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Home ‣ Digital Electronics ‣ Combinational Logic Circuits See What Others Are Saying!
- Question
As a technician you are confronted with a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips, but the readings are inconclusive because of their erratic nature. Of the possible faults listed, select the one that most probably is causing the problem.
Options- A. A defective IC chip that is drawing excessive current from the power supply
- B. A solar bridge between the inputs on the first IC chip on the board
- C. An open input on the first IC chip on the board
- D. A defective output IC chip that has an internal open to Vcc
- Correct Answer
- An open input on the first IC chip on the board
- 1. How many 2K × 8 ROM chips would be required to build a 16K × 8 memory system?
Options- A. 2
- B. 4
- C. 8
- D. 16 Discuss
- 2. Which of the following memories uses a MOS capacitor as its memory cell?
Options- A. SRAM
- B. DRAM
- C. ROM
- D. FIFO Discuss
- 3. The checksum method is used to test ________.
Options- A. ROM
- B. EEPROM
- C. FPLA
- D. RAM Discuss
- 4. In a register stack, data moves up but not down.
Options- A. True
- B. False Discuss
- 5. The decimal number for octal 748 is ________.
Options- A. 74
- B. 60
- C. 22
- D. 62 Discuss
- 6. What is the resultant binary of the decimal problem 49 + 01 =?
Options- A. 01010101
- B. 00110101
- C. 00110010
- D. 00110001 Discuss
- 7. Data transfer from I/O to external data memory can only be done with the MOVX command.
Options- A. True
- B. False Discuss
- 8. What is the decimal value of 23 ?
Options- A. 2
- B. 4
- C. 6
- D. 8 Discuss
- 9. Which type of ROM can be erased by UV light?
Options- A. ROM
- B. mask ROM
- C. EPROM
- D. EEPROM Discuss
- 10. How many bits are in an ASCII character?
Options- A. 16
- B. 8
- C. 7
- D. 4 Discuss
More questions
Correct Answer: 8
Correct Answer: DRAM
Correct Answer: ROM
Correct Answer: False
Correct Answer: 60
Correct Answer: 00110010
Correct Answer: True
Correct Answer: 8
Explanation:
2
3 = 2*2*2=8
Correct Answer: EPROM
Correct Answer: 7
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