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Digital Electronics - Combinational Logic Circuits

Exercise

"In the middle of difficulty lies opportunity."
- Albert Einstein
1. 

For the XNOR gate truth table shown below, the values for w, x, y, and z are ____, ____, ____, and ____, respectively.
A. 1, 0, 0, 1
B. 0, 1, 0, 1
C. 1, 1, 1, 0
D. 1, 0, 0, 0
2. 

A half-adder does not have ________.
A. carry in
B. carry out
C. two inputs
D. all of the above
3. 

The equation ________ cannot be further simplified.
A.
B.
C.
D.
4. 

________ is a correct combination for an ODD-parity data transmission system.
A. data = 1101 1011
parity = 1
B. data = 1101 0010
parity = 0
C. data = 0001 0101
parity = 1
D. data = 1010 1111
parity = 0
5. 

A circuit that can convert one of ten numerical keys pressed on a keyboard to BCD is a ________.
A. priority encoder
B. decoder
C. multiplexer
D. demultiplexer

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