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ATO Test 4 Practice Questions with Solutions
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Exam of 5 pages for the course ATO at ATO (ATO Test 4)
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ATO Test 4Diode – answer a uni-directional device which allows current to flow in one direction
Semiconductor Materials - answer offers less resistance to electron flow than insulators,
but more than conductors
Most used semiconductors - answer Silicon and Germanium
Doping - answer Process of adding impurities to semiconductor material
Doping Process - answer Restructures the semiconductor to require less energy to
produce current flow by lowering resistance of the material. (Allowing more current)
N-Type Semiconductor - answer High concentration of electrons , majority carriers of
current.
Low concentration of holes, minority carriers of current
P-Type Semiconductor - answer High concentration of holes , majority carriers of
current.
Low concentration of electrons, minority carriers of current
Recombination - answer When an electron breaks free from another atom, it leaves a
hole.
Bias - answer after voltage is applied to a semiconductor, it directs the flow of holes in
electrons.
(T/F) Holes and Electrons are present in both type materials. - answer True
Depletion Region - answer The region created when the charge carriers (i.e.
electrons/holes) diffuse away.
Forward Bias - answer Offers very little resistance to current flow. Must have a potential
high enough to overcome barrier potential
Reverse Bias - answer Opposes current flow, so no current will flow. Voltage is
insufficient or bias polarities are reversed.
Breakdown - answer Excessive biased voltage. Causes bonds in the depletion region to
break apart.
Zener effect - answer Reverse-bias breakdown below 6V
, Avalanche Effect - answer Reverse bias breakdown above 6V
Diode Types - answer Junction Diodes
Light-Emitting Diodes (LEDs)
Zener Diodes
Junction Diode - answer Allows current to flow in one direction only. When voltage is on,
forward bias, it acts as a closed switch.
Zener Diode - answer Used to set a voltage reference or to regulate voltage. When
placed in reverse bias in a circuit it acts as a voltage regulator. I forward bias it acts as a
junction diode.
A rapid increase of reverse bias current might destroy the diode unless the
______________ is placed in series with a zener diode. - answer Current Limiting
Resistor
Load resistance is - answer A fixed value
Light Emitting Diode (LED) - answer Special type of p-n junction diode that emits light
when positive voltage is applied.
When does the LED light up? - answer When given a forward voltage rating
Rectifiers - answer Conducts very heavily when forward bias. Offers very high
resistance when reversed biased. Converts AC to pulsing DC.
Switches (Signal Diode) - answer Opens or closes a circuit in proper conditions. Limits
the amplitude.
Clamper - answer used to add a DC voltage level to a AC input signal. Caused by fast
charging and slow discharging.
Shockley Diode - answerA four layer, two electrode semiconductor diodes used for
producing trigger pulses when turned on.
Two outermost materials are ____________, two innermost materials are
_____________. - answerForward biased, Reverse Biased.
Silicon Controlled Rectifier (SCR) - answerEssentially a Shockley diode with an
electrode (gate) connected to the internal P material.
Conditions for destruction of a Diode - answerExceeding the max peak reverse voltage
rating.
Exceeding maximum power dissipation rating
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