Digital Electronic/Circuits Aptitude Test on “Read Only Memory(ROM)-3”.
1. ROM may be programmed in _____ ways.
A. 2
B. 3
C. 4
D. 5
Answer: A
Clarification: ROM may be programmed in two different ways: (i) Mask Programming & (ii) PROM. Mask Programming is done by the manufacture. Whereas, PROM(Programmable ROM) is programmed by the user.
2. Which programming is done during the manufacturing process?
A. Mask Programming
B. PROM
C. Both PROM and mask programming
D. EPROM
Answer: A
Clarification: Mask ROM is permanently programmed during the manufacturing process. Whereas, PROM(Programmable ROM) is programmed by the user.
3. A photographic negative is called a ____________
A. Photo
B. Negative
C. Mask
D. Virtual image
Answer: C
Clarification: A photographic negative is called a mask is used to control the electrical connections on the chip.
4. Mask programming is also known as __________
A. EPROM
B. PROM
C. Custom programming
D. Both PROM and EPROM
Answer: C
Clarification: Mask programming is also known as custom programming. Mask ROM is permanently programmed during the manufacturing process. Whereas, PROM(Programmable ROM) is programmed by the user.
5. The total storage capacity of 16 * 8 ROM is __________
A. 8 bits
B. 16 bits
C. 128 bits
D. 64 bits
Answer: C
Clarification: ROM stands for Read Only Memory in which data is stored permanently and wherefrom data can only be read and rarely modified. The total storage capacity of 16 * 8 ROM is 128 bits (i.e. 16 * 8 = 128).
6. Which IC is a typical MSI/TTL based?
A. IC 74187
B. IC 74189
C. IC 74188
D. IC 74186
Answer: A
Clarification: MSI/TTL stands for Medium Scale Integration of Transistor-Transistor Logic. IC 74187 is a typical MSI/TTL based.
7. IC 74187 is of __________
A. 512 bits
B. 1024 bits
C. 256 bits
D. 68 bits
Answer: B
Clarification: IC 74187 is of 1024 bits because it is organised as 256 * 4. Thus, it has 256 rows and 4 columns.
8. How many rows and columns are present in IC 74187?
A. 128, 3
B. 128, 4
C. 256, 3
D. 256, 4
Answer: D
Clarification: IC 74187 is organised as 256 * 4, hence it has 256 rows and 4 columns.
IC 74187 is of 1024 bits because it is organized as 256 * 4.
9. Which of the following IC is of 256 bit?
A. IC 74187
B. IC 74189
C. IC 74188
D. IC 74186
Answer: C
Clarification: IC 74188 is of 256 bits. Since, it is organised as 32 * 8 = 256. Thus, it has 32 rows and 8 columns.
10. Which IC is known as bipolar ROM?
A. IC 74187
B. IC 74189
C. IC 74188
D. IC 74186
Answer: C
Clarification: IC 74188 is known as bipolar ROM since it is made up of TTL logic.
11. How many address location a bipolar ROM has?
A. 16
B. 32
C. 64
D. 8
Answer: B
Clarification: Bipolar ROM means IC 74188 and it is organized as 32 * 8. Thus, it has 32 rows and 8 columns. So, it has 32 address locations and each of which has 8 bits of storage.
12. Which of the following is known as MOS static ROM?
A. TMS 45276
B. TMS 45278
C. TMS 45279
D. TMS 45275
Answer: A
Clarification: TMS 45276 is known as MOS static ROM and it is made up of MOSFETs.
13. TMS 45276 is of __________
A. 32 KB
B. 56 KB
C. 8 bits
D. 4 bytes
Answer: A
Clarification: TMS 45276 is known as MOS static ROM and it is made up of MOSFETs. In ROM, the data remains even when the power is switched off. TMS 45276 is of 32 KB.
14. Which of the following has the capability to store the highest bits of data?
A. TMS 45276
B. IC 74188
C. IC 74187
D. IC 74185
Answer: A
Clarification: TMS 45276 has the capability to store the highest bits of data because of 32768 * 8 = 12,62,144 organization.
15. What does CS mean in a chip?
A. Storing Capacity
B. Custom Select
C. Chip Select
D. Custom Storage
Answer: C
Clarification: CS means chip select and with the help of CS a chip is activated/deactivated. It is used for enabling or disabling the function of the chip.
16. ROMs are used to __________
A. Store bootstrap program
B. Character generation
C. Code conversion
D. All of the Mentioned
Answer: D
Clarification: ROM stands for Read Only Memory in which data is permanently stored, even when the power is turned off. It is used to store bootstrap program, character generation and code conversion.
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