| 1. |
Any number with an exponent of zero is equal to: |
| A. | zero |
| B. | one |
| C. | that number |
| D. | ten |
| Answer» B. one | |
| 2. |
In the decimal numbering system, what is the MSD? |
| A. | the middle digit of a stream of numbers |
| B. | the digit to the right of the decimal point |
| C. | the last digit on the right |
| D. | the digit with the most weight |
| Answer» D. the digit with the most weight | |
| 3. |
Which of the following statements does NOT describe an advantage of digital technology? |
| A. | the values may vary over a continuous range. |
| B. | the circuits are less affected by noise. |
| C. | the operation can be programmed. |
| D. | information storage is easy. |
| Answer» A. the values may vary over a continuous range. | |
| 4. |
The generic array logic (GAL) device is ________. |
| A. | one-time programmable |
| B. | reprogrammable |
| C. | a cmos device |
| D. | reprogrammable and a cmos device |
| Answer» B. reprogrammable | |
| 5. |
The range of voltages between VL(max) and VH(min) are ________. |
| A. | unknown |
| B. | unnecessary |
| C. | unacceptable |
| D. | between 2 v and 5 v |
| Answer» C. unacceptable | |
| 6. |
What is a digital-to-analog converter? |
| A. | it takes the digital information from an audio cd and converts it to a usable form. |
| B. | it allows the use of cheaper analog techniques, which are always simpler. |
| C. | it stores digital data on a hard drive. |
| D. | it converts direct current to alternating current. |
| Answer» A. it takes the digital information from an audio cd and converts it to a usable form. | |
| 7. |
What are the symbols used to represent digits in the binary number system? |
| A. | 0,1 |
| B. | 0,1,2 |
| C. | 0 through 8 |
| D. | 1,2 |
| Answer» A. 0,1 | |
| 8. |
A full subtracter circuit requires ________. |
| A. | two inputs and two outputs |
| B. | two inputs and three outputs |
| C. | three inputs and one output |
| D. | three inputs and two outputs |
| Answer» D. three inputs and two outputs | |
| 9. |
The output of an AND gate is LOW ________. |
| A. | all the time |
| B. | when any input is low |
| C. | when any input is high |
| D. | when all inputs are high |
| Answer» B. when any input is low | |
| 10. |
Give the decimal value of binary 10010. |
| A. | 610 |
| B. | 910 |
| C. | 1810 |
| D. | 2010 |
| Answer» C. 1810 | |
| 11. |
Parallel format means that: |
| A. | each digital signal has its own conductor. |
| B. | several digital signals are sent on each conductor. |
| C. | both binary and hexadecimal can be used. |
| D. | no clock is needed. |
| Answer» A. each digital signal has its own conductor. | |
| 12. |
A decoder converts ________. |
| A. | noncoded information into coded form |
| B. | coded information into noncoded form |
| C. | highs to lows |
| D. | lows to highs |
| Answer» B. coded information into noncoded form | |
| 13. |
A DAC changes ________. |
| A. | an analog signal into digital data |
| B. | digital data into an analog signal |
| C. | digital data into an amplified signal |
| D. | none of the above |
| Answer» B. digital data into an analog signal | |
| 14. |
The output of a NOT gate is HIGH when ________. |
| A. | the input is low |
| B. | the input is high |
| C. | the input changes from low to high |
| D. | voltage is removed from the gate |
| Answer» A. the input is low | |
| 15. |
The output of an OR gate is LOW when ________. |
| A. | all inputs are low |
| B. | any input is low |
| C. | any input is high |
| D. | all inputs are high |
| Answer» A. all inputs are low | |
| 16. |
Which of the following is not an analog device? |
| A. | thermocouple |
| B. | current flow in a circuit |
| C. | light switch |
| D. | audio microphone |
| Answer» C. light switch | |
| 17. |
A demultiplexer has ________. |
| A. | one data input and a number of selection inputs, and they have several outputs |
| B. | one input and one output |
| C. | several inputs and several outputs |
| D. | several inputs and one output |
| Answer» A. one data input and a number of selection inputs, and they have several outputs | |
| 18. |
A flip-flop has ________. |
| A. | one stable state |
| B. | no stable states |
| C. | two stable states |
| D. | none of the above |
| Answer» C. two stable states | |
| 19. |
Digital signals transmitted on a single conductor (and a ground) must be transmitted in: |
| A. | slow speed. |
| B. | parallel. |
| C. | analog. |
| D. | serial. |
| Answer» D. serial. | |
| 20. |
In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________. |
| A. | 0% |
| B. | 25% |
| C. | 50% |
| D. | 100% |
| Answer» B. 25% | |
| 21. |
Select the statement that best describes the parity method of error detection: |
| A. | parity checking is best suited for detecting double-bit errors that occur during the transmission of codes from one location to another. |
| B. | parity checking is not suitable for detecting single-bit errors in transmitted codes. |
| C. | parity checking is best suited for detecting single-bit errors in transmitted codes. |
| D. | parity checking is capable of detecting and correcting errors in transmitted codes. |
| Answer» C. parity checking is best suited for detecting single-bit errors in transmitted codes. | |
| 22. |
A logic circuit that provides a HIGH output for both inputs HIGH or both inputs LOW is a(n): |
| A. | ex-nor gate |
| B. | or gate |
| C. | ex-or gate |
| D. | nand gate |
| Answer» A. ex-nor gate | |
| 23. |
A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n): |
| A. | ex-nor gate |
| B. | or gate |
| C. | ex-or gate |
| D. | nand gate |
| Answer» C. ex-or gate | |
| 24. |
Identify the type of gate below from the equation |
| A. | ex-nor gate |
| B. | or gate |
| C. | ex-or gate |
| D. | nand gate |
| Answer» C. ex-or gate | |
| 25. |
Parity systems are defined as either________ or ________ and will add an extra ________ tothe digital information being transmitted. |
| A. | positive, negative, byte |
| B. | odd, even, bit |
| C. | upper, lower, digit |
| D. | on, off, decimal |
| Answer» B. odd, even, bit | |
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