Mixed Quiz (See related pages) 1 The operation of a thyristor involves negative feedback. A) True B) False 2 A transistor circuit that remains in either the closed or opened state indefinitely is referred to as an oscillator. A) True B) False 3 The only way to close a transistor latch circuit is by breakover. A) True B) False 4 A silicon unilateral switch (SUS) is another name for the zener diode. A) True B) False 5 The ideal approximation of a four-layer diode is an open switch when saturated and a closed switch when cut off. A) True B) False 6 The Schottky diode is the most widely used thyristor. A) True B) False 7 A gate voltage can turn an SCR on but a gate voltage cannot turn it off. A) True B) False 8 A gate voltage can turn a power FET on but a gate voltage cannot turn it off. A) True B) False 9 With an SCR crowbar circuit, a fuse or current limiting is not needed to prevent damage to the power supply. A) True B) False 10 Commercially available SCRs have anode currents that extend as high as A. 11 The angle at which the SCR is triggered on is called the angle. 12 If a high-speed switching transient appears on the supply voltage, its rate of rise can be reduced by using a(n) circuit. 13 The triac acts like two in reverse parallel. 14 The triac can control current in direction(s). 15 A device that can be used to form a pulse generating circuit called a relaxation oscillator is a(n) . 16 A device that is replacing UJTs and PUTs in many of their applications is the amplifier. 17 An SCR can be tested by using a(n) . 18 The output of a comparator circuit is negative A) when the inverting input is greater than the noninverting input B) when the noninverting input is greater than the inverting input C) when the supply voltage is positive D) when the supply voltage is negative 19 The diac is sometimes called a A) dual inline ac device B) silicon bi-directional switch C) directional switch D) snubber 20 The IGBT is a A) normally off high input impedance device B) normally off low input impedance device C) normally on high input impedance device D) normally on low input impedance device 21 A thyristor that is designed for easy opening with a reverse-biased trigger is the A) triac B) SCR C) gate-controlled switch D) IGBT 22 The programmable unijunction transistor is considered programmable because A) the gate voltage can be determined by an external voltage divider B) the gate voltage is programmed using software C) the anode can be modified by adding resistors D) the cathode can be modified by adding resistors 23 A semiconductor device that uses internal feedback to produce switching action is a A) transistor B) zener diode C) thyristor D) rectifier 24 Which thyristor is the most widely used? A) diac B) triac C) SCR D) four-layer diode 25 With an SCR crowbar, what else is needed to prevent damage to the power supply? A) coupling capacitor B) fuse C) speakers D) transformer
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