Quiz – Applications of Digital Electronics – Displays & Timers

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  A)    TRUE OR FALSE (Bubble In A for TRUE, B for FALSE on the computer card)

  1. Four NAND gates can be wired together to simulate an EOR gate

a) TRUE                                  b) FALSE

2. The NAND gate is often called the Universal Gate

a) TRUE                                  b) FALSE

3. In a Seven-Segment display the number one is formed when pin 13 is connected to ground

a) TRUE                                  b) FALSE

  4. A seven-segment display can be used to form letters and numbers

a) TRUE                                  b) FALSE

  5. A seven-segment display is often called an alphanumeric display

a) TRUE                                  b) FALSE

  B) Multiple Choice – Bubble-in the correct response on the computer card

  6. The name EOR gate means______________ OR gate

a) external                    b) electronic                 c) emulated                   d) exclusive

  Use the following table (pin-out of a seven-segment display) to answer questions 7 to 12 

7. Pin # 10 controls segment_________

a) A                       b) B                 c) C      d) D            e) E

8. Pin # 1 controls segment ______________

a) A                       b) B                 c) C      d) D            e) E

9. Pin # 13 controls segment ______________

a) A                       b) B                 c) C      d) D            e) E

10. Pin # 7 controls segment ______________

a) A                       b) B                 c) C      d) D            e) E

11. Pin # 8 controls segment ______________

a) A                       b) B                 c) C                 d) D                        e) E

12. Segment display “f” is controlled by pin # ____________________

a) 6                        b) 11                c) 2                  d)  1                         e) 3 

13. Segment display “g” is controlled by pin # ____________________

a) 6                        b) 11                c) 2                  d)    1                       e) 3

14. The segment that displays “a decimal point (dp)” is controlled by pin # __________

a) 6                        b) 11                c) 2                  d)  4                      e) 3

15. The microchip most commonly used in timer applications is a_______

a) 665                    b) 555              c) 74LS47      d) 74LS42              e) 74LS08

16. Hexadecimal numbers are said to be numbers to BASE______

a) 10                      b) 16                c) 2                  d) Zeros and Ones

17. The microchip most commonly used in binary to base 10 decoder is a_______

a) 665                    b) 555              c) 74LS47      d) 74LS42              e) 74LS08

18. In a binary to base 10 decoder, the highest decimal number that can be displayed is

a) 10                      b) 9                  c) 0                  d) 1

19. Unusual shapes occur in the display in a binary to base 10 decoder when

a)      The minimum single display has been exceeded

b)      The minimum display voltage has been exceeded

c)      The maximum single display has been exceeded

d)      The value of VCC is not 5 Volts

e)      Pin # 1 is grounded on the decoder

  20. When pin # 4 is connected to ground in a binary to base 10 decoder,
a) all segments turn off  b) all segments turn on
c) nothing happens                 d) a number 9 is displayed

  21. The “blanking input” in a   binary to base 10 decoder is pin #________

a) 6                  b) 11                c) 2                  d) 4                        e) 3

22. When pin # 3 is connected to ground in a binary to base 10 decoder,
a) all segments turn off  b) all segments turn on
c) nothing happens                 d) a number 9 is displayed

  23. The “test—all on” pin  in a   binary to base 10 decoder is pin #________

a) 6                  b) 11                c) 2                  d) 4                        e) 3

  24.  In a typical timer circuit _________________ is/are used for the timing circuit

a) one resistor               b) two resistors    c) one resistor & one capacitor

d) two resistors and one capacitor         e) a clock

  Use the following circuit to answer questions 25 to 33

  25.      The Pin marked with the letter F is the

      a) VCC  +5 volts terminal

      b) Ground

      c) Output

      d) Capacitor

26.      The Pin marked with the letter L is the

  a) VCC  +5 volts terminal       b) Ground      c) Output      d) Capacitor

  27.      The Pin marked with the letter M is the

  a) VCC  +5 volts terminal       b) Ground      c) Output      d) Capacitor

  28.      The Pin marked with the letter B is the

  a) VCC  +5 volts terminal       b) Ground      c) Output      d) Capacitor

  29.      The Pin marked with the letter G is Pin # _____

  a) 7       b) 2      c) 3     d) 4          e) 6

  30.      The Pin marked with the letter H is Pin # ______

  a) 7      b) 2      c) 3     d) 4           e) 6

  31.      The Pin marked with the letter D is Pin # ______

  a) 7       b) 2      c) 3     d) 4          e) 6

32.      The resistor connected between pins___________ tells us how fast the clock is

a) D AND H          b) D AND C                 c) H AND G               d) C AND A  

  33.      The resistor connected between pins___________ has a constant resistance value

a) D AND H          b) D AND C                 c) H AND G               d) C AND A  

  34.      The constant resistor has a typical resistance value of ________ ohms

a) 2                        b) 2000                         c) 20               d) 200

  35.      Computers require decoder chips to

a)      Translate between the base 2 number system and the base 10 number system

b)       Translate between the base 10 number system and the base 2 number system

c)      Translate between the base 2 number system and the base 16 number system

d)      Translate between the base 16 number system and the base 2 number system

SOLUTIONS