logic and computer design quiz 1

 Question 1
Convert Binary (10111001010110.0111)2 to Octal.
Answer
Selected Answer: 27126.34
Correct Answer: 27126.34
Answer range +/- 0.00 (27126.34 - 27126.34)



 Question 2
In BCD Addition, if the sum is greater than 1001, we add ____ to obtain the correct BCD digit sum and carry.
Answer
Selected Answer: d. 0110
Correct Answer: d. 0110



 Question 3

Choose the correct output of a three-state buffer given the following inputs.
Note: in case if you see 2 images discard one.
Answer
Question Correct Match Selected Match
AB = 11 b. 1 b. 1
AB = 10 a. Hi-Z c. 0
AB = 01 c. 0 b. 1
AB = 00 a. Hi-Z a. Hi-Z




Question 4

Find the complement of the following expression:
A(~B)C+(~A)B
Note: ~ denotes NOT.
Answer
Selected Answer: a. (~A+B+~C)(A+~B)
Correct Answer: a. (~A+B+~C)(A+~B)



Question 5
0 out of 5 points
The dual of the expression is obtained by :
Answer
Selected Answers: a. interchanging OR and AND operations and replacing 1s by 0s and 0s by 1s.
d. replacing 1s by 0s and 0s by 1s

Correct Answers: a. interchanging OR and AND operations and replacing 1s by 0s and 0s by 1s.
d. replacing 1s by 0s and 0s by 1s




Question 6
5 out of 5 points
Multiply Binary 101 X 010. Answer in binary.
Answer
Selected Answer: 1010
Correct Answer: 1010



Question 7
5 out of 5 points
How many bits are required to represent decimal 187 as an unsigned integer.
Answer
Selected Answer: b. 8
Correct Answer: b. 8



Question 8
5 out of 5 points
Determine the radix r in the following equation:
(765) r = (1893) 10
Answer
Selected Answer: 16
Correct Answer: 16



Question 9
5 out of 5 points
What is the gate input cost of the following function (assume complemented and uncomplemented literals are available):
F = (AB) + (CD~E) + (~A~B~C)
Answer
Selected Answer: 11
Correct Answer: 11
Answer range +/- 0 (11 - 11)



Question 10
5 out of 5 points
Simplify: AC+(~A)C+B(~C)+(~B)(~C)
Answer
Selected Answer: 1
Correct Answer: 1
Answer range +/- 0 (1 - 1)



Question 11
5 out of 5 points
The following truth table is that of which logic-gate type.
A B F
0 0 1
0 1 1
1 0 1
1 1 0
Answer
Selected Answer: NAND
Correct Answer: NAND



Question 12
5 out of 5 points
What is the standard form of the following function:
F = AB + ~B~C
Note: ~ denotes NOT
Answer
Selected Answer: d. ~A~B~C+A~B~C+AB~C+ABC
Correct Answer: d. ~A~B~C+A~B~C+AB~C+ABC



Question 13
5 out of 5 points
What is the result of Binary addition:
101001
+ 1101111
Answer
Selected Answer: 10011000
Correct Answer: 10011000
Answer range +/- 0 (10011000 - 10011000)



Question 14
5 out of 5 points
An Inverter
Answer
Selected Answer: d. All of them
Correct Answer: d. All of them



Question 15
5 out of 5 points
Optimize the following Boolean function F by using a three-variable K-map:
X Y Z F
0 0 0 1
0 0 1 0
0 1 0 1
0 1 1 0
1 0 0 1
1 0 1 0
1 1 0 1
1 1 1 0
Answer
Selected Answer: c. ~Z
Correct Answer: c. ~Z



Question 16
5 out of 5 points
Given the following function F and don't care conditions, what's the simplification form of F F (A,B,C,D) = Σm(1, 3, 7, 11, 15) d(A,B,C,D) = Σm(0, 5)
Answer
Selected Answer: a. ~AD + CD
Correct Answer: a. ~AD + CD



Question 17
5 out of 5 points
How many error bits could there be in the following data with even parity?
data: 1010
parity: 0
Answer
Selected Answers: b. 4
d. 2
e. 0

Correct Answers: b. 4
d. 2
e. 0




Question 18
5 out of 5 points
How many entries are there in a truth table of 5 variables?
Answer
Selected Answer: 32
Correct Answer: 32



Question 19
5 out of 5 points
The function E(x,y,z) = Σm(1, 2, 4, 5). What are the minterms of complement of E?
Answer
Selected Answer: Σm(0, 3, 6, 7)
Correct Answer: Σm(0, 3, 6, 7)



Question 20
5 out of 5 points
Convert Binary 1101001.011 to Decimal.
Answer
Selected Answer: 105.375
Correct Answer: 105.375
Answer range +/- 0.000 (105.375 - 105.375)




Sunday, December 16, 2012 12:21:37 PM CST