Part66EASA Module4.1.1bDiode(1of3)

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Part66EASA Module4.1.1bDiode(1of3)

(a)Diode symbols; Diode characteristics and properties; Diodes in series and parallel; Main characteristics and use of silicon controlled rectifiers (thyristors),light emitting diode, photo conductive diode, varistor, rectifier diodes; Functional testing of diodes.
(b) (b)Materials, electron configuration, electrical properties; P and N type materials: effects of impurities on conduction, majority and minority characters; PN junction in a semiconductor, development of a potential across a PN junction in unbiased, forward biased and reverse biased conditions; Diode parameters: peak inverse voltage, maximum forward current, temperature, frequency, leakage current, power dissipation; Operation and function of diodes in the following circuits: clippers, clampers, full and half wave rectifiers, bridge rectifiers, voltage doublers and triplers; Detailed operation and characteristics of the following devices: silicon controlled rectifier (thyristor), light emitting diode, Schottky diode, photo conductive diode, varactor diode, varistor, rectifier diodes, Zener diode.

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A band pass filter excludes frequencies.

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below the frequency required only.

above and below the frequency required.

above the frequency required only.

PIN diodes are used mainly for.

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linear rectifiers.

fast switching devices.

voltage operated rectifiers.

In an unbiased p-n junction, current flow is.

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zero, because equal but opposite currents are crossing the junction.

zero, because no charges are crossing the junction.

due to the diffusion of minority carriers only.

Tunnel diodes have the following characteristics.

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Heavily doped P-N junction with an extremely narrow depletion region.

Lightly doped P and N regions and a high reverse breakdown voltage.

Lightly doped P region, heavily doped N region and has a fast response time.

What type of diode when forward biased holes and electrons recombine producing photons?.

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LED.

Photodiode.

Gunn.

If forward bias is increased from zero on a p-n junction, a rapid increase in current flow for a relatively small increase in voltage occurs.

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when the flow of minority carriers is sufficient to cause an avalanche breakdown.

when the depletion layer becomes larger than the space charge area.

only after the forward bias exceeds the potential barrier.

The capacitance of a varactor diode is.

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inversely proportional with reverse bias voltage.

a linear function of applied reverse bias voltage.

directly related to the forward bias voltage.

What is a schottky diode used for?.

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Rectification.

Stabilization.

Very high frequency applications.

Avalanche breakdown occurs when.

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reverse bias exceeds a certain value.

forward bias exceeds a certain value.

forward current becomes excessive.

What diode is used to stop power spikes in a coil?.

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Gunn diode.

Schottky diode.

Two directional zener diode.

When a hole diffuses from a p-region to the n-region it.

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becomes a minority carrier in the n-region.

lowers the potential barrier.

raises the potential barrier.

In a diode clamper, if the resistor is removed making the time constant equal to C x r where r is the reverse resistance of the diode, this will ensure a.

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long time constant.

short time constant.

Very Long Time Constant.

The junction barrier offers opposition to only.

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holes in the p-region.

free electrons in the n-region.

majority carriers in both regions.

A semiconductor doped with an element having a valency of 5 will produce.

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an N type material.

either an N type or a P type depending on what type of semiconductor material is used.

a P type material.

A triac is a type of.

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thermistor.

transistor.

thyristor.

With a small amplitude voltage, what type of diode would you use to produce the output waveform?.

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Gunn.

Zener.

Schottky.

If a junction diode is reverse biased too far, the output current would.

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reverse direction.

cease to flow.

increase.

To enable an IMPATT diode to operate correctly, it must be.

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connected to a resonant circuit.

used in its reverse bias mode.

operated in its negative resistance range.

A zener diode is designed to operate.

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below its breakdown voltage.

either above or below its breakdown voltage.

above its breakdown voltage.

What type of diode would be used to stop voltage spikes across a coil of a relay?.

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Gunn diode.

Double acting diode.

Schottky diode.

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