Digital logic circuits multiple choice questions

Digital logic circuit mcq

1. DLC MCQ

2. 1. The difference between a PLA and a PAL is: A. The PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane . B. The PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane . C. The PAL has more possible product terms than the PLA . D. PALs and PLAs are the same thing.

3. 2. SPLDs , CPLDs, and FPGAs are all which type of device? A. PAL B. PLD C. EPROM D. SRAM

4. 3. A(n ) ________ is a section of embedded logic that is commonly found in FPGAs. A. LUT B. core C. DSP D. PI

5. 4. Field-programmable gate arrays (FGPAs) use ________ memory technology, which is ________. A. DRAM, nonvolatile B. SRAM , nonvolatile C. SRAM , volatile D. RAM , volatile

6. 5.  Volatile memory refers to __________ a) The memory whose loosed data is achieved again when power to the memory circuit is removed b) The memory which looses data when power to the memory circuit is removed c) The memory which looses data when power to the memory circuit is applied d) The memory whose loosed data is achieved again when power to the memory circuit is applied View Answer

7. 6. The example of non-volatile memory device is __________ a) Magnetic Core Memory b) Read Only Memory c) Random Access Memory d) Both Magnetic Core Memory and Read Only Memory

8. 7. In CPLD, programmable logic devices and switches are used to generate logic combinations for the involved variables. a. True b. False

9. 8 . How many 16K * 4 RAMs are required to achieve a memory with a capacity of 64K and a word length of 8 bits? a) 2 b) 4 c) 6 d) 8 Explanation: 16K * 4 = 64K RAM is of 64K. Therefore, for a word of length 8-bits, 64 * 8 = 512K RAM required. Thus, number of 16K * 4 RAMs = 512/64 = 8.

10. 9. Why antifuses are used in PLDS a)To protect from high voltages b)To increase the memory c) To implement the programmes d) As a switches

11. 10. How to make a circuit free from Static 1 Hazard? a. Covering with common sum term in the Boolean Expression b. Covering with common product term in the Boolean Expression c. By adding appropriate delay d. Both a & c e. Both b & c

12. 11. What kind of hazard occurs in the expression Y=YZ+XZ’ a)static 0 hazard b)static 1 hazard c)dynamic hazard D) none of these