65101. Which of the following devices has (have) four layers of semiconductor materials?
65102. Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs?
65103. What is the maximum current (rms) rating for commercially available LASCRs today?
65104. Which of the following areas is (are) applications of an SCS?
65105. How many terminals does a silicon-controlled switch (SCS) device have?
65106. What is the typical value of the triggering anode gate for SCS devices?
65107. What is the typical range of turn-off times for SCRs?
65108. Which of the following is (are) the advantages of the SCS over a corresponding SCR?
65109. This symbol is an example of a(n)________.
65110. Which of the following transistors is an SCR composed of?
65111. A thyristor is a ________-layer semiconductor material device.
65112. How many layers of semiconductor materials does a silicon-controlled rectifier (SCR) have?
65113. The peak and valley currents of the PUT are typically ________ those of a similarly rated UJT.
65114. The ________ the anode gate current, the ________ the required anode-to-cathode voltage to turn the SCS device on.
65115. SCRs have been designed to control powers as high as ________, with individual ratings as high as ________ at ________.
65116. The two-layer semiconductor diode has led to ________layer devices.
65117. The minimum operating voltage of the UJT is typically ________ that of a similarly rated PUT.
65118. In general, the triggering (turn-on) anode gate current is ________ the required cathode gate current.
65119. The four-layer devices with a control mechanism are commonly referred to as ________.
65120. ________ is(are) example(s) of applications of phototransistors.
65121. ________ in light intensity corresponds with ________ in collector current.
65122. A(n) ________ can be triggered in either direction.
65123. At –65ºC the minimum current that will trigger the series of an SCR is ________, while at +150ºC only ________ is required.
65124. The current induced by photoelectric effects is the ________ current of the transistor.
65125. The switching time of an opto-isolator ________ with increased current, while for many devices it is exactly the reverse.
65126. The ________ are the terminals of SCRs.
65127. An opto-isolator contains ________.
65128. The method(s) for turning off an SCR is (are) categorized as ________.
65129. In a programmable unijunction transistor (PUT), the ________ can be controlled through a couple of resistors and the supply voltage.
65130. The ________ are the terminals of an SCS.
65131. The SCRs have typical turn-on times of ________ in the regeneration action.
65132. In the conduction region, the dynamic resistance of the SCR is typically ________ to ________.
65133. The anode gate connection can be used to turn the SCS device ________.
65134. ________ is (are) the element(s) of a unijunction transistor's equivalent circuit.
65135. To turn on an SCS device, a ________ pulse must be applied to the anode gate terminal; to turn off the device, a ________ pulse is required.
65136. In a half-wave variable-resistance phase control operation, the control cannot be extended past a ________ phase displacement.
65137. ________ are areas of application for SCRs.
65138. Which of the following devices does not have a cathode terminal?
65139. Today, the SCR is more widely used than the TRIAC.
65140. Which of the following devices is unquestionably of the greatest interest today?
65141. Which of the following devices has a negative-resistance region in its characteristics curve?
65142. Determine RB1 for a silicon PUT if it is determined that h = 0.84, VP = 11.2 V, and RB2 = 5 k.
65143. A silicon power transistor is operated with a heat sink ( SA = 1.5ºC/W). The transistor, rated at 150 W (25ºC), has JC = 0.5º C/W, and the mounting insulation has CS = 0.6 ºC/W. What is the maximum power that can be dissipated if the ambient temperature is 50ºC and TJmax = 200 ºC?
65144. Refer to this figure. The dc voltage on the collector, VC, is
65145. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings?
65146. Class ________ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input.
65147. You find that there is an input signal on the base of Q1 and Q2. However, there is no output signal. You then measure the dc voltages on Q2 and find them to be all 0 V. The possible trouble might be
65148. Which type of power amplifier is biased for operation at less than 180º of the cycle?
65149. Class AB operation is ________ operation.
65150. The principal advantage(s) of MOSFETs over BJTs is (are)
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