Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)
In binary addition, 1 + 1 = ________.
1)
A)
0 with a carry of 1
B)
0 with a carry of 0
C)
1 with a carry of 1
D)
1 with a carry of 0
2)
Convert 11001010001101012 to hexadecimal.
2)
A)
CA35
B)
530121
C)
53AC1
D)
121035
3)
When performing binary addition using the 2’s complement method, an overflow can occur if
________.
3)
A)
both numbers have the same sign
B)
one number is negative and the other is positive
C)
both numbers have the same magnitude
D)
the second number is much greater than the first
4)
The greatest single–digit value in the octal number system equals ________.
4)
A)
9
B)
8
C)
1
D)
7
5)
In binary multiplication, 11 × 110 =________.
5)
A)
10010
B)
11111
C)
11001
D)
10110
1
6)
When performing binary addition using the 2’s complement method, an overflow is indicated by
a(n) ________.
6)
A)
incorrect polarity
B)
incorrect sign bit
C)
incorrect sum
D)
negative sign
7)
Convert decimal 59.72 to BCD.
7)
A)
1110.11
B)
111011
C)
01011001.01110010
D)
0101100101110010
C
8)
Which of the following is the most widely used code for computer input and output?
8)
A)
parity
B)
Gray
C)
EBCDIC
D)
ASCII
D
9)
Which of the following is an invalid BCD code?
9)
A)
1001
B)
0101
C)
0011
D)
1101
D
10)
In binary systems the sign of a number is indicated by ________.
10)
A)
placing a negative sign in front of the number
B)
inverting the bits if the number is negative
C)
using a 0 (zero) bit in front of negative numbers
D)
including a sign bit along with the magnitude bits
D
2
B
11)
In binary subtraction, 1 – 0 = ________.
11)
A)
0 with a borrow 0
B)
0 with a borrow of 1
C)
1 with a borrow of 1
D)
1 with a borrow of 0
12)
In binary addition, 10 + 11 = ________.
12)
A)
11
B)
111
C)
21
D)
101
13)
What is the BCD form of 735 in even parity?
13)
A)
0101001101110
B)
1010100110111
C)
0111001101011
D)
0011100110101
14)
What is the BCD form of 438 in odd parity?
14)
A)
1000001101000
B)
0100000110100
C)
1010000111000
D)
0100001110001
15)
In binary subtraction, 1 – 1 = ________.
15)
A)
1 with a borrow of 0
B)
1 with a borrow of 1
C)
0 with a borrow of 1
D)
0 with a borrow 0
16)
Which of the following is not a standard digital code?
16)
A)
ARRL
B)
Gray
C)
ASCII
D)
BCD
3
17)
In binary multiplication, 11 × 11 =________.
17)
A)
11
B)
1111
C)
110
D)
1001
18)
How many binary digits are required to count to decimal 100?
18)
A)
100
B)
7
C)
3
D)
2
B
19)
Which of the following is based on the division of two binary numbers?
19)
A)
ASCII decoding
B)
Hamming code conversion
C)
The cyclic redundancy check (CRC)
D)
Gray code to decimal conversion
C
20)
The 1’s complement of binary 101010 is ________.
20)
A)
101011
B)
010110
C)
110111
D)
010101
D
21)
The highest decimal value that can be represented by a 4–bit binary number is ________.
21)
A)
7
B)
15
C)
8
D)
32
B
22)
In binary multiplication, 1 × 1 =________.
22)
A)
1 with a carry of 1
B)
0
C)
1
D)
0 with a carry of 1
C
4
D
23)
The highest–value single–digit value in the decimal number system is ________.
23)
A)
10
B)
9
C)
D)
1
24)
Perform the following binary subtraction:
1100 – 0111 = ________.
24)
A)
101
B)
110
C)
11110
D)
010
25)
In binary addition, 1 + 0 = ________.
25)
A)
0 with a carry of 1
B)
1 with a carry of 0
C)
0 with a carry of 0
D)
1 with a carry of 1
26)
In binary division, 1001 ÷ 11 =________.
26)
A)
01
B)
11
C)
00
D)
None of these
27)
Decimal 42 is equivalent to binary ________.
27)
A)
52
B)
101010
C)
01000010
D)
2A
28)
Convert 8B3F16 to binary.
28)
A)
35647
B)
1000101100111111
C)
011010
D)
1011001111100011
5
29)
In binary multiplication, 1 × 0 =________.
29)
A)
1 with a carry of 0
B)
1
C)
0
D)
0 with a carry of 1
30)
In the decimal value 4256, the weight of the numeral 2 is ________.
30)
A)
200
B)
10 ×22
C)
103
D)
102
D
31)
Which of the following statements accurately describes the Gray code?
31)
A)
It is used primarily for shaft position encoding.
B)
It is not an arithmetic code.
C)
It exhibits only a single–bit change from one value to the next.
D)
All of these statements accurately describe the Gray code.
D
32)
In binary addition, 0111 + 0001 = ________.
32)
A)
1110
B)
1000
C)
111
D)
1001
B
33)
In binary subtraction, 100 – 001 = ________.
33)
A)
11
B)
00
C)
10
D)
1001
A
6
C
34)
All digital systems which perform arithmetic operations must indicate ________ and ________ for
numbers.
34)
A)
sign, base
B)
magnitude, base
C)
size, base
D)
sign, magnitude
35)
Perform the following binary subtraction:
11011 – 111 = ________.
35)
A)
10111101
B)
10100
C)
100010
D)
0011
36)
Perform the following binary subtraction:
101 – 11 = ________.
36)
A)
010
B)
110
C)
111
D)
001
37)
The Hamming code is a(n) ________.
37)
A)
encryption code
B)
octal version of the BCD code
C)
an updated version of the ASCII code
D)
error correction code
38)
In the decimal value 42.56, the weight of the numeral 6 is ________.
38)
A)
10–2
B)
10–1
C)
0.06
D)
6 ×2–2
7
39)
What decimal number does 25 represent?
39)
A)
32
B)
10
C)
31
D)
25
40)
The highest single–digit value in the hexadecimal number system equals ________.
40)
A)
4
B)
8
C)
15
D)
0
41)
The cyclic redundancy check is used to detect ________.
41)
A)
one–bit and two–bit parity errors
B)
information that is repeated
C)
one–bit and two–bit data transmission errors
D)
operation cycles that are performed more than once
42)
The 2’s complement of binary 110110 is ________.
42)
A)
101010
B)
001010
C)
110100
D)
001001
43)
In binary division, 1000 ÷ 0100 =________.
43)
A)
0100
B)
0001
C)
0010
D)
None of these
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
44)
The binary number system is fundamental to all digital computers.
44)
8
Explanation:
45)
The decimal value of binary 1011 can be determined by solving the following expression:
1 ×23+0 ×22+1 ×21+1 ×20.
45)
46)
Repeated division–by–10 can be used to convert decimal numbers to binary numbers.
46)
47)
The 1′s complement of binary 10111 is 01000.
47)
48)
The decimal number system consists of the symbols 0–10.
48)
49)
The binary number system consists of the symbols 0 and 1.
49)
50)
The ASCII and Gray codes serve very similar purposes.
50)
9
Answer Key
Testname: C2