Exam 34: Thyristors

A four-layer pnpn device with an anode, cathode, and gate is called a(n)

A three-layer, two-junction semiconductor device that has only two leads is a(n)

SCRs can only handle anode currents of less than 1 A.

A three-terminal semiconductor device that has only one p-n junction is a(n)

______________ can be designed to handle much higher load currents than triacs.

Low current SCRs resemble an ordinary transistor with three leads protruding from the body.

SCRs can only conduct in one direction.

The ______________ standoff ratio of a UJT is usually designated as ? or eta.

A DIAC is referred to as a unidirectional diode thyristor because it can conduct current in only one direction.

The capacitor and resistor voltage in a series RC circuit are always 180° out of phase.

Beyond the valley points labeled I_V and V_V (in the saturation region), the UJT's resistance is

A silicon controlled rectifier is a four-layer pnpn device.

Some triacs have built-in ______________ which reduces the number of components and connections in some cases.

What is often used in conjunction with a triac to ensure that the triggering time is the same for both the positive and negative alternation of the applied voltage?

The SCR remains in the on state as long as the anode current is greater than the holding current.

Which of the following is not an application of high-power thyristors?

The ratio ofto the interbase resistance, R_BB is called the

Semiconductor devices that are specifically designed for use in high-power switching applications are

The UJT's intrinsic standoff ratio is usually designated as

A device that can control ac power, because it can conduct in either direction is called a(n) ______________.