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Question
Which of the following is an invalid state in an 8421 BCD counter?
Options
A. 0011
B. 1001
C. 1000
D. 1100
Correct Answer
1100
More questions
1. The first microprocessor had a(n)________.
Options
A. 1-bit data bus
B. 2-bit data bus
C. 4-bit data bus
D. 8-bit data bus
Show Answer
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Discuss
Correct Answer: 4-bit data bus
2. If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
Options
A. 1
B. 2
C. 7
D. 8
Show Answer
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Discuss
Correct Answer: 7
3. The select inputs to a multiplexer may also be called address lines.
Options
A. True
B. False
Show Answer
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Correct Answer: True
4. How many 2-input NOR gates does it take to produce a 2-input NAND gate?
Options
A. 1
B. 2
C. 3
D. 4
Show Answer
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Discuss
Correct Answer: 4
5. The 7476 and 74LS76 are both dual flip-flops.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
6. How many different states does a 3-bit asynchronous counter have?
Options
A. 2
B. 4
C. 8
D. 16
Show Answer
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Discuss
Correct Answer: 8
7. The invalid range for an input to TTL logic is from ________.
Options
A. 0 to 0.8 V
B. 1.2 to 1.6 V
C. 0.8 to 2.0 V
D. 2.0 to 5.0 V
Show Answer
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Correct Answer: 0.8 to 2.0 V
8. A typical fan-out for most TTL is 9.
Options
A. True
B. False
Show Answer
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Correct Answer: False
9. The outputs of the 74138 octal decoder are enabled when the enable inputs are
.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
10. Convert the following hexadecimal number to decimal.
B5
16
Options
A. 212
B. 197
C. 165
D. 181
Show Answer
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Discuss
Correct Answer: 181
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