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Transcript

Name: ________________________ Class: ___________________ Date: __________ ID: A Digital Electronics Final Review True/False Indicate whether the statement is true or false. ____ 1. The current entering a node must equal the current leaving the node. ____ 2. A digital audio system makes a copy of the waveform. ____ 3. The binary number system is a positional notation system. ____ 4. The number of cells in a K-map (Karnaugh map) is always a power of 2, usually 4, 8, or 16. ____ 5. When grouping terms for simplification, every pair of terms must have at least one term that belongs only to that pair. ____ 6. A demultiplexer performs the reverse function of a multiplexer. ____ 7. Latches and flip-flops are used as integral parts of more complex devices. ____ 8. The simplest memory device is the D flip-flop. Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 9. _____ states that the voltage across a component is equal to the resistance of the component multiplied by the current through the component. a. b. Kirchhoff’s Voltage Law The SI System c. d. Ohm’s Law Kirchhoff’s Current Law ____ 10. A _____ is a junction of electronic components. a. b. parallel series c. d. circuit node ____ 11. Seven thousand volts can be expressed as a. 7 MV b. 7 kV c. d. 7000 V b and c ____ 12. Express 7.32 × 10 7 in engineering notation a. 732 × 10 7 b. 73.2 × 10 6 c. d. .732 × 10 6 732 × 10 6 1 Name: ________________________ ID: A ____ 13. At currents as low as _______, death is possible. a. b. 15 mA 5 mA c. d. 25 mA 50 mA ____ 14. The most common component in electronics is/are _____. a. b. a solder joint resistors c. d. capacitors alloys ____ 15. ______ usually look like a can with legs (leads) coming from the bottom. a. b. Most resistors Ceramic capacitors c. d. Tantalum capacitors Electrolytic capacitors ____ 16. Lightning is the discharge of _____ between the atmosphere and the ground. a. b. current voltage c. d. static electricity electrocution ____ 17. Resistors are _____; in other words, they can go into a circuit in either direction. a. b. not polarized axial-leaded c. d. polarized tin-tipped ____ 18. _____ are typically found as axial-lead packages. a. b. Ceramic capacitors Electrolytic capacitors c. d. Tantalum capacitors Resistors ____ 19. A proton is: a. b. c. d. the center of an atom the fundamental building block of molecues a positively charged particle found in the nucleus of the atom a negativley charged particle orbiting the nucleus of an atom ____ 20. A circuit built functionally the same as a circuit that is to be tested is a _____. a. b. simulation schematic c. d. programmable device prototype ____ 21. The atomic number of an element is the number of _____ in the nucleus of an atom of that element. a. b. molecules noble elements c. d. 2 protons electrons Name: ________________________ ID: A ____ 22. A _____ is a copper line on a circuit board connecting one component to another; it is a path for current to flow on a circuit board. a. b. conductor trace c. d. breadboard node c. d. rising and falling edge most significant bit ____ 23. The rightmost bit of a binary number is the: a. b. rising edge least significant bit ____ 24. For the binary numbers from 0000 to 1111, the decimal equivalents are _____. a. b. 0 to 10 0 to 15 c. d. 1 to 15 1 to 10 ____ 25. An _______ is shown by a bubble or an arrow symbol on the affected terminal. a. b. active HIGH inversion c. d. active LOW opposite logic level ____ 26. A _______ directs a single input signal to one of several outputs. a. b. demultiplexer CMOS analog switch c. d. multiplexer priority encoder ____ 27. In the expression x + y = z, x and y are the ______. a. b. augends operands c. d. addends sum bits ____ 28. In the following multiplication problem what is the multiplier? 15 x 43 645 a. b. 15 43 c. d. both 15 and 43 645 ____ 29. ______ such as adders, multiplexers, and decoders are useful on their own and in combination as part of more complex circuitry. a. b. Enable signals System level components c. d. 3 Control lines Combinational logic functions Name: ________________________ ID: A ____ 30. The difference between a latch and a flip-flop is: a. b. c. d. they are activated by opposite logic levels the present combination of inputs the condition under which the stored bit is allowed to change the fixed intervals during which changes occur ____ 31. ______ is the part of a signal where the logic level is in transition from a LOW to a HIGH a. b. Rising edge Leading edge c. d. Trailing edge Falling edge c. d. State machines Shift registers c. d. four state variables no state variables ____ 32. ______ are circuits that store and move data. a. b. Counters Ring counters ____ 33. A state machine that has two states requires: a. b. only one state variable two state variables Completion Complete each statement. 34. Complete a truth table for the following logic circuit and write the logic expression.: 35. Complete a truth table for the following logic circuit and write the logic expression.: 4 Name: ________________________ ID: A 36. Draw the logic circuit for the following expression (A+B)C = D 37. Hertz is the unit of ___________ 38. The unit of resistance is ____________ 39. The unit of voltage is _________ 40. The unit of current is ______________ 41. The unit of capacitance is ______________ 42. The unit of power is ____________ 43. Express 2000000 in scientific notation 44. Express 0.002 in scientific notation 45. Express 2.5 × 10 −6 as a decimal 46. Express 5 × 10 2 as a decimal 47. Express 4500000 in S.I. for a resister 48. Express .000008 in S.I. for current 49. Convert 7 mA to µA Short Answer 50. What effect does a conductor have on electrical current? 51. What effect does an insulator have on electrical current? 5 Name: ________________________ ID: A 52. Use the chart to find the following resister size. (Brown/Black/Brown/Gold) ______________ 6 Name: ________________________ ID: A Problem 53. Find I T ,V R1 ,V R2 ,R T for the given circuit. 54. Find I T ,I R1 ,I R2 ,R T for the given circuit. 7 Name: ________________________ ID: A 55. Find I T ,I R1 ,I R2 ,R T ,V R3 ,V R2 ,V R1 for the given circuit. 56. Convert the decimal number 23 to binary 57. Convert the decimal number 30 to binary 58. Convert the binary number 1010 to decimal 59. Convert the binary number 111000 to decimal 60. Simplify using Boolean Algebra A(A + AB) = 61. Simplify using Boolean Algebra XY+ XY = 62. Simplify using Boolean Algebra ZW + ZW + XZW = 63. Simplify using De Morgans Theorems X +Y 64. Simplify using De Morgans Theorems A 8 Name: ________________________ ID: A 65. Simplify using De Morgans Theorems PQR + P QR 66. Write the minterms for the following truth table: A 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 B 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 C 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Output 0 1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 Other 67. Know the following: Basic structure of an atom Ohms law What a breadboard is used for What a node is Units for current, voltage and resistance Kirchoff’s Current law Kirchoff’s Voltage law What an insulator is What a conductor is How to solve a basic series circuit, basic parallel circuit and a basic series combine with a parallel circuit. 9 ID: A Digital Electronics Final Review Answer Section TRUE/FALSE 1. 2. 3. 4. 5. 6. 7. 8. ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: T F T T T T T T PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: 1 1 1 1 1 1 1 1 PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 MULTIPLE CHOICE 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: C D D B D B D C A D C D C B B B C A B B D C A D A 1 ID: A COMPLETION 34. ANS: ABCD E 0000 0 0001 0 0010 0 0011 0 0100 0 0101 1 0110 1 0111 1 1000 0 1001 1 1010 1 1011 1 1100 0 1101 1 1110 1 1111 1 PTS: 1 35. ANS: ABC D 000 0 001 0 010 0 011 1 100 0 101 1 110 0 111 1 (A+B)(C+D)=E (A+B)C=D PTS: 1 36. ANS: PTS: 1 37. ANS: Frequency PTS: 1 2 ID: A 38. ANS: Ohm PTS: 1 39. ANS: Volt PTS: 1 40. ANS: Ampere PTS: 1 41. ANS: Farad PTS: 1 42. ANS: Watt PTS: 1 43. ANS: 2 × 10 6 PTS: 1 44. ANS: 2 × 10 −3 PTS: 1 45. ANS: .0000025 PTS: 1 46. ANS: 500 PTS: 1 47. ANS: 4.5MΩ PTS: 1 48. ANS: 8µA PTS: 1 49. ANS: 7000µA PTS: 1 SHORT ANSWER 50. ANS: A conductor is a material that allows electrical current to flow through it easily, with a very low resistance. PTS: 1 51. ANS: An insulator is a material that does not allow electrical current to pass through, with a very high resistance. PTS: 1 3 ID: A 52. ANS: 100Ω ± 5% PTS: 1 PROBLEM 53. ANS: I T = 6mA V R1 = 4.8V V R2 = 7.2V R T = 2kΩ PTS: 1 54. ANS: I T = 24mA I R1 = 16mA I R2 = 8mA V R1 = 12V V R2 = 12V R T = 500Ω PTS: 1 55. ANS: Reduce to a series circuit to find R T , then use R T and V to find I T Find vdrop across R 3 . Subtract V R3 from 12 volts to get V R1 and V R2 use V R1 and V R2 to calculate I R2 and I R1 I T = 11.6mA I R1 = 8.2mA I R2 = 3.42mA V R3 = 5.82V V R1 = V R2 = 6.17V R T = 1029.4Ω PTS: 1 56. ANS: 10111 PTS: 1 57. ANS: 11110 PTS: 1 4 ID: A 58. ANS: 10 PTS: 1 59. ANS: 56 PTS: 1 60. ANS: 0 PTS: 1 61. ANS: X PTS: 1 62. ANS: W PTS: 1 63. ANS: XY PTS: 1 64. ANS: A PTS: 1 65. ANS: 0 PTS: 1 66. ANS: ABCD + ABCD + ABCD PTS: 1 OTHER 67. ANS: See your notes or google PTS: 1 5