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Digital Electronics
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Describing Logic Circuits
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Question
In an expression containing both AND and OR operations, the AND operations are performed first (unless parentheses indicate otherwise).
Options
A. True
B. False
Correct Answer
True
More questions
1. The range of negative numbers when using an eight-bit two's-complement system is ?1 to ?128.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
2. A binary number's value changes most drastically when the ________ is changed.
Options
A. MSB
B. frequency
C. LSB
D. duty cycle
Show Answer
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Discuss
Correct Answer: MSB
3. When the term RAM is used with semiconductor memories, it usually means ________ as opposed to ROM.
Options
A. Random-Access Memory
B. Read/Write Memory (RWM)
C. flash memory
D. temporary storage
Show Answer
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Correct Answer: Read/Write Memory (RWM)
4. The minimum input voltage recognized as HIGH by a TTL gate is ________.
Options
A. 2.0 V
B. 2.4 V
C. 0.8 V
D. 5.0 V
Show Answer
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Correct Answer: 2.0 V
5. Which of the following combinations of logic gates can decode binary 1101?
Options
A. One 4-input AND gate
B. One 4-input AND gate, one OR gate
C. One 4-input NAND gate, one inverter
D. One 4-input AND gate, one inverter
Show Answer
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Correct Answer: One 4-input AND gate, one inverter
6. When data input I
4
of a 74148 octal-to-binary encoder is active, the data output is:
A
0
= 1
A
1
= 1
A
2
= 0
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
7. The half-step sequence of a stepper motor is created by inserting a start with only one coil energized between full steps.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
8. Is the propagation delay from the clock to the output for the 7476 the same as the delay from the set or reset to the output?
Options
A. yes
B. no
Show Answer
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Correct Answer: yes
9. The number of 16k × 4 memories needed to construct a 128k × 8 memory is ________.
Options
A. 4
B. 8
C. 12
D. 16
Show Answer
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Correct Answer: 16
10. Memory devices that use electronic latching circuits are called ________.
Options
A. RAM
B. flip-flops
C. magnetic tape
D. DRAM
Show Answer
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Discuss
Correct Answer: flip-flops
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