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ABE-NZ > Ana-Test > Flashcards

Ana-Test Flashcards

1
Q

How many Valance electrons does a silicon atom have

A

4

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2
Q

what is the most widely used semiconductor

A

none of the above

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3
Q

When voltage is applied to a semiconductor then holes will flow

A

none of the above

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4
Q

what causes the depletion zone

A

recombination

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5
Q

in a silicon diode the reverse current is usually

A

very small

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6
Q

what about the breakdown voltage of the zener diode

A 
a reverse-biased Zener diode exhibits a 
controlled breakdown and allows 
the current to keep 
the voltage 
close to the 
Zener breakdown voltage.
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7
Q 
what happens if 
conventional diode is 
reverse-biased 
above its 
reverse breakdown voltage.
A 
reverse bias breakdown voltage is 
exceeded, 
conventional diode is subject to 
high current due to 
avalanche breakdown.
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8
Q

For example, a diode with

A 
a Zener breakdown voltage of 3.2 V 
exhibits a voltage drop of very 
nearly 3.2 V across a 
wide range of 
reverse currents
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9
Q

1 thing about picture of a Zener Graph

A 
change of voltage scale between the 
forward biased and 
reverse biased (negative)
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10
Q

Symbol for Zener

A

Arrow and Crowbar

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11
Q

Describe the zener diode

A 
When in parallel with a 
variable voltage source so that it is 
reverse biased
conducts when the 
voltage reaches the diode's 
reverse breakdown voltage.
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12
Q

Zener used as

A

Reference Voltage

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13
Q

any semiconductor is

characterized as

A

negative temperature co efficient

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14
Q

Breakdown current
does not destroy the
zener diode
providing it doesn’t

A

go above

maximum breakdown Voltage

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15
Q

a shotkey diode is

characterized as

A

same polarity
of carriers on
both sides

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16
Q

Define PIV

A 
Peak Inverse Voltage
Line down
Reverse Bias
Just Before
Reverse Breakdown Voltage
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17
Q

Define Reverse Breakdown voltage

A

Line down
Reverse Bias
Just after
Drop off

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18
Q

Define threshold voltage

A 
an amount of 
"forward" bias where the 
current flowing becomes 
measurable
typically 0.7 VDC.
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19
Q

Define leakage current

A 
Current that 
the diode will 
leak when a 
reverse voltage is 
applied to it.
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20
Q

Label Axis of
SI and
Ge Diode

A

IF

VR VF

     IR
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21
Q

SI Line

A

Long
Sideways
Zed

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22
Q

GI Line

A

Short
Sideways
Zed

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23
Q

Reverse blocking region

A 
The block of reverse Bias 
in which
Diode is blocking current
Before
Breaking down
24
Q

What is reverse voltage rating

A

Maximum voltage

before damage

25
Q

Where is max allowable power dissipation

A

data sheets

26
Q

Out of Circuit Test: Step 1

A

Power Off

Lift one end of Diode

27
Q

Out of Circuit Test: Step 2

A

Ohm Meter
Connect Pos to Pos
Then Pos to Neg

28
Q

Out of Circuit Test : One reading is small

A

One reading is small
compared to other
GOOD

29
Q

Out of Circuit Test: Both readings are low

A

Both readings are low

SHORTED

30
Q

Out of Circuit Test: Both readings are High

A

Both readings are High

OPEN CIRCUIT

31
Q

What is rectification

A

Turning AC into DC

32
Q

Half Wave Rectifier Step 1

A

Source(Vpri)
Volt Primary
Hertz

33
Q

Half Wave Rectifier Step 2

A

Transformer(T1)
Turns:Turns
Voltage Secondary(Vsec)

34
Q

Half Wave Rectifier Step 3

A

1 x Diode (VD)

0.7 Volts

35
Q

Half Wave Rectifier Step 4

36
Q

Half Wave Rectifier Step 5

A

VRL is just the top half of cycle

37
Q

Half Wave Rectifier Step 6

A

Voltmeter In Parallel

Ohmmeter In Series

38
Q

Transformer Formula

A

Npr = Vpr = Isec

Nsec Vsec Ipr

39
Q

Center Tapped Full Wave Rectifier Step 1

A

Source(Vpri)
Volt Primary
Hertz

40
Q

Center Tapped Full Wave Rectifier Step 2

A

Transformer(T1)
Turns:Turns
Voltage Secondary(Vsec)
Center Tap

41
Q

Center Tapped Full Wave Rectifier Step 3

A

2 x Diode (VD)
0.7 Volts
Loop

42
Q

Center Tapped Full Wave Rectifier Step 4

A

Off loop
RL
Ground

43
Q

Full Wave Bridge Rectifier Step 1

A

Source(Vpri)
Volt Primary
Hertz

44
Q

Full Wave Bridge Rectifier Step 2

A

Transformer(T1)
Turns:Turns
Voltage Secondary(Vsec)

45
Q

Full Wave Bridge Rectifier Step 3

A

4 x Diode (VD)
0.7 Volts
Loop
Center Tap

46
Q

Full Wave Bridge Rectifier Step 4

A

Off loop
RL
Ground

47
Q

Filter

A

Full Wave Bridge Rectifier

+ Capacitor parallel to RL

48
Q

Describe Clipping Circuit

A

Used to clip off part of an input signal without distorting the rest of the wave

49
Q

Clipping Circuit Step 1

A

Resistor

Line across top

50
Q

Clipping Circuit Step 2

A

2 Diodes

Alternating bias

51
Q

Clipping Circuit Step 3

A

2 Batteries
Make up
Remainder

52
Q

Polarity Circuit

A

A diode in positive line

53
Q

Polarity Circuit Description

A 
Prevent circuit
from being
Energized with 
Supply 
Wrong way round
54
Q

Describe free wheeling diode

A

A conductive pass that handles back EMF form relays

55
Q

Free Wheeling Diode Circuit

A

A relay
A path around
A reverse biased Diode

ABE-NZ (25 decks)

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