set-2

51. The binary code of (73)10 is

1. 1010001

2. 1100101

3. 1000100

4. 1001001

Show me the answer

Answer: 4. 1001001

Explanation:

• The binary representation of the decimal number 73 is 1001001.

• Therefore, the correct answer is 1001001.

52. An AND gate will function as OR if

1. All the inputs to the gates are "1"

2. All the inputs are "0"

3. Either of the inputs is "1"

4. All the inputs and outputs are complemented

Show me the answer

Answer: 4. All the inputs and outputs are complemented

Explanation:

• An AND gate will function as an OR gate if all inputs and outputs are complemented.

• Therefore, the correct answer is All the inputs and outputs are complemented.

53. An OR gate has 6 inputs. How many input words are in its truth table?

1. 64

2. 16

3. 32

4. 128

Show me the answer

Answer: 1. 64

Explanation:

• For an OR gate with 6 inputs, the number of input words in its truth table is: $2^6 = 64$

• Therefore, the correct answer is 64.

54. An OR gate has 6 inputs. What is the only input word that produces a 0 input?

1. 000000

2. 111000

3. 000111

4. 111111

Show me the answer

Answer: 1. 000000

Explanation:

• The only input word that produces a 0 output for an OR gate with 6 inputs is 000000.

• Therefore, the correct answer is 000000.

55. An AND gate has 7 inputs. How many input word are in its truth?

1. 64

2. 16

3. 32

4. 128

Show me the answer

Answer: 4. 128

Explanation:

• For an AND gate with 7 inputs, the number of input words in its truth table is: $2^7 = 128$

• Therefore, the correct answer is 128.

56. An AND gate has 7 inputs, what is the only input word that produces a 1 output?

1. 0000000

2. 1110000

3. 0001111

4. 1111111

Show me the answer

Answer: 4. 1111111

Explanation:

• The only input word that produces a 1 output for an AND gate with 7 inputs is 1111111.

• Therefore, the correct answer is 1111111.

57. A NOR gate has or more input signals. All inputs must be … to get a high output

1. Low

2. Some low some high

3. High

4. 1's

Show me the answer

Answer: 1. Low

Explanation:

• For a NOR gate, all inputs must be LOW to get a HIGH output.

• Therefore, the correct answer is Low.

58. A NOR gate recognizes only the input word whose bits are…

1. 0's and 1's

2. 0's

3. 1's

4. 0's or 1's

Show me the answer

Answer: 2. 0's

Explanation:

• A NOR gate recognizes only the input word whose bits are 0's.

• Therefore, the correct answer is 0's.

59. The NOR gate is logically equivalent to an OR gate followed by an …

1. AND

2. XOR

3. XAND

4. Inverter

Show me the answer

Answer: 4. Inverter

Explanation:

• A NOR gate is logically equivalent to an OR gate followed by an inverter.

• Therefore, the correct answer is Inverter.

60. De Morgan's first theorem says that a NOR gate is equivalent to a bubbled … gate

1. AND

2. XOR

3. XAND

4. NOR

Show me the answer

Answer: 1. AND

Explanation:

• De Morgan's first theorem states that a NOR gate is equivalent to a bubbled AND gate.

• Therefore, the correct answer is AND.

61. A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be…to get a low output

1. Low

2. Some low and some high

3. High

4. 0's

Show me the answer

Answer: 3. High

Explanation:

• For a NAND gate, all inputs must be HIGH to get a LOW output.

• Therefore, the correct answer is High.

62. De Morgan's second theorem says that NAND gate is equivalent to a bubbled ……gate

1. AND

2. XOR

3. XAND

4. OR

Show me the answer

Answer: 4. OR

Explanation:

• De Morgan's second theorem states that a NAND gate is equivalent to a bubbled OR gate.

• Therefore, the correct answer is OR.

63. An XOR gate recognizes only words with an ……number of 1's

1. Even

2. Different

3. Odd

4. All of the above

Show me the answer

Answer: 3. Odd

Explanation:

• An XOR gate recognizes only words with an odd number of 1's.

• Therefore, the correct answer is Odd.

64. The 2-input XOR gate has a high output only when the input bits are…

1. Even

2. Low

3. Different

4. High

Show me the answer

Answer: 3. Different

Explanation:

• A 2-input XOR gate has a HIGH output only when the input bits are different.

• Therefore, the correct answer is Different.

65. The XOR gates are ideal for testing parity because even-parity words produce a …. Output and odd-parity words produce a ……output

1. Low, high

2. Odd, even

3. High, low

4. Even, odd

Show me the answer

Answer: 1. Low, high

Explanation:

• XOR gates are ideal for testing parity because even-parity words produce a LOW output and odd-parity words produce a HIGH output.

• Therefore, the correct answer is Low, high.

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

1. Odd, even

2. Low, high

3. High, low

4. Even, odd

Show me the answer

Answer: 1. Odd, even

Explanation:

• An odd-parity generator produces an odd-parity bit, and an XOR gate can test each received word for parity, rejecting words with even parity.

• Therefore, the correct answer is Odd, even.

67. The EXCLUSIVE-NOR gate is equivalent to an ……gate followed by an inverter

1. OR

2. NAND

3. AND

4. XOR

Show me the answer

Answer: 4. XOR

Explanation:

• The EXCLUSIVE-NOR gate is equivalent to an XOR gate followed by an inverter.

• Therefore, the correct answer is 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

1. SSI, 75

2. SSI, 1000

3. SSI, 100

4. SSI, 10000

Show me the answer

Answer: 3. SSI, 100

Explanation:

• Small-scale integration (SSI) refers to fewer than 12 gates on the same chip, Medium-scale integration (MSI) refers to 12 to 100 gates, and Large-scale integration (LSI) refers to more than 100 gates.

• Therefore, the correct answer is SSI, 100.

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

1. SSI, MSI

2. SSI, LSI

3. MSI, LSI

4. ECL, DTL

Show me the answer

Answer: 1. SSI, MSI

Explanation:

• Bipolar technology is preferred for SSI and MSI, while MOS technology is better suited for LSI.

• Therefore, the correct answer is SSI, MSI.

70. What is 1's complement of 0000 1111 0010 1101 number?

1. 1111 0000 0010 1101

2. 1111 0000 1101 0010

3. 1111 0000 0010 1101

4. 1111 1100 1010 1100

Show me the answer

Answer: 2. 1111 0000 1101 0010

Explanation:

• The 1's complement of 0000 1111 0010 1101 is obtained by flipping all the bits: $1111 0000 1101 0010$

• Therefore, the correct answer is 1111 0000 1101 0010.

71. .....has become the most widely used bipolar family

1. DTL

2. ECL

3. TTL

4. MOS

Show me the answer

Answer: 3. TTL

Explanation:

• TTL (Transistor-Transistor Logic) has become the most widely used bipolar family.

• Therefore, the correct answer is TTL.

72. .....is the fastest logic family' it's used in high-speed applications

1. DTL

2. ECL

3. TTL

4. MOS

Show me the answer

Answer: 2. ECL

Explanation:

• ECL (Emitter-Coupled Logic) is the fastest logic family and is used in high-speed applications.

• Therefore, the correct answer is ECL.

73. .....dominates the LSI field and ....used extensively where lowest power consumption is necessary

1. NMOS, PMOS

2. NMOS, CMOS

3. PMOS, CMOS

4. MOSFET, PMOS

Show me the answer

Answer: 2. NMOS, CMOS

Explanation:

• NMOS dominates the LSI field, and CMOS is used extensively where the lowest power consumption is necessary.

• Therefore, the correct answer is NMOS, CMOS.

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

1. LSI

2. MOS

3. MSI

4. MOSFET

Show me the answer

Answer: 3. MSI

Explanation:

• The 7400 series contains a variety of SSI and MSI chips.

• Therefore, the correct answer is MSI.

75. Standard TTL has a multiple emitter input transistor and a ..... output

1. Totem-pole

2. Register

3. Bipolar

4. Transistor

Show me the answer

Answer: 1. Totem-pole

Explanation:

• Standard TTL has a multiple emitter input transistor and a totem-pole output.

• Therefore, the correct answer is Totem-pole.

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

1. 80(^\circ)C

2. 100(^\circ)C

3. 70(^\circ)C

4. 90(^\circ)C

Show me the answer

Answer: 3. 70(^\circ)C

Explanation:

• The 7400-series devices are guaranteed to work reliably over a temperature range of 0 to 70(^\circ)C.

• Therefore, the correct answer is 70(^\circ)C.

77. A ... TTL device can sink up to 16 mA and can source up to 400MA

1. Low-power

2. Standard

3. High-power

4. Schottky

Show me the answer

Answer: 2. Standard

Explanation:

• A standard TTL device can sink up to 16 mA and can source up to 400 mA.

• Therefore, the correct answer is Standard.

78. The maximum number of TTL loads that a TTL device can drive reliably over the specified temperature range is

1. Fanout

2. Chip

3. Bipolar

4. Universal logic circuit

Show me the answer

Answer: 1. Fanout

Explanation:

• The maximum number of TTL loads that a TTL device can drive reliably is called its fanout.

• Therefore, the correct answer is Fanout.

79. Digital design often starts by constructing a ..... table?

1. Standard

2. Truth

3. Two-Stage

4. Two-dimensional

Show me the answer

Answer: 2. Truth

Explanation:

• Digital design often starts by constructing a truth table.

• Therefore, the correct answer is Truth.

80. A preliminary guide for comparing the simplicity of logic circuits to count the number of input......leads

1. Wires

2. Transistors

3. Gates

4. Registers

Show me the answer

Answer: 2. Transistors

Explanation:

• A preliminary guide for comparing the simplicity of logic circuits is to count the number of transistors.

• Therefore, the correct answer is Transistors.

81. A bus is a group of .....carrying digitals signals

1. Wires

2. Transistors

3. Gates

4. Registers

Show me the answer

Answer: 1. Wires

Explanation:

• A bus is a group of wires carrying digital signals.

• Therefore, the correct answer is Wires.

82. One way to simplicity the sum-of-products equation is to use Boolean algebra. Another way is the .....map

1. De Morgan

2. Schottky

3. Standard

4. Karnaugh

Show me the answer

Answer: 4. Karnaugh

Explanation:

• The Karnaugh map is another way to simplify the sum-of-products equation.

• Therefore, the correct answer is Karnaugh.

83. What are the fundamental products for inputs words ABCD = 0010, ABCD = 1101 and ABCD = 1110?

1. ABCD, ABCD, ABCD

2. ABCD, ABCD, ABCD

3. ABCD, ABCD, ABCD

4. ABCD, ABCD, ABCD

Show me the answer

Answer: 3. ABCD, ABCD, ABCD

Explanation:

• The fundamental products for the input words 0010, 1101, and 1110 are ABCD, ABCD, and ABCD.

• Therefore, the correct answer is ABCD, ABCD, ABCD.

84. The ALU carries out arithmetic and numbers rather than decimal numbers

1. Decimal

2. Binary

3. Hexadecimal

4. All of the above

Show me the answer

Answer: 2. Binary

Explanation:

• The ALU (Arithmetic Logic Unit) carries out arithmetic on binary numbers rather than decimal numbers.

• Therefore, the correct answer is Binary.

85. A half-adder adds....bits

1. 16

2. 19

3. 8

4. 2

Show me the answer

Answer: 4. 2

Explanation:

• A half-adder adds 2 bits.

• Therefore, the correct answer is 2.

86. A full-adder adds ....bits and producing a SUM and a....

1. 8, SUBTRACTION

2. 16,DIVIDE

3. 3, CARRY

4. All of the above

Show me the answer

Answer: 3. 3, CARRY

Explanation:

• A full-adder adds 3 bits and produces a SUM and a CARRY.

• Therefore, the correct answer is 3, CARRY.

87. A binary adder is a logic circuit that can add.....binary numbers at a time

1. Hundreds

2. One

3. Thousands

4. Two

Show me the answer

Answer: 4. Two

Explanation:

• A binary adder can add two binary numbers at a time.

• Therefore, the correct answer is Two.

88. The leading bit stands for the ...and the remaining bits for the ..., is known as signed binary numbers

1. Sign, remainder

2. Value, sign

3. Sign, magnitude

4. Variable, value

Show me the answer

Answer: 3. Sign, magnitude

Explanation:

• In signed binary numbers, the leading bit stands for the sign, and the remaining bits stand for the magnitude.

• Therefore, the correct answer is Sign, magnitude.

89. Signed binary numbers requires too much hardware. This has led to the use of ... complements to represent negative numbers

1. 1's

2. 3's

3. 2's

4. No

Show me the answer

Answer: 3. 2's

Explanation:

• 2's complement is used to represent negative numbers in signed binary numbers to reduce hardware requirements.

• Therefore, the correct answer is 2's.

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

1. Hexa, sign

2. Positive, negative

3. Sign, hexa

4. Negative, positive

Show me the answer

Answer: 2. Positive, negative

Explanation:

• Sign-magnitude numbers represent positive decimal numbers, and 2's complement represents negative decimal numbers.

• Therefore, the correct answer is Positive, negative.

91. How many full and half-adders are required to add 16-bit numbers?

1. 8 half-adders, 8 full-adders

2. 16 half-adders, no full-adders

3. Half-adders, 15 full-adders

4. Half-adders, 12 full-address

Show me the answer

Answer: 3. Half-adders, 15 full-adders

Explanation:

• To add 16-bit numbers, you need 1 half-adder and 15 full-adders.

• Therefore, the correct answer is Half-adders, 15 full-adders.

92. Express-7 as 16-bits signed binary numbers

1. 0000 0000 0000 0111

2. 0111 0000 0000 0000

3. 1000 0000 0000 0111

4. 0111 0000 0000 0000

Show me the answer

Answer: 3. 1000 0000 0000 0111

Explanation:

• The 16-bit signed binary representation of -7 is 1000 0000 0000 0111.

• Therefore, the correct answer is 1000 0000 0000 0111.

93. Convert the 1000 0000 0000 1111 signed binary number to decimal number

1. +15

2. -30

3. -15

4. +30

Show me the answer

Answer: 3. -15

Explanation:

• The signed binary number 1000 0000 0000 1111 represents -15 in decimal.

• Therefore, the correct answer is -15.

94. What is the 2's complement of 0011 0101 1001 1100 number?

1. -1100 1001 1100 1011

2. 1100 1010 0110 0100

3. 1100 1010 0110 0011

4. 1100 1010 1111 1111

Show me the answer

Answer: 2. 1100 1010 0110 0100

Explanation:

• The 2's complement of 0011 0101 1001 1100 is 1100 1010 0110 0100.

• Therefore, the correct answer is 1100 1010 0110 0100.

95. What is the 2's-complement presentation of -24 in a 16-bit microcomputer?

1. 0000 0000 0001 1000

2. 1111 1111 1110 1000

3. 1111 1111 1110 0111

4. 0001 0001 1111 0011

Show me the answer

Answer: 2. 1111 1111 1110 1000

Explanation:

• The 2's complement representation of -24 in a 16-bit microcomputer is 1111 1111 1110 1000.

• Therefore, the correct answer is 1111 1111 1110 1000.

96. A flip-flop is a ...element that stores a binary digit as a low or high voltage

1. Chip

2. I/O

3. Bus

4. Memory

Show me the answer

Answer: 4. Memory

Explanation:

• A flip-flop is a memory element that stores a binary digit as a low or high voltage.

• Therefore, the correct answer is 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

1. No change, set

2. High, reset

3. Race, high

4. Set. Reset

Show me the answer

Answer: 2. High, reset

Explanation:

• In an RS latch, a high S and low R sets the output to HIGH, and a low S and high R resets the output to LOW.

• Therefore, the correct answer is High, reset.

98. With a NAND latch a low R and a low S produce a:.....condition

1. Race

2. Reset

3. Set

4. No change

Show me the answer

Answer: 1. Race

Explanation:

• In a NAND latch, a low R and low S produce a race condition.

• Therefore, the correct answer is Race.

99. Computers use thousands of flip-flops. To coordinate the overall action, a common signal called the ...is sent to each flip-flop

1. Latch

2. Master

3. Clock

4. Slave

Show me the answer

Answer: 3. Clock

Explanation:

• A clock signal is used to coordinate the overall action of flip-flops in a computer.

• Therefore, the correct answer is Clock.

100. With positive clocking the clock signal must be.....for the flip-flop to respond

1. High

2. Set

3. Low

4. Race

Show me the answer

Answer: 1. High

Explanation:

• With positive clocking, the clock signal must be HIGH for the flip-flop to respond.

• Therefore, the correct answer is High.