# Digital Circuits Questions and Answers – Random Access Memory – 4

This set of Basic Digital Electronic/Circuits Interview questions and answers focuses on “Random Access Memory-4”.

1. DRAM is fabricated by using IC __________
a) 2114
b) 7489
c) 4116
d) 2776

Explanation: DRAM is Dynamic RAM which takes more access time compared to SRAM and is thus, slower in operation comparatively. Although, in general it offers high speed and is used in most computers nowadays. DRAM is fabricated by using IC 4116.

2. IC 4116 is of ______ storage memory.
a) 16 KB
b) 32 KB
c) 64 MB
d) 2 KB

Explanation: IC 4116 is a DRAM of 16 KB storage memory. It requires three supply voltages (+5V, -5V, and +12V) to operate the IC unit.

3. How many supply voltage IC 4116 requires to operate the IC unit?
a) 3
b) 2
c) 1
d) 4

Explanation: IC 4116 is a DRAM of 16 KB storage memory. It requires three supply voltages (+5V, -5V, and +12V) to operate the IC unit.

4. The full form of PSRAM is __________
a) Plugged Static RAM
b) Plugged Stored RAM
c) Pseudo Stored RAM
d) Pseudo Static RAM

Explanation: The full form of PSRAM is Pseudo Static RAM. It is a dynamic RAM which is implemented as a SRAM.

5. Pseudo static RAM is a __________
a) Static RAM
b) Dynamic RAM
c) Cache
d) ROM

Explanation: The full form of PSRAM is Pseudo Static RAM. It is a dynamic RAM having built-in fresh logic, which is implemented as an SRAM.
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6. When PSRAM is performing internal refresh __________
a) The read operation is performed
b) The write operation is performed
c) It can not be accessed for read or write
d) The voltage goes HIGH

Explanation: The full form of PSRAM is Pseudo Static RAM. It is a dynamic RAM having built-in fresh logic, which is implemented as a SRAM. So, it can not be accessed for read or write during the refresh operation.

7. RAMs are utilized in the computer as __________
b) Buffer
c) Main memory
d) All of the Mentioned

Explanation: RAMs are utilized in the computer as a scratch-pad, buffer and main memories. These are the applications of RAMs. Mostly, these RAMs are DRAMs as they provide high speed.

8. The advantages of RAMs are __________
b) Fast operating speed
c) Low power dissipation
d) All of the Mentioned

Explanation: The advantages of RAM are Non-destructive read out, Fast operating speed and Low power dissipation.

9. Which one is more economical?
a) ROM
b) RAM
c) EROM
d) PROM

Explanation: RAM is more economical than ROM because MOS memories are more economical than the magnetic core for small and medium sized systems.

10. Which one is self-compatible?
a) ROM
b) RAM
c) EROM
d) PROM

Explanation: As semiconductor memories enjoy common interface and technology between sensing and decoding circuitry and the storage element itself, so RAMs are self-compatible. Also, they provide high speed and fast operation.

11. The memory which is used for storing programs and data currently being processed by the CPU is called __________
a) PROM
b) Main Memory
c) Non-volatile memory
d) Mass memory

Explanation: PROM has the capability to store the data due to the presence of MOSFET which is processed by the CPU. It is one-time programmable by the user.

12. CD-ROM is a __________
a) Memory register
b) Magnetic memory
c) Semiconductor memory
d) Non-volatile memory

Explanation: CD-ROM is a non-volatile memory. Once a program is uploaded in it then it can’t be erasable. Thus, it stores the data permanently.

13. A place which is used as storage location in a computer __________
a) A bit
b) A record
d) A byte

Explanation: A storage location of a computer is an address/memory location, used to store instructions and data.

14. Which of the following is not a primary storage device?
a) Optical disk
b) Magnetic tape
c) Magnetic disk
d) RAM

Explanation: RAM (i.e. Random Access Memory) is not a primary storage device.

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