Electronics and Communication Engineering - Digital Electronics

16. 

Semiconductor ROM's are sometimes preferred to semiconductor RAM's because

A. ROM's are cheaper than RAMs
B. ROMs are faster
C. ROMs do not require power supply for their operations
D. Programs stored in ROMs cannot be altered either by the power failure or by the user

Answer: Option D

Explanation:

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17. 

RAMs can be built with bipolar or CMOS transistor RAMs that are not possible with bipolar transistors are

A. SRAM
B. SRAM, DRAM
C. DRAM
D. PROM

Answer: Option C

Explanation:

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18. 

RS latch can be built with

A. NOR gates
B. NAND gates
C. NOR or NAND gates
D. none of the above

Answer: Option C

Explanation:

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19. 

In D-type FF, Preset (Pr) and clear (Clr) inputs are called

A. Synchronous
B. Asynchronous
C. Data
D. None

Answer: Option B

Explanation:

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20. 

Which memory is available in all technologies?

A. PROM
B. EEPROM
C. ROM
D. EPROM

Answer: Option A

Explanation:

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