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ENGR3520HomeworkChapter6

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
The Boolean equation for the exclusive-OR function is
a.
X = mc001-1.jpgB + Amc001-2.jpg.
c.
X = mc001-5.jpg mc001-6.jpg + AB.
b.
X = mc001-3.jpgB + mc001-4.jpg.
d.
X = mc001-7.jpg + AB.
 

 2. 
When the inputs to an exclusive-OR gate are the same logic level, the output is
a.
zero.
c.
one.
b.
HIGH.
d.
cannot tell
 

 3. 
During which time interval(s) will output X of this XOR timing diagram be LOW?
mc003-1.jpg
a.
time interval 1
c.
time intervals 3 and 4
b.
time interval 2
d.
time intervals 4 and 5
 

 4. 
During which time interval(s) will output X of this XOR timing diagram be HIGH?
mc004-1.jpg
a.
time intervals 1, 3, and 5
c.
time intervals 2 and 4
b.
time intervals 1, 4, and 5
d.
time interval 3
 

 5. 
What is the correct set of output values for this XOR truth table?

      A      B      X
      0      0     
      0      1
      1      0
      1      1
a.
X =      0
      1
      1
      1
b.
X =      0
      0
      0
      1
c.
X =      0
      1
      1
      0
d.
X =      0
      0
      1
      1
 

 6. 
The Boolean equation for the exclusive-NOR function is
a.
X = A + B + mc006-1.jpg + mc006-2.jpg.
c.
X = AB + mc006-4.jpg mc006-5.jpg.
b.
X = mc006-3.jpg.
d.
X = AB + mc006-6.jpg.
 

 7. 
During which time interval(s) will output X of this XNOR timing diagram be LOW?
mc007-1.jpg
a.
time intervals 1, 2, 4, 5
c.
time interval 1
b.
time intervals 1 and 5
d.
time interval 3
 

 8. 
What is the correct output for this XNOR truth table?

      A      B      X
      0      0
      0      1
      1      0
      1      1
a.
X =      1
      1
      1
      0
b.
X =      0
      1
      1
      0
c.
X =      1
      0
      0
      1
d.
X =      0
      1
      1
      1
 

 9. 
Which of these circuits requires use of an exclusive-OR or an exclusive-NOR gate?
a.
parity checker
c.
comparator
b.
parity generator
d.
all of the above
 

 10. 
In an odd-parity system, the parity bit is one
a.
when there is an odd number of data bits.
b.
when there is an odd number of one bits in the data.
c.
when there is an even number of one bits in the data.
d.
when there is an even number of one bits in the data and when there is an odd number of data bits.
 

 11. 
In an even-parity system, which of the following will generate a HIGH (1) parity bit?
a.
1000011
c.
1111011
b.
0000011
d.
1010011
 

 12. 
In an even-parity system, which of the following will generate a LOW (0) parity bit?
a.
1110101
c.
1000110
b.
1011011
d.
0000101
 

 13. 
In an odd-parity system, which of the following will generate a LOW (0) parity bit?
a.
1000001
c.
0001101
b.
1110001
d.
all of the above
 

 14. 
In an odd-parity system, which of the following will generate a HIGH (1) parity bit?
a.
1100000
c.
1010011
b.
1111000
d.
all of the above
 

 15. 
An even-parity checker indicates a parity error for which received data and parity bit?
a.
data = 1111101
parity = 0
b.
data = 0001100
parity = 0
c.
data = 1000011
parity = 1
d.
data = 1100000
parity = 1
 

 16. 
An odd-parity checker would indicate no parity error for which received data and parity bit?
a.
data = 1111110
parity = 0
b.
data = 1011100
parity = 0
c.
data = 0000000
parity = 1
d.
data = 1111111
parity = 1
 

 17. 
Which data and parity bit combination is correct for an EVEN parity data transmission system?
a.
data = 1010 1111
parity = 1
b.
data = 0011 0111
parity = 0
c.
data = 1001 0000
parity = 1
d.
data = 1110 0110
parity = 1
 

 18. 
Which data and parity bit combination is correct for an ODD parity data transmission system?
a.
data = 1101 0101
parity = 1
b.
data = 0000 0001
parity = 0
c.
data = 0000 0011
parity = 0
d.
data = 0001 0000
parity = 1
 

 19. 
Which data and parity bit combination is correct for an ODD parity data transmission system?
a.
data = 0110 1110
parity = 0
b.
data = 1110 0111
parity = 0
c.
data = 0010 1111
parity = 1
d.
data = 0010 0110
parity = 1
 

 20. 
An exclusive-OR gate will invert a signal on one input if the other input is
a.
always HIGH.
c.
grounded.
b.
connected to the same signal.
d.
inverted.
 

 21. 
A HIGH output if one or the other inputs is HIGH, but not both; describes a(n) ________ gate.
a.
XNOR
c.
OR
b.
XOR
d.
AND
 

 22. 
How many XNOR gates does it take to make a 4 bit binary comparator?
a.
2
c.
8
b.
4
d.
16
 

 23. 
In an even-parity system, which of the following will generate a HIGH (1) parity bit?
a.
1000110
c.
1011001
b.
1000100
d.
1111011
 

 24. 
If the same signal is connected to both inputs of an XOR gate, the output is
a.
undetermined.
c.
HIGH.
b.
LOW.
d.
a clock waveform.
 



 
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