数字电子技术期末试卷.docVIP

重庆大学数字电子技术I(双语)课程试卷  2006~2007 学年 第2学期 开课学院：通信工程学院课程号 考试日期： 考试时间： 120 分钟 题 号 一 二 三 四 五 六 七 八 九 十 总 分 得 分 注：1.大标题用四号宋体、小标题及正文推荐用小四号宋体；2.按A4纸缩小打印 I. Multiple choice (1 pts/ea, 15 pts total) 1) How is the invalid state problem associated with the S-R flip-flop overcome? a) The R terminal is eliminated. b) The R input is fed through an inverter. c) A single input terminal is used (D). d) Both B and C are correct. 2) This is the timing diagram for a 2-input ________ gate. a) NAND b) AND c) Exclusive-OR d) OR 3) What is the meaning of RAM, and what is its primary role? a) Random Access Memory; it is memory that is used for short-term temporary data storage within the computer. b) Readily Available Memory; it is the first level of memory used by the computer in all of its operations. c) Random Access Memory; it is memory that can be reached by any sub-system within a computer, and at any time. d) Resettable Automatic Memory; it is memory that can be used and then automatically reset, or cleared, after being read from or written to.. 4) Which rule of Boolean algebra does the example below represent? a) A + 1 = 1 b) A ? 0 = 0 c) A + 0 = A d) A ? 1 = A 5) The circuit shown below is ________. a) decade counter b) BCD counter c) Johnson counter d) ring counter 6) The circuit below is most likely a ________. a) full-adder b) demultiplexer c) multiplexer d) comparator 7) For a negative-logic pulse, the trailing edge is the ________. a) negative-going edge b) positive-going edge c) HIGH-to-LOW transition d) falling edge 8) The 2s complement of binary 110110 is ________. a) 0010012 b) 0010102 c) 1101002 d) 1010102 9) Which of the following statements best describes the operation of an UP/DOWN SYNCHRONOUS COUNTER? a) The counter can be reversed, but must be RESET before counting in the other direction. b) In general, the counter can be reversed at any point in its counting sequence. c) The counter