Practice Test (See related pages) 1 Unlike bipolar transistors and FETs, thyristors cannot be used for amplification. A) True B) False 2 A DIAC is referred to as a bi-directional diode thyristor because it can conduct current in either direction. A) True B) False 3 DIACs are primarily used in oscillator circuits. A) True B) False 4 A silicon controlled rectifier is a two-layer pn device. A) True B) False 5 An SCR does not operate in the same way as a rectifier diode. A) True B) False 6 Some SCRs can handle anode currents of less than 1 A and others can handle anode currents of several hundred amps. A) True B) False 7 The SCR remains in the on state as long as the anode current is less than the holding current. A) True B) False 8 Once the SCR is turned by the gate current, the gate loses all control. A) True B) False 9 The capacitor and resistor voltage in a series RC circuit are always 90° out of phase. A) True B) False 10 The minimum anode current required to keep the triac operating in the on state is called the current. 11 A three-terminal semiconductor device that has only one p-n junction is a(n) transistor. 12 The UJT's intrinsic standoff ratio is usually designated as . 13 Beyond the valley points labeled IV and VV (in the saturation region), the UJT's resistance is . 14 Semiconductor devices that are specifically designed for use in high-power switching applications are . 15 The DIAC is often used to provide a sharp trigger current pulse that can be used to turn on another thyristor known as a(n) . 16 Because a requires different gate currents for each mode of operation, it is asymmetrical. 17 The SCR will automatically turn off when the voltage drops to zero or goes negative. 18 The triac is equivalent to A) two DIACs connected in series B) two DIACs connected in parallel C) two SCRs connected in series D) two SCRs connected in parallel 19 The ratio of IMAGE HERE to the interbase resistance, RBB is called the A) resistive interbase ratio B) interbase standup ratio C) intrinsic standoff ratio D) intrinsic interbase ratio 20 Which of the following is not an application of high-power thyristors? A) heaters B) welders C) rf amplifiers D) voltage regulators 21 The region where the voltage drop across a DIAC decreases as the DIAC current increases is called A) reverse bias region B) negative resistance region C) negative breakdown region D) reverse resistance region 22 A three-layer, two-junction semiconductor device that has only two leads is a(n) A) SCR B) zener diode C) DIAC D) JFET 23 A four-layer pnpn device with an anode, cathode, and gate is called a(n) A) SCR B) silicon-controlled switch C) triac D) JFET 24 Once an SCR is turned on by gate current, the gate A) turns it off right away B) turns it off after the time set up by R and C C) loses all control D) current must be removed 25 A bi-directional semiconductor device that remains in a nonconducting state until the forward breakover voltage is reached is a(n) A) DIAC B) SCR C) triac D) E-MOSFET
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