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Chapter 6: Encoding, Decoding, and Seven-Segment Displays
      
  1.Refer to Fig. 6-1. The BCD input into the 7447 decoder IC is ___ causing the 7-segment LED display to read decimal ___ (the number 8 on the display is not the correct output and only shows that this is a 7-segment display).
 
  a.   1001, 9  
  b.   0011, 3  
  c.   0001, 1  
  d.   0111, 7  
  e.   all of the above are correct  
      
  2.A widely used 7-bit code is the American Code for Information Interchange or ___ code.  
  a.   ASCII  
  b.   Gray  
  c.   Hollerith  
  d.   BCD  
      
  3.Refer to Fig. 6-1. The 7447 IC is a BCD-to-7-segment decoder which can drive LED displays and has active ___ (HIGH, LOW) input with active ___ (HIGH, LOW) outputs.
  
  a.   HIGH, HIGH  
  b.   HIGH, LOW  
  c.   LOW, HIGH  
  d.   LOW, LOW  
      
  4.The decimal number 931 equals ___ in 8421 BCD code.  
  a.   1000 0011 1001  
  b.   1001 1100 1000  
  c.   1001 0011 0001  
  d.   0001 0011 1000  
      
  5.The seven-segment display (without the use of colored filters) that emits a reddish glow is the ___ type.  
  a.   LED (light-emitting diode)  
  b.   LCD (liquid-crystal display)  
  c.   Vacuum fluorescent  
  d.   All of the above  
      
  6.In reference to an operational 74147 TTL encoder IC, if only input 7 is activated with a LOW, active LOW output(s) ___ will be activated.  
  a.   D  
  b.   C and E  
  c.   A, D and E  
  d.   A, B and C  
      
  7.A segment of a LCD display is said to be driven or activated by a(n) ___ square-wave signal.  
  a.   DC  
  b.   In-phase  
  c.   Out-of-phase  
  d.   PCMCIA  
      
  8.A(n) ___ is the electronic circuit used to convert the decimal input of a calculator to the BCD code used by the internal circuits or central processing unit.  
  a.   Flip-flop  
  b.   Multiplexer  
  c.   Assembler  
  d.   Encoder  
      
  9.Portable digital devices, such as watches or solar-powered calculators, use ___ displays because of their extremely low power consumption.  
  a.   Incandescent  
  b.   LCD (liquid-crystal display)  
  c.   LED (light-emitting diode)  
  d.   Vacuum fluorescent  
      
  10.The ___ type display uses older vacuum tube technology.  
  a.   LCD  
  b.   LED  
  c.   VF  
  d.   All of the above  

 

 

 
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