uncut wafers containing entire computer systems including memory, was developed in the 1980s.
Wafer Scale Integration (WSI)
40
Purpose of IC package
Protection from moisture, dust, and other contaminants
41
IC package are made with what materials
plastic or ceramic
42
Operating temperature of ceramic
-55°C to +125°C
43
A small 8-pin DIP is called
mini-DIP
44
Component of the power supply unit that ensures a steady constant voltage supply through all operational conditions. It regulates voltage during power fluctuations and variations in loads. It can regulate AC as well as DC voltages.
voltage regulator
45
Voltage regulators used in low-voltage electronic devices are usually
integrated circuits
46
Are simple transistor-based devices usually packaged as ICs.
Linear regulators
47
Also called a step-down converter where the output voltage is always less than the input voltage.
Linear regulators
48
3 Pins of linear regulators
- input - ground - output
48
This type of linear voltage regulator has a variable element or active pass element such as a transistor is connected in series with the connected load.
series
48
Types of linear voltage regulator
- series - shunt
49
Common form of voltage regulator
series
50
Advantage of the series voltage regulator
current drawn is effectively used by the load
51
Advantage of linear voltage regulator
- simple to implement - low output ripple - fast load times - less noise and low electromagnetic interference - cost-efficient
52
Disadvantage of linear voltage regulator
- Low efficiency - performs only step-down - requires heat sink - requires large spaces
53
Is a circuit that uses a power switch, an inductor, and a diode to transfer energy from input to output.
Switching regulator
54
What is the power switch of the switching regulator
Field Effect Transistor (FET)
55
The basic components of the switching circuit can be rearranged to form
- buck - boost - fly back
56
Advantage of switching regulator
- efficient - less energy - step-up/down, isolate

ACWB FINALS (4 decks)

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