Digital Electronics - Digital Concepts
Digital Electronics - Digital Concepts
21. In positive logic, ________.
- a HIGH = 1, a LOW = 0
- a LOW = 1, a HIGH = 0
- only HIGHs are present
- only LOWs are present
23. Digital representations of numerical values of quantities may BEST be described as having characteristics:
- that are difficult to interpret because they are continuously changing
- that vary constantly over a continuous range of values.
- that vary in constant and direct proportion to the values they represent.
- that vary in discrete steps in proportion to the values they represent.
24. A common instrument used in troubleshooting a digital circuit is a(n) ________.
- logic probe
- oscilloscope
- pulser
- all of the above
25. The parallel transmission of digital data:
- is much slower than the serial transmission of data.
- requires only one signal line between sender and receiver.
- requires as many signal lines between sender and receiver as there are data bits.
- is less expensive than the serial method of data transmission.
26. Convert the fractional decimal number 6.75 to binary.
- 0111.1100
- 0110.1010
- 0110.1100
- 0110.0110
27. What is one relative disadvantage of serial transfer?
- It requires too many conductors.
- Its interconnect system is complex.
- It is slow.
- It can only be used over very short distances.
28. Which format requires fewer conductors?
- Parallel
- Serial
- Both are the same
- Cannot tell
29. A pulse has a period of 15 ms. Its frequency is ________.
- 6.66 Hz
- 66.66 Hz
- 666.66 Hz
- 15 Hz