Exam 34: Thyristors

A DIAC is a three-layer, two-junction semiconductor device that has only two leads.

A device that can control ac power, because it can conduct in either direction, is called a triac.

Which triac triggering mode is the most sensitive?

______________ are primarily used in power control circuits.

Along with transistors and FETs, thyristors can be used for amplification.

A bi-directional semiconductor device that remains in a nonconducting state until the forward breakover voltage is reached is a(n)

Because a triac requires different gate currents for each mode of operation, it is ______________.

The DIAC is often used to provide a sharp trigger current pulse that can be used to turn on another thyristor known as a

Thyristors can operate only in the switching mode, where they act like either an open or closed switch.

What component controls the frequency of the UJT relaxation oscillator?

Which triac triggering mode is the most sensitive?

An SCR operates in the same way as a rectifier diode.

An SCR differs from an ordinary rectifier diode in that the SCR will remain in a(n) ______________ state, although forward biased, until the forward breakover voltage is reached.

The ______________ transistor is a three-terminal semiconductor device that has only one p-n junction.

What is the function of D₅ in the circuit shown in Figure 32-14?

Thyristors (can/cannot) be used for amplification.

DIACs are primarily used in power control circuits.

Thyristors are semiconductor devices that are specifically designed for use in high-power switching applications.

The region where the voltage drop across a DIAC decreases as the DIAC current increases is called

Once an SCR is turned on by gate current, the gate