S A M P L E
Quiz #10
Name ___________________ Honor Code________________________ Section _____
A. Complete the truth table for the circuit shown below:
/ /
Q R S L / /
-------------------- ---* ---* ---*___----
0 0 0 0 | |
----- | / |
0 0 1 0 | / |
----- ------+---*___---* ---*___----+-------
0 1 0 1 | | | _|_
----- | | / / | / | \
0 1 1 0 ------- | / / | ( @ )
----- --- ---* ---*___---* ---- \_|_/
1 0 0 0 ------- |
----- --- Q R S | L
1 0 1 1 | |
----- | |
1 1 0 1 | |
----- ----------------------------------------
1 1 1 0
-----
B. Give the logical expression for the circuit shown in B. above.
L = Q * R * S' + Q' * R * S' + Q * R' * S
C. The circuit shown is the three bit adder discussed in class (without the
control circuits). Show its use in adding the binary number 010 in the X
register and 011 in the Y register.
SHOW HOW ALL SWITCH AND RELAY CONTACTS WILL BE SET both by entering the
numbers to be added by way of the switch contacts and by the relay magnets
as a result of these actions.
(Show switch contacts that are closed or are left closed with a circle over
them. Leave switch contacts that are opened or are left open, unmarked.
It will be assumed that all switch contacts that you do not circle are open.)
simpadd.gif simpadd.ps