set-2
51. The binary code of (73)10 is
1010001
1100101
1000100
1001001
52. An AND gate will function as OR if
All the inputs to the gates are "1"
All the inputs are "0"
Either of the inputs is "1"
All the inputs and outputs are complemented
53. An OR gate has 6 inputs. How many input words are in its truth table?
64
16
32
128
54. An OR gate has 6 inputs. What is the only input word that produces a 0 input?
000000
111000
000111
111111
55. An AND gate has 7 inputs. How many input word are in its truth?
64
16
32
128
56. An AND gate has 7 inputs, what is the only input word that produces a 1 output?
0000000
1110000
0001111
1111111
57. A NOR gate has or more input signals. All inputs must be … to get a high output
Low
Some low some high
High
1's
58. A NOR gate recognizes only the input word whose bits are…
0's and 1's
0's
1's
0's or 1's
59. The NOR gate is logically equivalent to an OR gate followed by an …
AND
XOR
XAND
Inverter
60. De Morgan's first theorem says that a NOR gate is equivalent to a bubbled … gate
AND
XOR
XAND
NOR
61. A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be…to get a low output
Low
Some low and some high
High
0's
62. De Morgan's second theorem says that NAND gate is equivalent to a bubbled ……gate
AND
XOR
XAND
OR
63. An XOR gate recognizes only words with an ……number of 1's
Even
Different
Odd
All of the above
64. The 2-input XOR gate has a high output only when the input bits are…
Even
Low
Different
High
65. The XOR gates are ideal for testing parity because even-parity words produce a …. Output and odd-parity words produce a ……output
Low, high
Odd, even
High, low
Even, odd
66. An odd-parity generator produces an odd-parity bit to go along with the data. The parity of the transmitted data is ….. An XOR gate can test each received word for parity rejecting words with …. Parity
Odd, even
Low, high
High, low
Even, odd
67. The EXCLUSIVE-NOR gate is equivalent to an ……gate followed by an inverter
OR
NAND
AND
XOR
68. Small-scale integration, abbreviated ….. refers to fewer than 12 gates on the same chip. Medium-scale integration (MSD) means 12 to 100 gates per chip. And large-scale integration (LST) refers to more than ……gates per chip
SSI, 75
SSI, 1000
SSI, 100
SSI, 10000
69. The two basic technologies for digital ICs are bipolar and MOS. Bipolar technology is preferred for ...... and ...... whereas MOS technology is better suited to LSI
SSI, MSI
SSI, LSI
MSI, LSI
ECL, DTL
70. What is 1's complement of 0000 1111 0010 1101 number?
1111 0000 0010 1101
1111 0000 1101 0010
1111 0000 0010 1101
1111 1100 1010 1100
71. .....has become the most widely used bipolar family
DTL
ECL
TTL
MOS
72. .....is the fastest logic family' it's used in high-speed applications
DTL
ECL
TTL
MOS
73. .....dominates the LSI field and ....used extensively where lowest power consumption is necessary
NMOS, PMOS
NMOS, CMOS
PMOS, CMOS
MOSFET, PMOS
74. The 7400 series, also called standard TTL, contains a variety of SSI and ... chips that allow us to build all kinds of digital circuits and systems
LSI
MOS
MSI
MOSFET
75. Standard TTL has a multiple emitter input transistor and a ..... output
Totem-pole
Register
Bipolar
Transistor
76. The 7400-series devices are guaranteed to work reliably over a temperature range of 0 to .... and over a voltage range of 4.75 to 5.25 V
80(^\circ)C
100(^\circ)C
70(^\circ)C
90(^\circ)C
77. A ... TTL device can sink up to 16 mA and can source up to 400MA
Low-power
Standard
High-power
Schottky
78. The maximum number of TTL loads that a TTL device can drive reliably over the specified temperature range is
Fanout
Chip
Bipolar
Universal logic circuit
79. Digital design often starts by constructing a ..... table?
Standard
Truth
Two-Stage
Two-dimensional
80. A preliminary guide for comparing the simplicity of logic circuits to count the number of input......leads
Wires
Transistors
Gates
Registers
81. A bus is a group of .....carrying digitals signals
Wires
Transistors
Gates
Registers
82. One way to simplicity the sum-of-products equation is to use Boolean algebra. Another way is the .....map
De Morgan
Schottky
Standard
Karnaugh
83. What are the fundamental products for inputs words ABCD = 0010, ABCD = 1101 and ABCD = 1110?
ABCD, ABCD, ABCD
ABCD, ABCD, ABCD
ABCD, ABCD, ABCD
ABCD, ABCD, ABCD
84. The ALU carries out arithmetic and numbers rather than decimal numbers
Decimal
Binary
Hexadecimal
All of the above
85. A half-adder adds....bits
16
19
8
2
86. A full-adder adds ....bits and producing a SUM and a....
8, SUBTRACTION
16,DIVIDE
3, CARRY
All of the above
87. A binary adder is a logic circuit that can add.....binary numbers at a time
Hundreds
One
Thousands
Two
88. The leading bit stands for the ...and the remaining bits for the ..., is known as signed binary numbers
Sign, remainder
Value, sign
Sign, magnitude
Variable, value
89. Signed binary numbers requires too much hardware. This has led to the use of ... complements to represent negative numbers
1's
3's
2's
No
90. A 2's-complement adder-subtracter can add or subtract binary numbers. Sign-magnitude numbers represent.....decimal numbers and 2's complements stands for .... Decimal numbers
Hexa, sign
Positive, negative
Sign, hexa
Negative, positive
91. How many full and half-adders are required to add 16-bit numbers?
8 half-adders, 8 full-adders
16 half-adders, no full-adders
Half-adders, 15 full-adders
Half-adders, 12 full-address
92. Express-7 as 16-bits signed binary numbers
0000 0000 0000 0111
0111 0000 0000 0000
1000 0000 0000 0111
0111 0000 0000 0000
93. Convert the 1000 0000 0000 1111 signed binary number to decimal number
+15
-30
-15
+30
94. What is the 2's complement of 0011 0101 1001 1100 number?
-1100 1001 1100 1011
1100 1010 0110 0100
1100 1010 0110 0011
1100 1010 1111 1111
95. What is the 2's-complement presentation of -24 in a 16-bit microcomputer?
0000 0000 0001 1000
1111 1111 1110 1000
1111 1111 1110 0111
0001 0001 1111 0011
96. A flip-flop is a ...element that stores a binary digit as a low or high voltage
Chip
I/O
Bus
Memory
97. With an RS latch a high S and low R sets the output to ...,; a low S and a high R....the output to low
No change, set
High, reset
Race, high
Set. Reset
98. With a NAND latch a low R and a low S produce a:.....condition
Race
Reset
Set
No change
99. Computers use thousands of flip-flops. To coordinate the overall action, a common signal called the ...is sent to each flip-flop
Latch
Master
Clock
Slave
100. With positive clocking the clock signal must be.....for the flip-flop to respond
High
Set
Low
Race
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