Question 1

When voltage is applied to the diac, it remains in the turned-on state until the applied voltage reaches a predetermined level.

Accepted Answer

A diac remains in the off state until the breakdown voltage is reached. Once it conducts, it will continue to do so until the current through it drops below a certain threshold, not a predetermined voltage level.

Question 2

____ means that a device conducts at a lower voltage than that which was applied to it.&#10;A) Negative current&#10;B) Negative resistance&#10;C) Positive current&#10;D) Positive resistance

Accepted Answer

Negative resistance is a property of certain electronic components where the device conducts at a lower voltage than that which was applied to it, effectively appearing to have a resistance that could be considered 'negative' in the context of Ohm's law. This is unlike the usual behavior observed in most electronic components, where an increase in voltage leads to a proportional increase in current, indicative of positive resistance.

Question 3

The primary function of a ____ is to phase shift a triac.&#10;A) switch&#10;B) inverter&#10;C) diac&#10;D) gate

Accepted Answer

The primary function of a diac is to phase shift a triac. A diac, which stands for "diode for alternating current," is a semiconductor device that is used to trigger a triac. When the voltage across a diac reaches a certain threshold, it switches on and allows current to flow, which in turn can trigger the triac to conduct, effectively phase shifting the current that the triac controls.

Question 4

SBSs are generally symmetrical to within about ____ volt(s).&#10;A) .3&#10;B) .5&#10;C) .7&#10;D) 1

Accepted Answer

SBSs (Silicon Bilateral Switches) are generally symmetrical to within about 0.3 volts, meaning their forward and reverse breakdown voltages are very close, typically within this range.

Question 5

The most common breakover voltage for a silicon bilateral switch is plus or minus ____ volts.&#10;A) 8&#10;B) 16&#10;C) 32&#10;D) 64

Accepted Answer

The most common breakover voltage for a silicon bilateral switch is plus or minus 8 volts.

Question 6

The diac is generally symmetrical to within about ____ volt(s).&#10;A) .3&#10;B) .5&#10;C) .7&#10;D) 1

Accepted Answer

The answer of The diac is generally symmetrical to within...

Question 7

The SBS has a gate lead that permits some control over the breakover voltage.

Accepted Answer

The Silicon Bilateral Switch (SBS) does have a gate lead that allows for some control over its breakover voltage, enabling the device to switch from a non-conducting to a conducting state at a predetermined voltage level.

Question 8

The breakover voltage of a diac will most often range between plus or minus16 volts and plus or minus 32 volts.

Accepted Answer

The breakover voltage of a diac typically ranges between ±16 volts and ±32 volts, which is the voltage range within which a diac starts to conduct electricity.

Question 9

The trigger operation of the diac is similar to that of a unijunction transistor, except the diac is a uni-directional device.

Accepted Answer

The diac is actually a bi-directional device, conducting current in both directions once its breakover voltage is reached, unlike a unijunction transistor which is a unidirectional device.

Question 10

There are three schematic symbols for the diac.

Accepted Answer

The diac typically has only one standard schematic symbol, which represents its bidirectional (two-way) current flow capability.

Deck 23: The Diac and Silicon Bilateral Switch